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Life Extension Optimized Quercetin
Supplement Facts
Serving Size:  1 Vegetarian Capsule
Amount Per Serving
%DV
Vitamin C (from ascorbic acid, camu-camu berry extract)
30 mg
33%
Quercetin (as quercetin dihydrate)
250 mg
**
Optimized Food Blend[onion (bulb) (extracts), bitter orange bioflavonoids (peel and fruit), apple (fruit)
220 mg
**
Camu-camu extract (wildcrafted berry)
50 mg
**

The product is found useful for the following medical conditions

Blood Clot details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 12 Reviews
8.8
9.5
Supports blood vessels
Most Useful Review
The pandemic prompted me to explore various supplements to boost my immune system against the new virus. I discovered quercetin, an antioxidant that combats oxidative stress, prevents cytokine storms, and strengthens blood vessel walls. It improves microcirculation, aids normal blood clotting, and prevents blood clots, particularly in lung vessels. Additionally, it maintains proper functioning of the bronchi and lungs while exhibiting antiviral activity. Quercetin also facilitates zinc, a potent immune booster, to enter cells.

Chronic Fatigue Syndrome details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 4 Reviews
8.8
9.5
Increased energy noted
Most Useful Review
I have experienced increased energy and strength. After two weeks of taking Quercetin, my shortness of breath disappeared, allowing me to walk and talk quickly without straining! Additionally, Quercetin greatly improved my immunity, alleviating pain, and I noticed relief from chronic rhinitis as my runny nose has stopped bothering me!

Hypertension details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 6 Reviews
8.8
9.5
Effective for hypertension
Most Useful Review
Quercetin reduces the risk of chronic vascular diseases and normalises permeability. As someone who takes it daily alongside Now Foods Bromelain, I've noticed it significantly helps manage my husband's high blood pressure, keeping it below 150 (it used to be 160/100). The addition of quercetin for hypertension has been beneficial.

Lung Cancer details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 7 Reviews
8.8
8.8
Immediate relief
Most Useful Review
I took it after recovering from COVID with my husband. We managed quite well, and while we used Nattokinase, zinc 100 mg, and Quercetin, our acquaintances used pharmacy medicines. I started taking this Quercetin for myself, my husband, relatives, and friends who had lung damage from the virus. I felt an improvement in my breathing on the very same day I started.

Arthritis details

SCIENTIFIC SCORE
Moderately Effective
Based on 16 Researches
8.3
USERS' SCORE
Good
Based on 3 Reviews
8.7
9
Quercetin nanoparticles reduce senescence
Nanoparticle-delivered quercetin exhibits enhanced efficacy in eliminating iron-overloaded senescent chondrocytes.
Most Relevant Research
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.
9.5
Wonders for shoulders
Most Useful Review
I was sceptical when I first heard about this on talk radio, but it works wonders on my arthritis in my shoulders! I used to take Mobic for that chronic pain.

Autoimmune Disorder details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 6 Reviews
8.7
9.5
Beneficial for allergies
Most Useful Review
Excellent product! I’ve appreciated the quality of Quercetin from a trusted supplier. The medium-sized capsules are easy to swallow. I take it during spring when tree pollen triggers my allergies; thanks to this supplement, I experienced no allergic reactions last year. I also use it during colds and buy it regularly. I highly recommend it!

Bone Pain details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 6 Reviews
8.7
9.5
Bone pain relief
Most Useful Review
Half a year ago, I had Covid, and my condition after the illness wasn't good. I experienced shallow breathing, heaviness in my chest, and pain in my bones alongside aching joints, not to mention severe fatigue and apathy. Despite taking several vitamins, my situation hardly improved. After a month of taking quercetin, my shortness of breath completely disappeared, and my vitality returned. The pain in my bones and joints has practically vanished. I've decided to continue taking quercetin for an additional two months. This supplement is essential!

Breast Cancer details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 6 Reviews
8.7
9.5
Heart disease protection
Most Useful Review
The best of Life Quercetin! It helps protect me from heart disease and cancer, also stabilising cells with anti-inflammatory and antihistamine effects.

Diarrhea details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 2 Reviews
8.7
9.5
No diarrhea occurred
Most Useful Review
This product effectively combats viral infections and aids sleep. Previously, I bought natural Sophora japonica quercetin, which was too cold and caused diarrhoea. However, after switching to this product, it no longer led to diarrhoea. Additionally, my sleep quality has improved significantly, and unlike GlyNAC, there is no development of tolerance with this product.

Headache details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 7 Reviews
8.7
9.5
Relieves headaches
Most Useful Review
Recommend!!! I have been taking quercetin on my doctor’s advice for 2-3 months as it acts as a "cleanser" for blood vessels and improves blood circulation. Notably, quercetin offers anti-inflammatory effects, benefiting conditions like heart disease, blood vessel issues, allergies, chronic fatigue, as well as combating infectious and autoimmune diseases. It effectively alleviates headaches caused by spasms in the brain's vessels, enhances my overall emotional state, and restores my energy and activity levels.

Pneumonia details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 7 Reviews
8.7
8.8
Preventative measure
Most Useful Review
It effectively helps prevent Wuhan pneumonia. If you feel unwell, just take one tablet and you'll feel better. It's an excellent formula!

Asthma details

SCIENTIFIC SCORE
Moderately Effective
Based on 10 Researches
8.7
USERS' SCORE
Good
Based on 6 Reviews
8.6
9
Quercetin alleviates asthma symptoms
Quercetin inhibits ferroptosis through the SIRT1/Nrf2/HO-1 signaling pathway and alleviates asthma disease.
Most Relevant Research
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.
9.5
Effective for asthma
Most Useful Review
Quercetin, extracted from cilantro and red onion, is a powerful antioxidant and anti-inflammatory. Its efficacy is excellent for reducing inflammation, asthma, allergic rhinitis, and other conditions. In severe cases, taking just one tablet daily resulted in my symptoms disappearing completely after a month.

Bloating details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 2 Reviews
8.6
9.5
Chronic relief
Most Useful Review
I've been using these enzymes daily for a month, and I'm feeling much better! They’ve significantly helped with my chronic bloating.

Bruise details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 2 Reviews
8.6
9.5
Improved microcirculation
Most Useful Review
Good formulation, it works effectively. Quercetin enhances blood microcirculation, and I have observed noticeable changes after a week of use. My eyes are no longer red, the visibility of blood vessels on my skin has decreased, and my bruises are healing more quickly. I find it best to take it half an hour after breakfast. Highly recommend!

Cancer details

SCIENTIFIC SCORE
Moderately Effective
Based on 16 Researches
8.5
USERS' SCORE
Good
Based on 7 Reviews
8.6
9
Quercetin's role against colorectal cancer
Structure-activity relationship analysis of mono-methylated quercetins by comprehensive MS/MS analysis and anti-proliferative efficacy in human colorectal cancer cells.
Most Relevant Research
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.
9.5
Reduces cancer risk
Most Useful Review
Quercetin is a powerful antioxidant that has a strong healing effect on the body. It addresses efforts to combat diseases such as stroke and heart attack. The anti-inflammatory properties of quercetin benefit blood vessels, lower blood pressure, and help prevent atherosclerosis. Its antioxidant action reduces the risk of cardiovascular disease. Including foods, particularly fruits and vegetables, rich in quercetin in your diet can significantly lower the risk of dangerous diseases. Quercetin possesses strong anti-tumour properties and can inhibit the growth of new cancer cells. In larger doses, it may even eliminate cancer cells.

Sinusitis details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 3 Reviews
8.6
9.5
Quick relief from sinusitis
Most Useful Review
Quercetin helped my whole family endure the coronavirus mildly! My mother developed a runny nose, which could lead to sinusitis. On the first day, she took 500 mg twice daily along with zinc, and by the next day, her symptoms had vanished! I'm very pleased with quercetin and the dosage!

Sleep Apnea details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 4 Reviews
8.6
9.5
Improved sleep quality
Most Useful Review
After taking this, my sleep quality has notably improved. I will definitely purchase it again.

Allergies details

SCIENTIFIC SCORE
Likely Very Effective
Based on 1 Research
9
USERS' SCORE
Good
Based on 98 Reviews
8.5
9
Quercetin shows promise in allergies
In-silico exploring pathway and mechanism-based therapeutics for allergic rhinitis: Network pharmacology, molecular docking, ADMET, quantum chemistry and machine learning based QSAR approaches.
Most Relevant Research
We delved into the potential of quercetin as a therapeutic option for treating allergic rhinitis, a common condition affecting roughly 40% of the global population. This study utilized various in-silico approaches, such as network pharmacology and molecular docking, to identify compounds from traditional medicinal plants and assess their effectiveness.

Among the 241 compounds analyzed, quercetin stood out due to its strong binding affinities with important targets linked to inflammatory and immune pathways. Our assessments indicated that quercetin could interact effectively with key cytokines involved in allergic reactions, potentially reducing allergy symptoms.

While the study highlighted promising implications for quercetin, it did not isolate its effects from other examined compounds. Therefore, further experimental testing is needed to affirm its benefits and effectiveness in real-world allergy treatment situations.
8.8
Effective for allergies
Most Useful Review
I recommend quercetin for its benefits in treating allergies and improving blood flow. This natural supplement has anti-inflammatory properties and can alleviate headaches caused by vessel spasms. It has significantly improved my overall well-being.

Brain Tumor details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 3 Reviews
8.5
8.8
Cognitive enhancement
Most Useful Review
Quercetin is essential for maintaining good brain function, and I always order it here.

Cardiovascular Disease details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 5 Reviews
8.5
6.3
Promotes vascular integrity
Most Useful Review
This supplement helps maintain normal cholesterol levels, safeguarding the integrity of vascular endothelium and enhancing cardiovascular health. I've already completed one bottle and intend to continue taking it.

Common Cold details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 22 Reviews
8.5
9.5
Prevention recommended
Most Useful Review
For immunity, it is crucial! Following Dr. Murray's advice, I take Quercetin at 250 - 500 mg daily, NAC 600 mg twice a day, and Selenium. This regimen significantly aids in preventing and treating symptoms of colds and viruses. Thank you, Ayherb! Cheers to Dr. Murray!

Hives details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 9 Reviews
8.5
9.5
Consistent hives management
Most Useful Review
Five Stars. I find that I have to take this multiple times throughout the day to keep hives at bay.

Influenza details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 2 Reviews
8.5
8.8
Preventive effects observed
Most Useful Review
I purchased a bottle of multivitamins along with quercetin for my family to help prevent influenza and COVID-19. The price is reasonable, and the capsules are easy to swallow.

Irritable Bowel Syndrome details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 2 Reviews
8.5
8.8
Improved well-being
Most Useful Review
Excellent! Postcoid syndrome had been troubling me. After reading about how quercetin can help with this issue, I ordered it from this manufacturer. Within a week of starting the supplement, I began to feel significantly better. I’m not quite sure how it works, but it definitely assists. I plan to continue taking quercetin to enhance the results.

Migraine details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 2 Reviews
8.5
9
Improved migraine relief
Most Useful Review
Great, it normalises sleep with regular intake of 2 capsules and significantly improves my migraines. The special effects kick in, and when I take the pills as usual, supplemented with magnesium, the migraine fades lightly within a couple of hours. Previously, I would be incapacitated for half a day. The frequency of attacks has decreased, likely aided by my consistent medicinal support. Regular magnesium intake eases both PMS and menstruation; I no longer feel irritable, and the first day can pass without painkillers. Chronic nasopharyngeal pain hardly worsens. While it’s tough to attribute all benefits solely to magnesium—given my omega-3 and other supplements—I believe it has played a part. With magnesium, lecithin, and protein, I truly noticed the positive effect of taking collagen. There were no allergic reactions or stomach issues, and the quality is superb with natural ingredients.

Psoriasis details

SCIENTIFIC SCORE
Possibly Effective
Based on 3 Researches
7.7
USERS' SCORE
Good
Based on 2 Reviews
8.5
7
Quercetin shows promise for psoriasis
Inhibition of PI3K/AKT/GLUT1 Signaling Pathway by Quercetin in the Treatment of Psoriasis.
Most Relevant Research
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.
8
Improved immune function
Most Useful Review
Great product! I've noticed a difference at week four with some inflammation in my joints and reduced flare-ups of psoriasis on my face. I haven't been ill yet, despite winter approaching and my two young kids having minor colds, indicating that my immune system seems to be functioning better as well.

Yeast Infection details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 2 Reviews
8.5
9.5
Boosts immunity
Most Useful Review
Excellent! The company is reputable and well-known for the quality of its products. The quantity is generous, and the ingredients are top-notch. Quercetin capsules strengthen the immune system by raising glutathione levels, a potent antioxidant that aids in combating infections. The taste is absent, and the packaging is superb. The benefits we've experienced from this product are truly beneficial; we pray for healing and safety. Please read the ingredients carefully before use to ensure they align with your health needs.

Whooping Cough details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 9 Reviews
8.4
10
Cough disappeared
Most Useful Review
Excellent! After enduring COVID-19, I struggled to shake off my cough. I tried various medications and syrups to no avail. Upon learning about quercetin’s effectiveness for airway inflammation, I decided to try it. Taking two capsules daily led to a significant reduction in my cough, and breathing became easier, all thanks to quercetin. It is also a remarkable antioxidant that bolsters our immune system, with added vitamin C and bioflavonoids ensuring its efficacy.

Acne details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Good
Based on 2 Reviews
8.1
8
Improves skin condition
Most Useful Review
I purchased this to improve my child’s skin. Since middle school, my acne worsened, and with existing atopic dermatitis, the change was sudden. I managed with hospital medicines and strong ointments, but it's surprising to find a skin nutrition product like this. My child is eating well, and I hope it has a positive effect. I am truly grateful to have discovered this.

Eczema details

SCIENTIFIC SCORE
Moderately Effective
Based on 1 Research
8
USERS' SCORE
Good
Based on 10 Reviews
8
8
Quercetin shows promise for eczema
Antioxidant Activity of Quercetin-Containing Liposomes-in-Gel and Its Effect on Prevention and Treatment of Cutaneous Eczema.
Most Relevant Research
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.
9.5
Eczema not recurred
Most Useful Review
After taking it for a few months, my eczema and urticaria has not recurred, which is amazing. I usually have to go to the hospital around this time of year!

Heart Attack details

SCIENTIFIC SCORE
No researches found
N/A
USERS' SCORE
Moderately Good
Based on 5 Reviews
7.8
9.5
Promotes heart longevity
Most Useful Review
Quercetin supports heart health and longevity.

Dizziness details

SCIENTIFIC SCORE
Moderately Effective
Based on 1 Research
8
USERS' SCORE
Moderately Good
Based on 2 Reviews
7.7
8
Ascovertin improves dizziness metrics
[Clinical efficacy of a novel hemorheological drug ascovertin in patients with vascular encephalopathy].
Most Relevant Research
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.
2.5
Stopped due to dizziness
Most Useful Review
There was severe dizziness from the medication, so I had to cease taking it.
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