NOW Supplements Quercetin with Bromelain

Quercetin nanoparticles reduce senescence

Based on 27 Researches

Karim A, Qaisar R, Suresh S, Jagal J, Rawas-Qalaji M. Nanoparticle-delivered quercetin exhibits enhanced efficacy in eliminating iron-overloaded senescent chondrocytes. Nanomedicine (Lond). 2024;19:2159. doi:10.1080/17435889.2024.2393074

We explored the effects of quercetin, a natural compound with potential benefits for treating osteoarthritis (OA), specifically focusing on its ability to target damaged chondrocytes, the cartilage cells that play a crucial role in joint health. In our study, we utilized specialized nanoparticles to increase the effectiveness of quercetin, overcoming its usual limitations related to absorption and bioavailability.

Our research involved subjecting human chondrocytes to conditions that mimic OA. Afterward, we treated them with either free quercetin or our quercetin-loaded nanoparticles (Q-NP). We found that the Q-NP not only allowed for better cellular absorption but also selectively induced apoptosis, or programmed cell death, in senescent chondrocytes. This is significant because eliminating these unhealthy cells could pave the way for healthier joint repair and function.

In addition to promoting cell death in the right cells, Q-NP led to an increase in oxidative stress and reduced key markers of cellular aging. We also noted that the treatment halted the cell cycle in cells that needed to be eliminated. Overall, our findings suggest that enhancing quercetin delivery through nanoparticles holds great promise for improving osteoarthritis outcomes by actively removing harmful senescent cells from joint tissues.

Remarkable transformation

Most Useful Review

101 people found this helpful

Quercetin review: I hated writing reviews, but I empathise with those with my condition. I had chronic arthritis in my left foot from an injury. The pain was unbearable and affected my sleep and focus. After various treatments, including tart cherry extract and meloxicam, I discovered quercetin, which significantly improved my condition. Eventually, I switched to NOW quercetin, which fully alleviated my arthritis discomfort.

Updated: Mar 2026

Allergies details

Quercetin may alleviate allergy symptoms

Based on 19 Researches

Yamada S, Shirai M, Inaba Y, Takara T. Effects of repeated oral intake of a quercetin-containing supplement on allergic reaction: a randomized, placebo-controlled, double-blind parallel-group study. Eur Rev Med Pharmacol Sci. 2022;26:4331. doi:10.26355/eurrev_202206_29072

We conducted a study involving 66 Japanese adults suffering from allergy symptoms, focusing on the potential of a quercetin-containing supplement. Participants took either the supplement or a placebo daily for four weeks.

Notable results showed that those taking quercetin experienced significant improvements in allergy-related symptoms such as eye itching, sneezing, and nasal discharge. Additionally, their overall quality of life received a boost.

While there were minor side effects, the findings suggest that quercetin might be an effective option for managing certain allergy symptoms.

Huge difference noted

Most Useful Review

281 people found this helpful

This is a miracle for my allergies! I suffer from chronic allergies year-round, yet this product has surpassed over 20 years of allergy shots and medications, all without side effects. While it’s not a complete cure, taking two capsules multiple times daily has made a significant positive impact. During peak allergy times, I can even take extra doses to alleviate symptoms throughout the day. I'd recommend it to anyone suffering from allergies, but do check with a doctor if you're on other medications.

Updated: Mar 2026

Ulcer details

Quercetin protects against gastric ulcers

Based on 4 Researches

Boonyong C, Angkhasirisap W, Kengkoom K, Jianmongkol S. Different protective capability of chlorogenic acid and quercetin against indomethacin-induced gastrointestinal ulceration. J Pharm Pharmacol. 2023;75:427. doi:10.1093/jpp/rgac098

We aimed to compare how quercetin and chlorogenic acid protect against ulcers caused by indomethacin in rats. The study revealed that while both substances offered some relief from intestinal ulcers, quercetin did not prevent gastric ulcers. Chlorogenic acid, interestingly, failed to enhance protective factors like prostaglandin E2, which is crucial for gastric health. This shows that while they share some benefits, quercetin has a unique edge when it comes to protecting against stomach ulcers.

Effective ulcer treatment

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742 people found this helpful

Excellent natural composition, indispensable for veins and blood vessels. This product effectively works on varicose veins and trophic ulcers. When doctors were unable to alleviate the pain of my mother’s trophic ulcer, I had to devise a treatment plan myself. I created a regimen that helped her recover in two weeks. The treatment included baneocin powder and solcoseryl ointment, along with internal supplements like Quercetin and Diosven. All these preparations worked synergistically and were significantly more affordable than pharmacy options. The regimen should be continued for at least two months, after which a maintenance dose can be taken. All beauty and health!

Updated: Apr 2026

Anxiety details

Isoquercitrin shows anxiety relief potential

Likely Very Effective

da Rocha YM, Marques LDS, do Nascimento GA, de Oliveira MRC, Moura LFWG, et al. Phytoceutical isoquercitrin and ethanolic extracts from pequi (Caryocar coriaceum Wittm) reverse alcohol withdrawal-induced anxiety in adult zebrafish (Danio rerio). Behav Brain Res. 2025;482:115439. doi:10.1016/j.bbr.2025.115439

We investigated how isoquercitrin, a major compound from the pequi fruit, may help reduce anxiety, especially during alcohol withdrawal. Our findings showed that both ethanolic extracts from the leaves and pulp of Caryocar coriaceum, as well as isoquercitrin itself, did not have a sedative effect on adult zebrafish, suggesting that they are safe options for potential anxiety treatment.

Throughout our experiments, we administered these treatments to the zebrafish and observed their behavior during periods of alcohol withdrawal. The study indicates that these extracts and isoquercitrin may interact with the GABAergic system, which is known for its role in anxiety regulation. The molecular docking studies we conducted confirmed that isoquercitrin could form a stable complex with GABA, offering insights into how it may provide anxiety relief.

In summary, our research suggests that isoquercitrin and pequi extracts have promising anxiolytic properties that could serve as alternative treatments for anxiety linked to alcohol withdrawal.

Minimises anxiety

Most Useful Review

It has been incredibly useful in minimising my anxiety and inflammation. For me, this is essential.

Updated: Apr 2025

Bloating details

Bloating significantly reduced

749 people found this helpful

What I got was better than what I was looking for. I purchased this seeking improved metabolism and weight maintenance. My digestion had been poor, I often experienced acid reflux, and my stomach appeared bloated. This supplement delivered results I never anticipated. After one day, I was able to suck my stomach in for the first time in years. While I can't confirm weight loss, I experience no bloating, great digestion, increased energy, and an overall sense of well-being thanks to this product. It surpassed my expectations.

Diabetes details

Quercetin aids diabetic heart health

Based on 27 Researches

Mustafa NH, Siti HN, Kamisah Y. Role of Quercetin in Diabetic Cardiomyopathy. Plants (Basel). 2024;14. doi:10.3390/plants14010025

We explored the emerging role of quercetin in managing diabetic cardiomyopathy, a serious complication linked to diabetes. The study highlights how quercetin, a natural compound found in many fruits and vegetables, shows promise in addressing various issues associated with this condition.

Through research, we uncovered that quercetin may aid in improving insulin signaling and reducing oxidative stress, both of which play significant roles in the progression of heart problems related to diabetes. Additionally, it appears to help combat inflammation and fibrosis, which are key factors in heart dysfunction.

We also noted that quercetin affects cellular processes like apoptosis and mitochondrial health, which are crucial for maintaining heart cell function. This multifaceted approach might be beneficial in preventing severe heart complications as diabetes progresses.

Overall, this review positions quercetin as a potential star in diabetes management, particularly for heart health, inviting further research and consideration for future therapeutic strategies.

Improved eyesight

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59 people found this helpful

As a diabetic, my eyesight began to blur, and my optometrist advised me that nothing could be done due to dilated blood vessels at the back of my eye. However, I read that Quercetin might assist with this issue by improving blood vessel function. Not wanting to lose my driving licence, I took a chance on some pills. It worked wonders! My doctor can't believe the difference; my eyesight is now 20/20, despite my diabetes and other conditions! Give it a go if your vision is blurry!

Updated: Mar 2026

Dizziness details

Ascovertin improves dizziness metrics

Plotnikov MB, Plotnikov DM, Alifirova VM, Aliev OI, Maslov MIu, et al. [Clinical efficacy of a novel hemorheological drug ascovertin in patients with vascular encephalopathy]. Zh Nevrol Psikhiatr Im S S Korsakova. 2004;104:33.

Our exploration focused on the effectiveness of a treatment called ascovertin in patients suffering from stages I and II of vascular encephalopathy, often linked to atherosclerosis. This treatment, comprised of flavonoid dihydroquercetin and ascorbic acid, was administered over a period of 21 days to a group of 21 patients.

In contrast, we had a comparison group of 10 patients who did not receive ascovertin. The results were promising, revealing that those who took ascovertin experienced significant relief from headaches, decreased vertigo, and less overall fatigue. Furthermore, cognitive functions showed noticeable improvement.

Alongside these benefits, we noted a reliable reduction in whole blood viscosity, suggesting better blood flow and health of blood cells. Specifically, ascovertin appeared to enhance cellular rheology, which means our study participants demonstrated improved flexibility of red blood cells, reduced clumping, and lower levels of harmful lipid peroxidation in both their red blood cells and blood plasma.

However, it’s important to mention that because quercetin was part of a combination treatment, isolating its specific effect on dizziness is challenging. Thus, while benefits were observed, the distinct role of quercetin is not definitively determined in this context.

Dizziness noted

Most Useful Review

2 people found this helpful

Be cautious of quercetin; dizziness is a noted side effect. After taking just one 400mg capsule with food, I felt dizzy. I’m giving it 4 stars, as it seems to be effective. I plan to try a lower dose next time.

Updated: Mar 2026

We conducted a double-blind, randomized placebo-controlled trial to evaluate how benesco™, a supplement containing quercetin, might help alleviate reflux symptoms. Our study involved 100 participants who were randomly assigned to receive either benesco™ or a placebo for six weeks.

The results showed that 39% of participants taking benesco™ experienced at least a 50% reduction in their reflux symptoms. However, this was not significantly different compared to the 47% success rate in the placebo group. Additionally, both groups reported a comparable number of reflux-free days and nights, offering no strong evidence that benesco™ is effective in treating reflux.

In conclusion, while we explored the potential of quercetin through benesco™, our findings indicate that it did not provide a significant benefit over the placebo. This suggests that those struggling with reflux might not find relief from this particular natural alternative.

Unexpected great results

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749 people found this helpful

What I received exceeded my expectations. I was not compensated for this review, just a regular person with issues I was unaware of. I purchased this hoping it would aid weight loss alongside resveratrol. My metabolism had slowed, my digestion was poor, and I faced acid reflux daily. Initially worried, I dismissed it as minor, thinking slippery elm would help. My stomach appeared as if I were pregnant, my energy was low, and my mood was down. I had tried other supplements that improved my energy and mood, but this one provided a fast, dramatic result. For the first time in years, I woke up able to suck in my stomach. No visible bloating and improved digestion, plus I feel energetic and well overall!

Updated: Mar 2026

Acanthosis Nigricans details

I am 30 years old and have experienced allergies since childhood, which developed into asthma and autoimmune diseases. After finding that pharmaceutical pills affected my liver and stomach negatively, I sought a natural alternative and chose quercetin. Over the past 16 years, I have found that quercetin has an antihistamine effect, reduces allergic reactions, and alleviates systemic inflammation and mucosal swelling. My previous allergy symptoms, such as itching of the throat and tongue, severe coughing, and rashes, have significantly diminished. I take it daily with food due to the presence of bromelain, which aids in digestion. To prepare for the pollen season, I begin taking quercetin in March. Wishing you good health!

441 people found this helpful

Back Pain details

I take one tablet 20 minutes before meals, twice a day. It's essential in the morning before breakfast and 20 minutes before lunch and dinner. I feel a surge of energy and noticed my knee pain has disappeared, along with help for allergies.

Brain Tumor details

Supports brain health

I introduced it to my husband as a cleaning aid, and he decided to try it too. Quercetin reduces oxidative processes in the body, possesses anti-inflammatory properties, and strengthens blood vessels. It protects brain cells against damage, reduces bad cholesterol, controls blood pressure, and combats viruses. Combined with vitamin C, it offers strong protection, particularly beneficial for brain tumour treatment.

I bought it for my mother, who is dealing with breast cancer. Quercetin is beneficial for cancer, as it helps prevent the growth of cancer cells. I'm hopeful for positive results.

Breast Cancer details

Bronchitis details

Quercetin shows promise for bronchitis

Based on 6 Researches

Zhu Z, Feng YD, Zou YL, Xiao YH, Wu JJ, et al. Integrating serum pharmacochemistry, network pharmacology and untargeted metabolomics strategies to reveal the material basis and mechanism of action of Feining keli in the treatment of chronic bronchitis. J Ethnopharmacol. 2024;335:118643. doi:10.1016/j.jep.2024.118643

We aimed to gather insights into how quercetin, a component of the herbal preparation Feining Keli (FNKL), may influence chronic bronchitis (CB) treatment. In our study, a rat model of CB was created using a combination of nasal drops of lipopolysaccharide (LPS) and smoking exposure. This model allowed us to evaluate the effectiveness of FNKL in a controlled environment, assessing behavioral changes, body mass, and lung health through various examinations.

Our findings indicated that FNKL has positive effects on CB, showing a potential benefit in alleviating symptoms. One crucial element we identified was quercetin-3-galactoside, which appears to play a significant role in FNKL's effectiveness. We discovered that quercetin might help by reducing inflammation and oxidative stress while regulating metabolic activity associated with bronchitis.

However, it’s important to note that while quercetin is active within the FNKL complex, our study does not isolate its effects from other ingredients. This means that while its importance is highlighted, we cannot conclusively determine quercetin’s standalone effectiveness in treating bronchitis.

Saved my asthma

Most Useful Review

119 people found this helpful

Quercetin and bromelain are potent natural ingredients that help manage allergic and inflammatory disorders like bronchitis. They alleviate asthma symptoms and assist in phlegm elimination. With arthritis, Raynaud's syndrome, and various allergies, Quercetin has been a lifesaver for me, and I take it regularly. Highly recommended!

Updated: Apr 2025

Celiac details

1 people found this helpful

This product is undoubtedly one of the most beneficial supplements I have tried. I take two tablets 15 minutes before meals, and they have done wonders. Following the jab, I developed intolerances to many foods, including gluten, dairy, and meat. Using this supplement along with digestive enzymes has significantly reduced my symptoms. Highly recommended.

Miracle dietary supplement

Chemotherapy details

29 people found this helpful

Convenient Large Bank, Lasts For A Long Time. In 2019, hematologists diagnosed my mother with multiple myeloma (progressive stage 2). She looked terrible; her hair fell out sharply and her teeth crumbled. I feared we would lose her. We started immunochemotherapy while giving her these dietary supplements, which I discovered through a VK group where myeloma patients shared survival tips. The journey has been tough, but now a little over a year later, my mother is finishing immunochemistry, and the doctors are optimistic. I am grateful to iherb for this miraculous product that aids her recovery. We tried another brand but were dissatisfied, particularly since it lacked bromelain, an anti-inflammatory that helps with her polyneuropathy.

Colitis details

Inflammation reduction

We purchased capsules for my daughter based on her gastroenterologist's recommendation, as she has been diagnosed with ulcerative Colitis. After taking two capsules daily for a month, the test results showed improvement and a decrease in inflammation. We will continue with this treatment. Highly recommended!

45 people found this helpful

Erectile Dysfunction details

Works brilliantly for allergies. I rarely write reviews on Amazon, but many helped me find the right dosage for my allergies, so I want to share my experience. This supplement is incredible. Before starting my Quercetin regimen, I took Allegra-D 180mg for severe allergies, which was adequate initially, but after three months, I experienced significant erectile dysfunction (ED). At 23, I had no reason for this. Alongside poor sleep and persistent fatigue, I decided to change my approach and researched Quercetin. After some trial and error, I found that 2 capsules each in the morning and afternoon worked well for me. Within three days of stopping Allegra and starting Quercetin, my allergy symptoms vanished, and my ED resolved. Furthermore, I feel invigorated, and my muscles have improved overall. I'm pleased I switched. This outperforms any other allergy treatment I've tried.

1 people found this helpful

Gastritis details

After use, the itching on my body subsided, my breathing improved, constipation lessened, and my gastritis seemed better as well.

Hypothyroidism details

Quercetin reverses hyperthyroid damage

Based on 7 Researches

Zhao P, Hu Z, Ma W, Zang L, Tian Z, et al. Quercetin alleviates hyperthyroidism-induced liver damage via Nrf2 Signaling pathway. Biofactors. 2020;46:608. doi:10.1002/biof.1626

We examined the effects of quercetin, a plant-derived flavonoid known for its antioxidant properties, in treating hyperthyroidism induced by L-thyroxine (LT4) in rats. Through a carefully designed study, we administered quercetin at different doses over two weeks to observe its impact on thyroid dysfunction.

The findings were striking. We noted that LT4 injections raised thyroid hormone levels while simultaneously increasing oxidative stress markers and decreasing antioxidant activity. However, when quercetin was introduced, it effectively reversed these adverse effects. Specifically, we saw improvements in liver function and oxidative stress markers, which suggests that quercetin held protective properties against the liver damage associated with hyperthyroidism.

Moreover, it became clear that these beneficial effects were tied to a specific signaling pathway known as Nrf2. When Nrf2 was inhibited in certain experimental rats, the positive impact of quercetin diminished, reinforcing the significance of this pathway in quercetin's action. Therefore, while our focus was on hyperthyroidism, the results imply that quercetin may hold potential therapeutic value in related conditions like hypothyroidism as well.

Improved energy levels

Most Useful Review

6 people found this helpful

I started taking this quercetin for my hypothyroidism after experiencing severe fatigue and a racing heart, yet my thyroid hormones were normal. I added magnesium and vitamin D to my regimen. Within a week, I began feeling more energetic and cheerful, and I stopped needing daytime naps. The magnesium course didn't help previously, but now I feel completely different. The combination of supplements may have made a difference. I'm pleased with the outcome and plan to keep taking it!

Updated: Apr 2025

Insomnia details

Improved sleep quality

122 people found this helpful

Great! We used quercetin to support the immune system, although from a different brand, and my mother's leg pain has significantly reduced. We decided to try bromelain this time, as it is beneficial for allergies. It's a miraculous remedy. After a two-week intake, my leg pain ceased, my sleep returned to normal (I had insomnia), and excessive sweating stopped. I will definitely order more and continue with the courses. Thank you for your attention. I've ordered two more cans. Colds are much better managed while taking it; it provides excellent support during colds as we navigate the red zone.

119 people found this helpful

Irritable Bowel Syndrome details

Quercetin and bromelain are powerful natural ingredients that alleviate allergic and inflammatory disorders, including irritable bowel syndrome. As someone with arthritis and allergies, Quercetin has been a salvation for me. I take it regularly and recommend it for its benefits.

6 people found this helpful

Kidney Stones details

Quercetin with Bromelain is excellent for the kidneys. I take it regularly as I aim to strengthen my kidneys and ward off kidney stones.

Knee Pain details

Knee pain relief from glucosamine

Kanzaki N, Ono Y, Shibata H, Moritani T. Glucosamine-containing supplement improves locomotor functions in subjects with knee pain: a randomized, double-blind, placebo-controlled study. Clin Interv Aging. 2015;10:1743. doi:10.2147/CIA.S93077

We conducted a randomized, double-blind study to assess how a glucosamine-containing supplement, which includes quercetin, impacts knee pain. Over 16 weeks, 100 Japanese participants were either given the supplement or a placebo.

While both groups showed some improvement in knee-joint functions, we observed no significant difference overall. However, for individuals with mild-to-severe knee pain, those taking the supplement gained greater knee-extensor strength and improved walking speed by week 16. Thus, quercetin may help enhance movement in selected knee pain cases.

Knee pain relief

Most Useful Review

441 people found this helpful

I take one tablet 20 minutes before meals, twice a day. It’s essential in the morning before breakfast, and before lunch and dinner as well. I feel a surge of strength, and it has helped with allergies. While taking this, my knee pain disappeared.

Updated: Apr 2025

Menopause details

Effective for allergies

4 people found this helpful

This is my fifth order, and I've been taking this product for over two years. It is certain that it effectively addresses allergies of unknown origins. I believe this was caused by menopause and a weakened immune system; in my mid-40s, I experienced severe hives. Despite trying numerous tests and dermatological treatments, it took about three years to improve. Once I learned about Quercetin, which I've been using for over two years, the symptoms haven't returned, and I feel well. There are many Quercetin products available, but this one works the best for me. When I feel unusual symptoms, I take it, and they are quickly alleviated. It may not suit everyone with hives or allergies, but it worked remarkably well for those with significant symptoms. Let's all stay healthy!

Effective recovery remedy

Pancreatitis details

This is a very good remedy for recovery after an exacerbation of chronic pancreatitis. It effectively helps prevent such exacerbations, especially when combined with a proper diet.

Stroke details

Quercetin shows neuroprotective potential

Based on 4 Researches

Mahyar M, Ghadirzadeh E, Nezhadnaderi P, Moayedi Z, Maboud P, et al. Neuroprotective effects of quercetin on hippocampal CA1 neurons following middle cerebral artery ischemia‒reperfusion in male rats: a behavioral, biochemical, and histological study. BMC Neurol. 2025;25:9. doi:10.1186/s12883-024-04017-z

We investigated the effects of quercetin on brain cells after strokes caused by middle cerebral artery occlusion (MCAO) in male rats. The study involved fifty-six rats divided into groups receiving different treatments, including a control group.

Quercetin, a natural compound known for its anti-inflammatory properties, showed promise in protecting CA1 neurons in the hippocampus—an area particularly vulnerable during a stroke. The results indicated that rats treated with lower doses of quercetin (5 and 10 mg/kg) had better neurological functions, improved motor skills, and showed remarkable preservation of brain tissue.

Additionally, quercetin treatment led to favorable changes in inflammation markers, specifically, a reduction in interleukin-1β (IL-1β) levels and an increase in interleukin-10 (IL-10) levels. However, the highest dosage of 20 mg/kg did not produce significant results compared to the control groups.

Overall, our findings suggest that quercetin may play a crucial role in neuroprotection following strokes, highlighting its potential as a therapeutic agent to mitigate brain injury.

Effective for recovery

Most Useful Review

A wonderful drug; my husband took it after a stroke. I recommend it for thinning the blood. The price and quality are satisfactory, and it's easy to take.

Updated: Apr 2025

Vertigo details

Quercetin-vitamin C combination reduces vertigo effectively

We examined whether ascovertin—a blend of dihydroquercetin (a plant flavonoid) and vitamin C—could help patients with early-stage vascular changes in the brain. Over 21 days, 21 patients received ascovertin while 10 similar patients received no treatment.

The results were encouraging. Ascovertin reduced vertigo, headaches, and tiredness while sharpening mental clarity. We also observed meaningful improvements in blood flow: red blood cells became more flexible, clumping decreased, and markers of cellular damage dropped. The untreated group showed no such improvements.

These findings suggest quercetin-based formulas may offer real benefits for brain blood flow problems.

Effective treatment

Most Useful Review

Helps my vertigo; I take this twice a day. It usually keeps the vertigo at bay, but if it resurfaces, I increase my dose to two capsules twice daily, which often resolves it immediately.

Updated: Apr 2026

Angina details

Heart health improvement

6 people found this helpful

Good, I took it because it is helpful in promoting and enhancing heart health, as well as reducing high blood pressure and the severity of angina attacks. I would recommend it.

Helpful for vascular health

Candidiasis details

This has been useful for vascular strengthening and as part of my anti-Candidiasis protocol. I have seen positive results.

Conjunctivitis details

Quercetin helps alleviate allergy symptoms

We conducted a 4-week study to assess how a quercetin-containing supplement could help relieve allergy symptoms, particularly for those suffering from eye and nose discomfort.

In a randomized, placebo-controlled setup, 66 participants ingested either 200 mg of quercetin or a placebo daily.

We found that those taking quercetin experienced notable improvements in symptoms like eye itching and sneezing, leading to a better overall quality of life. Minor side effects were reported, but they were not significant enough to detract from the benefits observed.

Alleviates multiple ailments

Most Useful Review

11 people found this helpful

Amazing! This product has helped with various conditions including eczema and conjunctivitis, significantly alleviating allergic diseases throughout my body. Combining it with zinc, L-glutamine, and glucosamine & chondroitin appears to yield near-perfect results. I feel more liberated from chronic pain!

Updated: Mar 2026

Indigestion details

10 people found this helpful

Love this stuff! It’s what my family relies on for allergies. Together with vitamin C, it’s effective. We typically need just one capsule twice daily and double it during severe allergy attacks. It also works wonderfully for inflammation and indigestion. I would recommend it as a staple in anyone's home.

Quercetin shows promise for migraines

Migraine details

Foudah AI, Devi S, Alqarni MH, Alam A, Salkini MA, et al. Quercetin Attenuates Nitroglycerin-Induced Migraine Headaches by Inhibiting Oxidative Stress and Inflammatory Mediators. Nutrients. 2022;14. doi:10.3390/nu14224871

We explored how quercetin might alleviate migraine symptoms caused by nitroglycerin in rats. Over a week, we administered quercetin and examined its impact on behavior after inducing migraine pain.

The results were promising; quercetin significantly improved behavioral responses linked to migraine pain, showing a decrease in the severity of symptoms.

Its effectiveness appears to stem from quercetin's antioxidant and anti-inflammatory properties, suggesting it could be a helpful treatment for migraine relief.

Migraine-free

Most Useful Review

11 people found this helpful

Has so many benefits. After trying this again for my allergies, I found it helped my migraines as well. I managed to reduce my dosage, which eliminated the reflux, and I haven't had a migraine since resuming it.

Updated: Mar 2026

Mild Cognitive Impairment details

Blood pressure improvement

35 people found this helpful

Since commencing treatment, my blood pressure has decreased, and I feel my blood vessels have softened. A professor at a public university is researching its potential effectiveness for dementia. I am hopeful that with softer blood vessels, cerebral blood flow will enhance, thereby acting as a preventative measure against dementia. I fear dementia more than viruses like Corona, especially as I aim to live for many more years. (Lol)

Rosacea details

Significant improvement

I have rosacea affecting the vessels on my face, and the beautician advised me to take quercetin with bromelain as a course. Over the past month, my skin condition has improved significantly; there are nearly no visible vessels, and the blood vessels appear strengthened. I took another course. It’s excellent and it truly works :)

Quercetin shows potential benefits

Sore Throat details

Chaniad P, Tewtrakul S, Sudsai T, Langyanai S, Kaewdana K. Anti-inflammatory, wound healing and antioxidant potential of compounds from Dioscorea bulbifera L. bulbils. PLoS One. 2020;15:e0243632. doi:10.1371/journal.pone.0243632

We delved into the potential healing properties of Dioscorea bulbifera, a plant known in traditional medicine for treating inflammation and wounds. Various crude extracts and purified compounds were tested for their effects on wound healing, inflammation, and antioxidant activities.

Among the compounds, quercetin showed promising results as an anti-inflammatory agent, significantly reducing nitric oxide production. However, while quercetin and other compounds supported cell proliferation and migration, they did not conclusively establish their effectiveness for wound healing specifically.

This research reinforces the traditional use of Dioscorea bulbifera, providing insights for future studies on its medicinal properties.

Coughing relief

Most Useful Review

15 people found this helpful

Since taking this product, my coughing, sore throat, and swollen eyes have resolved. Additionally, my nighttime urination has improved. It’s a fantastic supplement, allowing me to sleep soundly without disturbances. I'll definitely purchase it again.

Updated: Apr 2025

Tinnitus details

After suffering from tinnitus, I noticed it flaring up when I felt down. Since taking bromelain regularly, the symptoms have significantly diminished.

Urinary Tract Infection details

This dietary supplement has transformed my life. The combination of quercetin and bromelain is ideal for absorption. I take it for painful bladder syndrome, resulting in repeated cystitis without bacteria. Quercetin's anti-inflammatory properties have removed my pain after just three weeks of use, and I'm thrilled with the results.

Adenoiditis details

Effective for allergies

Quercetin has an antihistamine effect, reduces allergic reactions, and lessens systemic inflammation. My allergy symptoms have diminished significantly; previously, I would experience throat and tongue itching, a strong cough, and rashes, but now these reactions have disappeared. I take it daily with food, as it also aids digestion, and begin taking it in March to prepare for the pollen season.

Chest Pain details

Indispensable! The quercetin package arrived promptly. I fell ill soon after and took two capsules twice daily. It really helped ease my lung discomfort and overall pain. My sister hasn't been sick all winter thanks to quercetin, making it essential in our household!

Eczema details

Quercetin shows promise for eczema

Liu C, Cheng X, Wu Y, Xu W, Xia H, et al. Antioxidant Activity of Quercetin-Containing Liposomes-in-Gel and Its Effect on Prevention and Treatment of Cutaneous Eczema. Pharmaceuticals (Basel). 2023;16. doi:10.3390/ph16081184

We investigated the potential of quercetin, a natural compound known for its antioxidant properties, in treating cutaneous eczema. Specifically, we prepared a special formulation of quercetin contained within liposomes and mixed it into a gel. This method aimed to enhance the compound's effectiveness in promoting skin healing.

Our findings revealed that this quercetin-infused gel not only demonstrated significant antioxidant activity but also improved skin conditions in mice suffering from eczema. The application of this formulation led to noteworthy reductions in various symptoms associated with the skin condition, such as inflammation and epidermal peeling.

In comparison to a commonly used eczema treatment, we found that the quercetin formulation outperformed the commercially available steroid cream in reducing malondialdehyde levels, a marker of oxidative stress in the body. These results suggest that quercetin-containing liposomes hold promise as a novel approach for preventing and treating cutaneous eczema.

Must-try remedy

Most Useful Review

This is my holy grail. A must-try for anyone suffering from eczema; you will thank me later.

Updated: Mar 2026

Frozen Shoulder details

We included this dietary supplement during replacement periods; it has a specific smell from bromelain concentrate and quercetin, which becomes accustomed to over time. I took it for shoulder stretching alongside a natural ointment. Surprisingly, I felt relief by the fifth day and complete recovery after two weeks. Quercetin provides potent antioxidant effects and regulates apoptosis, which I found beneficial.

Hypertension details

Good for family health

I have been using this product for several months in cycles of two months with breaks. Quercetin greatly affects overall well-being. I shared it with my mother and sister, both suffering from periodic blood hypertension. After a month of regular intake, they said their blood pressure issues significantly improved. I personally don’t have that issue, but I take quercetin for its anti-aging and anti-inflammatory effects.

As someone with hyperthyroidism, I've taken quercetin and apple pectin for several years, and now my index is normal, eliminating my need for medication.

Hyperthyroidism details

Multiple Sclerosis details

Reduced allergy symptoms

Quercetin has significantly reduced my allergy symptoms, including sneezing and coughing. I have multiple pollen allergies, but since taking 3 to 6 capsules daily, my symptoms have improved by at least 70%. Although I still contend with other airborne allergies, Quercetin makes it easier to manage my reactions and triggers.

Improves multiple health aspects

Osteoporosis details

Quercetin enhances kidney function, promotes heart health, prevents cancer, combats ageing, treats osteoporosis of the bones, extends life, and delays the onset of old age. I take it with resveratrol and coenzyme as antioxidants.

140 people found this helpful

Rash details

Excellent! I received quercetin as prescribed by my doctor for allergic rashes on my face and body. I was advised to take 1 capsule 30 minutes before the first meal and another before dinner. Besides addressing rashes, quercetin improves immune and lung function. The order was quickly processed, and everything arrived intact. Please consider rating my review positively. Wishing you good health!

Alzheimer details

Quercetin as potential Alzheimer's treatment

Shukla R, Mishra K, Singh S. Exploring therapeutic potential of bioactive compounds against Alzheimer's and Parkinson's diseases. 3 Biotech. 2025;15:61. doi:10.1007/s13205-025-04224-6

We looked into how quercetin, a bioactive component of an ayurvedic herb, could help in treating Alzheimer's disease. The study proposed a deep dive into various therapeutic targets associated with Alzheimer's, including toxic proteins like amyloid beta and tau.

Our findings from the docking analysis indicated that quercetin shows a strong binding affinity to these targets. This suggests that it could potentially intervene in the processes that contribute to the disease. Further experiments demonstrated that quercetin effectively inhibits the production of alpha-synuclein, a protein that plays a role in neurodegeneration.

While quercetin appeared promising, we also explored other compounds like Luteolin, which showed potential in preventing Alzheimer's disease by alleviating effects related to damaging treatments. The study highlights the need for more comprehensive testing, particularly in live models, to fully understand quercetin's effectiveness in treating Alzheimer’s and its potential role in prevention.

Overall, the evidence points to quercetin being a valuable candidate in our quest for effective Alzheimer's treatments, although further validation is essential.

7.5

Positive for Alzheimer's

Most Useful Review

Good product! I started using it during the pandemic and wish to continue as it has numerous beneficial effects. It seems to have a positive impact on Alzheimer’s as well.

Updated: Apr 2025

Cough details

Quercetin reduces chronic cough effectively

Guo CR, Zhang ZZ, Zhou X, Sun MY, Li TT, et al. Chronic cough relief by allosteric modulation of P2X3 without taste disturbance. Nat Commun. 2023;14:5844. doi:10.1038/s41467-023-41495-0

We uncovered how quercetin, alongside a specialized compound called PSFL2915, affects chronic cough by interacting with a specific part of a receptor known as P2X3.

Our tests showed that quercetin could effectively reduce coughing in male mice and guinea pigs without causing taste disturbances—a drawback seen with other similar medications.

This suggests that quercetin could be a promising alternative to existing treatments for chronic cough, offering a potential new avenue for relief.

7.5

Significantly improved cough

Most Useful Review

56 people found this helpful

Last November, during a two-week vacation to Tahiti, I developed a persistent "productive" cough. Upon returning home, I caught a cold and a mild flu, and the cough lingered. After months of suffering, I discovered that my cough might be due to inflammation. I ordered a supplement linked to Bromelain and Quercetin and took it twice daily for a week. My cough is now significantly better, and I’m happy it’s positively impacted my health. I'll definitely discuss this with my doctor to explore any underlying issues.

Updated: Apr 2025

Floaters details

5 people found this helpful

It's been two months since I started taking it for floaters. I’ve noticed that the number of floaters has decreased from before. However, since they still appear occasionally, I will continue taking it.

V. divergens extract shows promise

Flu details

Corrêa MFP, Ventura TLB, Muzitano MF, Dos Anjos da Cruz E, Bergonzi MC, et al. Suppressive effects of Vochysia divergens aqueous leaf extract and its 5-methoxyflavone on murine macrophages and lymphocytes. J Ethnopharmacol. 2018;221:77. doi:10.1016/j.jep.2018.04.007

We aimed to explore the health benefits of Vochysia divergens, known for its traditional use in treating asthma and flu. The study evaluated how its aqueous leaf extract impacts inflammatory markers in macrophages and lymphocytes.

Through various methods, we discovered that the extract and a specific flavonoid can significantly reduce pro-inflammatory markers. This supports the local tradition of using Cambará tea for respiratory issues, highlighting its potential medicinal properties.

Reduced flu symptoms

Most Useful Review

120 people found this helpful

For any symptoms of COVID or a common flu, this works brilliantly! Although I’ve only been taking it for a week, I’ve noticed a significant difference. Working in hospitality, I'm often exposed to many people. When I began to experience slight flu symptoms, I discovered this supplement and was keen to try it. I have a tendency for a blocked nose in the mornings, and to my amazement, taking this twice daily has eliminated my flu symptoms and allowed me to breathe freely upon waking! Initially sceptical, I can now confirm it's worth a go! Stay healthy!

Updated: Apr 2025

Heart Attack details

Quercetin shows potential for heart protection

Based on 16 Researches

Kozhukhov S, Parkhomenko A, Lutay Y, Dovganych N. Impact of quercetin in patients with myocardial infarction. A multicenter, randomized, and open-label pilot study. Hellenic J Cardiol. 2024;76:68. doi:10.1016/j.hjc.2023.08.004

We investigated the addition of quercetin to standard treatment in patients experiencing their first heart attack. In this multicenter study with 143 participants, quercetin was administered during the critical early hours of treatment.

The results showed a significant reduction in heart tissue damage compared to those who only received standard therapy. Specifically, fewer patients in the quercetin group experienced internal bleeding in the heart muscle.

While the initial findings are promising, additional studies are needed to confirm these benefits.

Supports heart health

Most Useful Review

5 people found this helpful

I have been taking quercetin since September 2020. I use this drug alongside Quercetin from Paradise Herbs for my varicose veins, preparing for surgery. My recent ultrasound showed calm vessels without inflammation, and my heart scan was normal. After four cycles of chemotherapy, I believe this supplement, along with others, helped reduce my inflammation and support my heart. Be healthy and enjoy life!

Updated: Apr 2025

High Cholesterol details

Quercetin lowers cholesterol effectively

Based on 16 Researches

Kang HJ, Pichiah PBT, Abinaya RV, Sohn HS, Cha YS. Hypocholesterolemic effect of quercetin-rich onion peel extract in C57BL/6J mice fed with high cholesterol diet. Food Sci Biotechnol. 2016;25:855. doi:10.1007/s10068-016-0141-4

We investigated how onion peel extract, packed with quercetin, affects high cholesterol levels in mice. Divided into four groups, the mice were fed different diets for 12 weeks.

Those receiving the higher dose of onion peel extract showed significant reductions in serum and liver cholesterol levels, along with improved liver health markers compared to the group on a high cholesterol diet alone.

This suggests that quercetin may lower cholesterol by increasing its excretion.

Supports immunity

Most Useful Review

34 people found this helpful

I found this supplement effective for my weak immunity and blood vessel issues. After using it, I had a significant improvement in health. Quercetin is a strong antioxidant that helps prevent allergies and strengthens blood vessels, making it an excellent choice. I highly recommend it for anyone needing similar support!

Updated: Apr 2025

Hives details

Life-changing solution

17 people found this helpful

I'm very grateful this product acts as a Benadryl replacement for my wife. She has random allergic reactions, believed to be hives, causing swelling of her lips and eyes. The Quercetin/Bromelain blend has been a lifesaver. Previously, she took Benadryl daily, which left her foggy and sleepy. We initially bought a pricey brand but switched to Now Foods for its potency and affordability. She can’t swallow pills, but these capsules can be mixed with applesauce. Within a couple of days, her reactions lessened significantly, and she hasn’t experienced any swollen lips since.

Influenza details

I highly recommend it to everyone; it strengthens the body's immunity against corona and influenza.

Healthy weight management

Obesity details

This supplement has assisted in managing a healthy weight and lowered the risk of obesity-related health issues. It is particularly useful for those wanting to control their weight or who are at risk for obesity-related health problems.

Psoriasis details

Quercetin shows promise for psoriasis

Ma J, Wang F, Wang L, Wang Y, Wu D, et al. Inhibition of PI3K/AKT/GLUT1 Signaling Pathway by Quercetin in the Treatment of Psoriasis. Front Biosci (Landmark Ed). 2025;30:26884. doi:10.31083/FBL26884

We set out to explore the therapeutic impact of quercetin on psoriasis and how it interacts with a specific signaling pathway known as PI3K/AKT/GLUT1, which plays a critical role in inflammation and immune responses. Using a mouse model of psoriasis induced by imiquimod, we carefully assessed the effects of quercetin on skin lesions and associated histopathological features.

To deepen our understanding, we evaluated human keratinocyte cells (HaCaT) to see how quercetin influenced cell proliferation and apoptosis. Our findings indicated that quercetin appeared helpful in reducing the symptoms of psoriasis and that it had a notable effect on signaling through the PI3K/AKT/GLUT1 pathway.

Overall, the results suggest that quercetin could be a promising candidate for treating psoriasis, marking a step forward in potential therapeutic options. As we continue to investigate this area, these insights may pave the way for more targeted treatments in the future.

Psoriasis cleared unexpectedly

Most Useful Review

6 people found this helpful

My psoriasis suddenly disappeared. This is my second purchase. I had psoriasis and tried it, but it vanished unexpectedly. I cannot attribute this entirely to the product, as I did not change anything else. The expiration date is also good and long.

Updated: Apr 2025

Rheumatoid Arthritis details

After eating, I checked the rheumatoid arthritis index and was delighted to find good results, encouraging me to keep using it.

4 people found this helpful

Tonsillitis details

This is a fantastic option for throat and nose issues. I have chronic rhinitis and tonsillitis, constantly visiting the ENT. I chanced upon this drug on Ayherbe and decided to try it. I take one capsule three times daily with food. After about two weeks, I noticed results; the ENT has not been needed for three months. So judge for yourself whether the drug is effective!

Updated: Apr 2026

Whooping Cough details

10 people found this helpful

Quartztin was prescribed by my doctor for my two-month battle with whooping cough. It worked quickly; within two days, I was sleeping soundly and my cough had vanished completely in a week. I even started giving it to my daughter, and by day three, her cough was gone too.

Asthma details

Quercetin alleviates asthma symptoms

Based on 10 Researches

Sun B, Cai F, Yu L, An R, Wei B, et al. Quercetin inhibits ferroptosis through the SIRT1/Nrf2/HO-1 signaling pathway and alleviates asthma disease. Transl Pediatr. 2024;13:1747. doi:10.21037/tp-24-193

We explored how quercetin, a natural compound found in fruits and vegetables, can impact asthma symptoms. Using an ovalbumin-induced mouse model of asthma, we aimed to uncover whether quercetin can help inhibit a process known as ferroptosis, potentially offering a new therapeutic approach for asthma sufferers.

Our findings showed that quercetin effectively reduced inflammation in the asthmatic mice. Specifically, it lowered levels of inflammatory factors such as IL-4, IL-5, and IL-13—substances typically elevated during an asthma attack. Notably, we also observed that quercetin increased the levels of superoxide dismutase, an important antioxidant, while decreasing malondialdehyde and ferric ions that are associated with oxidative stress.

Additionally, quercetin appeared to boost the expression of key proteins involved in defending against oxidative stress, specifically SIRT1, Nrf2, and HO-1. This suggests that quercetin not only helps combat inflammation but may also protect against cellular damage within the lungs. Overall, our study indicates that quercetin holds promise as a beneficial treatment for asthma by addressing both inflammatory and oxidative stress pathways.

7.5

Reduced symptoms

Most Useful Review

98 people found this helpful

After taking Quercetin with Bromelain for 14 months, I have seen significant improvements in my asthma and allergies. I've tried numerous medications, but overcoming my struggles took time. Initially, I noticed small changes like reduced mucus and sneezing, and eventually, I experienced an entire year with minimal symptoms. I haven't used prescribed medication for over seven months, and my husband is now eager to try it too! It has dramatically changed my life, and I only continue with the Quercetin and my allergy shots.

Updated: Mar 2026

Chronic Cough details

Quercetin's effect on chronic cough

Guo CR, Zhang ZZ, Zhou X, Sun MY, Li TT, et al. Chronic cough relief by allosteric modulation of P2X3 without taste disturbance. Nat Commun. 2023;14:5844. doi:10.1038/s41467-023-41495-0

We examined how quercetin, a natural compound, can help alleviate chronic cough by targeting P2X3 receptors, which are involved in cough reflexes. The study involved testing its effects on male mice and guinea pigs.

Results showed that quercetin effectively modulated these receptors without causing adverse taste effects, unlike other drugs like gefapixant. This potential opens up new avenues for treating chronic cough without unpleasant side effects.

Effective against allergies

Most Useful Review

67 people found this helpful

An excellent tool! After three months, I can properly evaluate this drug. I used it for chronic cough due to allergies, particularly ragweed. My son has chronic obstructive bronchitis and found it very helpful as an expectorant. We survived allergy season and are now using it for immunity alongside vitamins C and D. We feel great!

Updated: Apr 2025

Eye Infection details

4 people found this helpful

After discovering it by chance, I ordered it and tried it. I observed a clear effect, so I recommended it to my family. They all experienced excellent results with rhinitis, and I am consistently using it. It appears to have decreased my symptoms significantly. My rhinitis has persisted for a long time, often leading to allergic conjunctivitis, but I hardly feel any symptoms of allergic conjunctivitis now.

11 people found this helpful

Herpes details

Recently, I had herpes in my mouth, so I started taking Quercetin orally—two capsules three times daily. I also mixed one capsule with water and applied it directly to the wounds. The outcomes from this method were impressive: the wounds healed quickly. Additionally, I used Quercetin for Covid and respiratory infections. The packaging is good, and the product quality is excellent.

25 people found this helpful

Lung Cancer details

I chose this quercetin product as it was your number one bestseller. I am using this flavonoid to combat my advanced prostate cancer. The pain in my legs and feet is definitely lessening, which is wonderful. My oncology professor originally predicted I would not survive past early 2020. I’m very pleased with the results from taking this product.

Bacterial Infection details

Family immunity boost

Throughout the quarantine, my family took this supplement while being surrounded by infection, and remarkably, none of us fell ill. It's been essential for us during this time.

Cold Sores details

Herbal treatment effective for cold sores

Likely Very Effective

Polansky H, Javaherian A, Itzkovitz E. Clinical Trial of Herbal Treatment Gene-Eden-VIR/Novirin in Oral Herpes. J Evid Based Integr Med. 2018;23:2515690X18806269. doi:10.1177/2515690X18806269

We investigated the effectiveness of the herbal treatment Gene-Eden-VIR/Novirin for managing cold sores. Our study involved a retrospective chart review with 68 participants who took 1 to 4 capsules daily over varying periods.

The results were promising, showing that 89.3% of participants benefited. The treatment significantly reduced both the number and duration of outbreaks compared to control groups. Gene-Eden-VIR/Novirin also outperformed traditional medications like acyclovir and valacyclovir without any side effects.

We strongly suggest considering Gene-Eden-VIR/Novirin as a preventive option for oral herpes.

Effective for allergies

Most Useful Review

5 people found this helpful

A very good remedy for allergies. It effectively helps me manage cold allergies. I take one capsule at the onset of cold weather.

Updated: Apr 2025

Cold details

Quercetin boosts grape cold resistance

Liu G, Zhang Z, Tian Y, Yang J, Xu X, et al. VvbZIP22 regulates quercetin synthesis to enhances cold resistance in grape. Plant Sci. 2025;350:112293. doi:10.1016/j.plantsci.2024.112293

We observed that quercetin, a powerful antioxidant, plays a significant role in helping grapes withstand cold temperatures. In our study, we found that grapes exposed to low temperatures accumulate more quercetin, which in turn enhances their cold resistance.

By applying exogenous quercetin, we noted a marked improvement in the grapes' ability to endure low-temperature stress. Our research revealed that a key gene, VvFLS1, responsible for quercetin synthesis is upregulated when grapes experience cold conditions.

We also discovered that VvbZIP22, a protein that binds to the VvFLS1 promoter, is crucial for mediating this process. When we overexpressed VvbZIP22 in grapes, it resulted in higher levels of quercetin and improved cold resistance, further confirming its pivotal role in the plant's adaptation to harsh environments.

Through these findings, we highlighted the importance of quercetin in enhancing grape survival during cold spells, showcasing a vital link between plant biology and climate resilience.

Good health elixir

Most Useful Review

193 people found this helpful

Quercetin+Bromelain has significantly improved my health. After suffering from allergies and colds for years, I've not been ill in years! I attribute my strong health to this supplement.

Updated: Apr 2025

Food Poisoning details

1 people found this helpful

This product is undoubtedly one of the best supplements I’ve tried. I take two tablets 15 minutes before meals, and they have worked wonders. Since receiving my jab, I developed intolerances to various foods. However, since using this supplement with digestive enzymes, most of my symptoms have vanished. Highly recommended for managing food poisoning discomfort.

30 people found this helpful

Liver Disease details

I've repurchased quercetin with bromelain for its enhanced anti-inflammatory properties. Quercetin improves blood circulation and helps alleviate allergy symptoms, while bromelain aids digestion. Together, they support overall wellness, prevent lifestyle-related diseases, and enhance immunity. However, care should be taken to avoid overdosing, as effects are confirmed in healthy individuals only.

Cardiovascular Disease details

Quercetin reduces cardiac fibrosis

Based on 14 Researches

Lin DW, Jiang YW, Wu C, Zhang H, Li YZ, et al. Quercetin Alleviates Cardiac Fibrosis via Regulating the SIRT3 Signaling Pathway. Cardiovasc Drugs Ther. 2024. doi:10.1007/s10557-024-07658-x

We explored the effects of quercetin on cardiac fibrosis, a major concern in cardiovascular diseases. Using an experiment on mice, we administered quercetin after inducing cardiac stress and assessed its impact on heart function and fibrosis. Our findings showed that quercetin significantly reduced cardiac fibrosis and helped reverse cell proliferation caused by stress hormones. This protective effect was linked to its regulation of the SIRT3 signaling pathway. Overall, quercetin presents a promising avenue for addressing heart fibrosis.

Cardiovascular support

Most Useful Review

9 people found this helpful

I ordered this long ago but only recently tried it. My endocrinologist suggested bromelain for better food absorption and anti-inflammatory activity. Quercetin strengthens blood vessels and supports the cardiovascular system. I take one to two capsules twice daily with food, and the jar lasts long enough for a complete course.

Updated: Apr 2025

Common Cold details

Quercetin reduces rhinovirus effects

Based on 7 Researches

Ganesan S, Faris AN, Comstock AT, Wang Q, Nanua S, et al. Quercetin inhibits rhinovirus replication in vitro and in vivo. Antiviral Res. 2012;94:258. doi:10.1016/j.antiviral.2012.03.005

We investigated whether quercetin, a natural plant compound, could help combat common cold caused by rhinovirus (RV). In our study, quercetin reduced RV replication and inflammation in airway cells both in laboratory settings and in mice. When given before or after infection, quercetin limited the virus's ability to replicate and decreased harmful immune responses.

While our findings are promising, indicating that quercetin acts at various points in the virus's lifecycle, we recognize the need for further research to solidify its effectiveness in treating or preventing common colds.

Reliable defender

Most Useful Review

I've been susceptible to colds, often falling ill. Since taking quercetin, though, my sore throat has become rare, and it has proven a reliable defender during the epidemic.

Updated: Mar 2026

Constipation details

Quercetin improves gastrointestinal function

Kim JE, Lee MR, Park JJ, Choi JY, Song BR, et al. Quercetin promotes gastrointestinal motility and mucin secretion in loperamide-induced constipation of SD rats through regulation of the mAChRs downstream signal. Pharm Biol. 2018;56:309. doi:10.1080/13880209.2018.1474932

We explored the effects of quercetin (QCT) on constipation induced by loperamide in rats. The study involved multiple treatment groups receiving different doses of QCT after the constipation model was established.

After treatment, we found significant improvements in gastrointestinal motility and stool frequency in the rats that received QCT compared to those who didn’t.

Moreover, we observed that QCT activates certain messenger pathways in the gut, highlighting its potential as a valuable option for managing chronic constipation.

Relieved constipation

Most Useful Review

11 people found this helpful

Taking 50 mg of chelated iron significantly eased my stubborn constipation. Combined with probiotics, it helped promote regularity. I initially took quercetin before lunch to improve my gut health, and I recommend it for anyone struggling with iron-related constipation.

Updated: Apr 2025

Weight Loss details

Absolutely perfect! I purchased it for weight loss and found that I truly began to eat less than usual!

Positive treatment outcome

Prostate Cancer details

9 people found this helpful

My spouse has been using this quercetin for over a year as part of her breast cancer treatment, guided by Dr. Belkin's recommendations. Alongside Curcumin 95, we believe it contributes positively to her treatment progress.

14 people found this helpful

Bone Pain details

I suffer from recurring gout, and my last bout affected my right hand. After taking quercetin for three days, the swelling and pain have significantly reduced, and I have regained full use of my hand.

Cancer details

Quercetin's role against colorectal cancer

Based on 32 Researches

Han S, Yi YW, Kim H, Lee MY, Choi H, et al. Structure-activity relationship analysis of mono-methylated quercetins by comprehensive MS/MS analysis and anti-proliferative efficacy in human colorectal cancer cells. Biomed Pharmacother. 2025;184:117930. doi:10.1016/j.biopha.2025.117930

We aimed to understand how quercetin and its derivatives, especially mono-methylated quercetins (MQs), might help in treating colorectal cancer. Using advanced techniques like tandem mass spectrometry, we identified specific structural features of these flavonoids that could enhance their anti-cancer activities.

Our findings showed that methylation at specific positions on the quercetin molecule significantly improved its ability to fight cancer cells. Notably, 3-O-methylquercetin and 4'-O-methylquercetin were particularly effective. These compounds caused cancer cells to stop dividing and triggered programmed cell death, also known as apoptosis.

We observed that these MQs worked through several mechanisms, such as inducing oxidative stress, disrupting mitochondrial function, and inactivating cancer-related signaling pathways—all while being non-toxic to normal human colon cells. This makes them promising candidates for cancer therapy, especially for patients with colorectal cancer.

Ultimately, our research revealed that small modifications in flavonoid structures could lead to significant improvements in their anti-cancer effectiveness, providing a path for developing targeted treatments for colorectal cancer.

7.5

Improved wellbeing

Most Useful Review

664 people found this helpful

I have multiple sclerosis, but this supplement has been stunningly effective. At 52, my health has improved significantly. Quercetin, a powerful antioxidant, along with bromelain, is helping my treatment against cancer. I only relied on these supplements and avoided antibiotics throughout my recovery. I consistently take them for ongoing health and quality of life.

Updated: Apr 2025

Acne details

Quercetin shows promise against acne

Based on 6 Researches

Lim HJ, Kang SH, Song YJ, Jeon YD, Jin JS. Inhibitory Effect of Quercetin on Propionibacterium acnes-induced Skin Inflammation. Int Immunopharmacol. 2021;96:107557. doi:10.1016/j.intimp.2021.107557

We examined how quercetin, a popular plant-based antioxidant, affects skin inflammation caused by the acne-causing bacteria Propionibacterium acnes. Through both laboratory and mouse studies, we found that quercetin significantly decreased inflammation-related proteins and cell responses triggered by this bacteria. When tested on mice, quercetin reduced swelling and redness at the injection site. These findings suggest that quercetin could serve as a beneficial treatment option for acne-related inflammation, opening doors for its use in skin care products and therapies.

Minor acne impact

Most Useful Review

19 people found this helpful

The quercetin ingredient may be beneficial for inflammation. My husband, who suffers from rhinitis and dust allergy, experienced prolonged sneezing, stuffiness, and sleeplessness after ineffective Korean medicine. He has acne-prone skin, and even the slightly acidic cleanser and skincare products specifically for acne didn't seem to help. I haven't observed significant acne issues myself, perhaps influenced by the quercetin.

Updated: Apr 2026

Heart Disease details