Overview

SCIENTIFIC SCORE
Possibly Effective
Based on 16 Researches
7.9
USERS' SCORE
Medium or Average
Based on 22 Reviews
6.4
Supplement Facts
Serving Size:   2 Veg Capsules
Amount Per Serving
%DV
Quercetin
800 mg
**
Bromelain (2,400 GDU/g)
165 mg
**

Top Medical Research Studies

9.5
We explored the effects of quercitrin on platelet activation to better understand its role in blood clotting. Through comprehensive experiments—like assessing platelet aggregation and thrombus formation—we observed that quercitrin significantly hinders platelet activation. This means it impairs platelet aggregation and granule secretion, which are crucial in forming blood clots.

Moreover, quercitrin showed promise in preventing arterial thrombus formation without extending bleeding time, hinting at its potential as a treatment for thrombotic diseases. Overall, our findings suggest that quercitrin could be beneficial in managing blood clot-related conditions.
Read More
We investigated how quercetin, a natural compound, can guard against the harmful effects of extracellular histones on platelets. Our study involved evaluating the interaction between histones and platelets in animal and lab settings.

We discovered that quercetin effectively inhibits histone-induced platelet activation and damage. This protection suggests that quercetin could be a valuable treatment option for conditions where histone toxicity plays a role, potentially assisting in the management of critical illnesses.
Read More
8
SXS shows promise against blood stasis
We investigated how Shi-Xiao-San, a traditional Chinese herbal formula, affects blood stasis, which relates to conditions like thrombosis and coronary heart disease. Through advanced techniques, we identified over 45 compounds, such as quercetin, that may play crucial roles in reducing blood viscosity and improving vascular health. Our tests showed that Shi-Xiao-San works by influencing key pathways involved in blood flow and inflammation. While promising, further studies are necessary to fully understand its mechanisms and benefits for treating blood clotting disorders.
Read More

Most Useful Reviews

9.5
Blood pressure reduction
After taking quercetin, my blood pressure finally dropped to 110/70, a level I've never achieved before. The warmth in my feet suggests improved blood circulation, leading to a lower reading.
Read More
9.5
Strong allergy relief
Amazing and effective rescue for strong allergy rashes! My private had severe allergy rashes; neither Claritine nor Lorrine provided significant relief, affecting his sleep for days. This supplement brought relief by the second day, with rashes and blood clots on his skin completely disappearing by day three. Dosage was as recommended (2+2). A tremendous relief that allowed him to sleep, exercise, and enjoy tea and coffee again. Very mild, with no side effects on kidneys or anything else. Highly recommended!
Read More
9.5
Blood pressure stabilisation
After suffering from Covid, I experienced significant issues with my blood vessels and blood pressure. My doctor recommended quercetin, instructing me to take it an hour before or two hours after meals. While it is a long-term commitment (2-4 months) and not inexpensive, my condition has stabilised, so I’m completely satisfied and will continue the course.
Read More

Medical Researches

SCIENTIFIC SCORE
Possibly Effective
Based on 16 Researches
7.9
  • All Researches
9.5
We explored the effects of quercitrin on platelet activation to better understand its role in blood clotting. Through comprehensive experiments—like assessing platelet aggregation and thrombus formation—we observed that quercitrin significantly hinders platelet activation. This means it impairs platelet aggregation and granule secretion, which are crucial in forming blood clots.

Moreover, quercitrin showed promise in preventing arterial thrombus formation without extending bleeding time, hinting at its potential as a treatment for thrombotic diseases. Overall, our findings suggest that quercitrin could be beneficial in managing blood clot-related conditions.
Read More
9
Quercetin as anticoagulant examined
We investigated the potential of quercetin, a compound from the African eggplant, to act as an anticoagulant. By using various methods including bioassay-guided fractionation, we studied its effects on blood clotting in mice. Our experiments revealed promising anticoagulant activities.

While quercetin shows effectiveness against clot formation, further research is needed to fully understand its mechanisms and therapeutic potential in treating cardiovascular diseases. Overall, this suggests quercetin may serve as a valuable herbal option for cardiovascular health.
Read More
9
Taxifolin inhibits NETosis, aids thrombo-inflammation
We investigated how taxifolin, a bioactive flavonoid, could impact diseases associated with blood clots like lupus and antiphospholipid syndrome (APS). Using in vitro assays and mouse models, we observed that taxifolin significantly inhibits the formation of neutrophil extracellular traps—an action known as NETosis—linked to inflammation and clotting. Notably, taxifolin reduced autoantibody formation and large-vein thrombosis in these models. This pioneering study suggests that taxifolin may offer protective benefits against thrombo-inflammatory conditions, making it an exciting area for further research.
Read More
9
Baiying Qingmai reduces thrombosis
We explored how Baiying Qingmai Formulation (BF) affects thromboangiitis obliterans (TAO) by analyzing its chemical makeup and how it interacts with various signaling pathways.

Our findings showed that BF significantly inhibits important proteins related to inflammation and blood clotting. It not only decreases harmful cytokines but also increases protective metabolites in the bloodstream.

Ultimately, we believe BF offers a promising path to alleviate symptoms of TAO by reducing blood clots and improving vascular health in affected individuals.
Read More
9
Quercetin aids hemorrhoid treatment
We closely examined a retrospective study focused on how a blend of micronized flavonoids, including quercetin, can alleviate symptoms of grade II and III hemorrhoidal disease.

Patients taking this compound showed a notable 89.8% success rate in reducing hemorrhoid severity after just one week of treatment.

Improvements were seen across a range of symptoms with no reported side effects. Overall, this study suggests that quercetin, alongside other ingredients, may effectively help manage hemorrhoidal symptoms safely.
Read More

User Reviews

USERS' SCORE
Medium or Average
Based on 22 Reviews
6.4
  • All Reviews
  • Positive Reviews
  • Negative Reviews
9.5
Blood pressure reduction
After taking quercetin, my blood pressure finally dropped to 110/70, a level I've never achieved before. The warmth in my feet suggests improved blood circulation, leading to a lower reading.
Read More
9.5
Strong allergy relief
Amazing and effective rescue for strong allergy rashes! My private had severe allergy rashes; neither Claritine nor Lorrine provided significant relief, affecting his sleep for days. This supplement brought relief by the second day, with rashes and blood clots on his skin completely disappearing by day three. Dosage was as recommended (2+2). A tremendous relief that allowed him to sleep, exercise, and enjoy tea and coffee again. Very mild, with no side effects on kidneys or anything else. Highly recommended!
Read More
9.5
Blood pressure stabilisation
After suffering from Covid, I experienced significant issues with my blood vessels and blood pressure. My doctor recommended quercetin, instructing me to take it an hour before or two hours after meals. While it is a long-term commitment (2-4 months) and not inexpensive, my condition has stabilised, so I’m completely satisfied and will continue the course.
Read More
8.8
Post-Covid benefits
I started taking Quercetin in my recovery regimen after Covid. The results are excellent; headaches have significantly reduced, and shortness of breath has ceased. Being a powerful antioxidant, it aids in thinning the blood, and I will continue its regular use.
Read More
2.5
Caution advised
I found the daily recommended dose of 500 mg too high, as the two capsules contain 800 mg. For instance, my five-year-old experienced nosebleeds after taking just one. Quercetin reduces blood clotting, which can pose risks; hence, I recommend starting at 250 mg. I prefer quercetin from Natural Factors, having heard no serious health concerns about it. Wishing health to all!
Read More

Frequently Asked Questions

A blood clot is a mass of blood that changes from a liquid to a gel, effectively forming a plug that can stop bleeding. This natural process, known as coagulation, is critical for preventing excessive blood loss when you sustain an injury. Blood clots can occur in various areas of the body, typically at the site of a wound, but they can also form within blood vessels without an obvious injury, which may lead to serious health complications.

While blood clots are essential for healing, they can pose significant health risks if they form inappropriately. For example, a deep vein thrombosis (DVT) occurs when a clot forms in a deep vein, usually in the legs, and can travel to the lungs, causing a life-threatening condition called a pulmonary embolism. Risk factors for blood clots include prolonged immobility, certain medical conditions, and the use of specific medications, among others. It’s important to recognize the symptoms of abnormal clotting, such as swelling, pain, and redness in the affected area, and seek medical attention if they occur.

Quercetin is a naturally occurring flavonoid that is found in a variety of fruits, vegetables, and grains. Known for its antioxidant properties, quercetin is believed to help combat oxidative stress in the body, which can contribute to various health issues. You can commonly find it in foods such as apples, onions, berries, and citrus fruits, as well as in leafy greens. This makes it a popular dietary supplement among health enthusiasts looking to enhance their overall wellness.

Beyond its antioxidant capacity, quercetin is also being researched for its potential anti-inflammatory effects and benefits for immune support. Some studies suggest that it may help reduce allergy symptoms and improve exercise performance by decreasing muscle fatigue. With its wide range of potential health benefits, quercetin is often marketed as a natural remedy for various ailments, although it’s essential to consult a healthcare professional before starting any new supplement regimen to ensure its safety and effectiveness for your specific needs.

Based on user reviews, the time it takes to see results from taking quercetin for blood-related issues can vary significantly. Some users report experiencing noticeable improvements as quickly as two to three days. For example, one reviewer noted that their allergy rashes and blood clots improved significantly by the third day of taking the supplement, allowing them to resume normal activities smoothly (Read Review). In contrast, other users indicate a longer timeframe for achieving optimal effects, suggesting that consistent use over two to four months could lead to more substantial benefits (Read Review).

It is essential to consider the variability in individual responses to quercetin. While some users report immediate effects on their blood pressure and circulation after just a few days (Read Review) (Read Review), others have noted little to no improvement even after extended use (Read Review) (Read Review). Therefore, personal experience may differ, and it may be necessary to use the supplement consistently while monitoring your progress.

Numerous studies suggest that supplements, particularly quercetin, could support efforts to manage blood clot risks. Research has identified quercetin as a potent antithrombotic compound, demonstrating its ability to inhibit platelet activation and thrombus formation, which are critical in blood clotting. One study found quercetin can effectively block the activation states of platelets, which plays a significant role in preventing unwanted clot formation ([14]). Another investigation pointed towards quercetin's effectiveness in various contexts, including its role in managing blood clotting issues related to conditions like diabetes and COVID-19 ([3], [12]).

Moreover, quercetin's anticoagulant properties have been confirmed in several experimental setups, showcasing its potential effectiveness in treating thrombotic diseases ([4]). Furthermore, the broader family of flavonoids has been found to exhibit similar beneficial properties, making them worthy of consideration for those at risk of thrombotic events. While these findings are promising, further research is essential to fully understand the mechanisms involved and to confirm these compounds' effectiveness and safety in clinical settings.

Based on user reviews, several individuals have reported noticeable improvements in their symptoms after taking quercetin, particularly regarding blood pressure and circulation. For instance, one user achieved a record-low blood pressure of 110/70 and reported improved warmth in their feet, indicating enhanced blood circulation (Read Review). Other users have similarly experienced drops in blood pressure and reported softer blood vessels, with a few expressing hope that it might help with cognitive concerns such as dementia (Read Review) (Read Review).

In addition, many users have shared positive experiences regarding allergy symptoms, with significant relief from rashes and related discomfort within just a few days of use. One reviewer highlighted that their allergy-related rashes disappeared completely by the third day of taking quercetin (Read Review). Meanwhile, others noted improvements in headaches, shortness of breath, and overall blood vessel health during recovery from Covid (Read Review) (Read Review). However, it's important to note that individual responses can vary significantly, as some users experienced little to no improvement despite consistent use (Read Review).

Based on user reviews, there are various insights regarding the combination of quercetin with other supplements for addressing blood clot issues. One user noted the effective pairing of quercetin with bromelain, stating that it enhances the benefits for blood vessels, particularly mentioning its role in fighting blood clots and allergic reactions (Read Review). Additionally, another reviewer highlighted the positive effect of combining quercetin with zinc, reporting that this combination improved taste and smell during illness while also contributing to blood clot prevention (Read Review).

However, caution is advised when using quercetin, especially regarding its blood-thinning properties. A user reported experiencing increased bleeding while brushing their teeth, leading them to adjust their intake to a lower dose (Read Review). Another user also expressed concerns about quercetin's blood-thinning effects and suggested starting with a lower dosage (Read Review). Overall, many users recommend integrating quercetin with other supplements like bromelain and zinc while being mindful of individual responses and potential side effects.

Users report varying experiences with the dosing of Quercetin for treating blood clots and related issues. Some individuals, such as the reviewer with ID (Read Review), mention following a dosage recommendation of 2+2, which maximized effectiveness without adverse effects. However, caution is advised by another user who found the common dose of 500 mg too high for their child, suggesting a starting dose of 250 mg to mitigate risks associated with blood thinning (Read Review).

Additionally, other reviewers emphasize the importance of taking Quercetin as part of a longer-term approach to stabilize conditions like high blood pressure and improve vascular health, often suggesting an intake of one capsule in the mornings as part of a regimen with other supplements (Read Review). While feedback about Quercetin’s effectiveness in thinning the blood and promoting better circulation is prevalent across various reviews, users recommend monitoring individual responses and adjusting doses accordingly to achieve the best results without compromising safety.

9.5
Strong allergy relief
Amazing and effective rescue for strong allergy rashes! My private had severe allergy rashes; neither Claritine nor Lorrine provided significant relief, affecting his sleep for days. This supplement brought relief by the second day, with rashes and blood clots on his skin completely disappearing by day three. Dosage was as recommended (2+2). A tremendous relief that allowed him to sleep, exercise, and enjoy tea and coffee again. Very mild, with no side effects on kidneys or anything else. Highly recommended!
9.5
Blood pressure stabilisation
After suffering from Covid, I experienced significant issues with my blood vessels and blood pressure. My doctor recommended quercetin, instructing me to take it an hour before or two hours after meals. While it is a long-term commitment (2-4 months) and not inexpensive, my condition has stabilised, so I’m completely satisfied and will continue the course.
9.5
Blood pressure reduction
After taking quercetin, my blood pressure finally dropped to 110/70, a level I've never achieved before. The warmth in my feet suggests improved blood circulation, leading to a lower reading.
9.5
Vascular improvement
Taking quercetin seems to prevent the coronavirus from adhering to receptors. It may improve blood vessel health, and I’ve noticed a drop in my blood pressure since starting it.
3.5
Blood pressure issue
I am taking this to manage my blood pressure, but it doesn't seem to lower it effectively.
3.5
No significant change
I began taking this for my high blood pressure, but I've not noticed any substantial changes. However, it appears to be beneficial for my body.
8
Improved blood flow
My blood pressure has dropped since taking it, and my blood vessels feel softer. I'm hopeful it might help with cerebral blood flow and counter dementia, which worries me more than Covid.
8.8
Post-Covid benefits
I started taking Quercetin in my recovery regimen after Covid. The results are excellent; headaches have significantly reduced, and shortness of breath has ceased. Being a powerful antioxidant, it aids in thinning the blood, and I will continue its regular use.
8.8
Reduced inflammation
I've taken quercetin since September 2020 for my varicose veins and overall health. After cycles of chemotherapy, it helped reduce inflammation and supported my blood vessels. I feel much better.
3.5
No noticeable effects
After my recent illness, I felt no improvements; my blood remained thick, and I received no relief for my hay fever. I don’t understand the enthusiasm in other reviews regarding this product.
8.8
Zinc absorption
I take quercetin with zinc to enhance absorption, especially when infected with Covid. It helped my partner regain taste and smell within days, and it’s beneficial for preventing blood clots.
5.8
Acne reduction
This product has worked well, clearing up 80% of my acne over the month with the combination of this and Virastop. However, I noticed I bleed more easily while brushing my teeth, likely due to its blood-thinning properties, so I will reduce my intake from four a day to one.
2.5
Caution advised
I found the daily recommended dose of 500 mg too high, as the two capsules contain 800 mg. For instance, my five-year-old experienced nosebleeds after taking just one. Quercetin reduces blood clotting, which can pose risks; hence, I recommend starting at 250 mg. I prefer quercetin from Natural Factors, having heard no serious health concerns about it. Wishing health to all!
8.8
Nasal relief
I take one capsule of quercetin each morning with vitamin C and Iron. It seems to enhance vitamin C absorption and has improved my nasal inflammation, although it's not a miracle cure on its own.
We investigated whether quercetin, along with other flavonoids, impacts platelet activity, which is crucial for blood clotting. Using blood samples from healthy volunteers, we looked at how these compounds influence the activation states of platelets through a specialized laboratory technique.

Our findings showed that quercetin and the other flavonoids demonstrated significant antiplatelet activity, effectively blocking a key receptor involved in platelet aggregation. This work helps shed light on how these natural compounds may play a role in preventing cardiovascular issues by reducing unwanted blood clot formation.
We explored the effects of polyphenols, specifically quercetin, on the bioenergetics and function of platelets under conditions of normoglycemia and acute hyperglycemia. Our study evaluated how these compounds can impact platelet activity that typically increases due to high blood sugar levels.

We found that the use of polyphenols like quercetin helps lessen heightened platelet activity caused by hyperglycemia. This suggests that quercetin might play a role in reducing clot formation risk for patients with diabetes.

Overall, polyphenols have promising potential in thrombosis prevention, but further research is likely needed to fully understand their benefits.
4
Quercetin's uncertain effects on clotting
We explored the potential of quercetin as a treatment related to COVID-19, especially its role in managing blood clotting. The research highlights that quercetin can help reduce coagulation issues, particularly in patients suffering from COVID-19, by inhibiting certain proteins involved in clot formation. However, while quercetin shows promise in this area, the evidence does not firmly establish its effectiveness as a definitive treatment for blood clots in COVID-19 patients. Further investigation is necessary to clarify its benefits in clinical settings.
9
Quercetin as anticoagulant examined
We investigated the potential of quercetin, a compound from the African eggplant, to act as an anticoagulant. By using various methods including bioassay-guided fractionation, we studied its effects on blood clotting in mice. Our experiments revealed promising anticoagulant activities.

While quercetin shows effectiveness against clot formation, further research is needed to fully understand its mechanisms and therapeutic potential in treating cardiovascular diseases. Overall, this suggests quercetin may serve as a valuable herbal option for cardiovascular health.

References

  1. Dai J, He W, Liu SA, Huang S, He X, et al. Rapid screening of the antithrombotic active components of Ledeb with thrombin binding affinity ultrafiltration mass spectroscopy. Anal Methods. 2025;17:2046. doi:10.1039/d4ay01909a
  2. Manikanta K, NaveenKumar SK, Hemshekhar M, Thushara RM, Mugesh G, et al. Quercetin inhibits platelet activation and ER-stress mediated autophagy in response to extracellular histone. Phytomedicine. 2025;138:156386. doi:10.1016/j.phymed.2025.156386
  3. Gauer JS, Ajanel A, Kaselampao LM, Candir I, MacCannell ADV, et al. Plant-derived compounds normalize platelet bioenergetics and function in hyperglycemia. Res Pract Thromb Haemost. 2024;8:102548. doi:10.1016/j.rpth.2024.102548
  4. Gogoi D, Chattopadhyay P, Dolui SK, Khan MR, Mukherjee AK. Studies on in vivo antithrombotic activity of quercetin, a natural flavonoid isolated from a traditional medicinal plant, African eggplant (Solanum indicum). J Ethnopharmacol. 2024;335:118686. doi:10.1016/j.jep.2024.118686
  5. Rysenga CE, May-Zhang L, Zahavi M, Knight JS, Ali RA. Taxifolin inhibits NETosis through activation of Nrf2 and provides protective effects in models of lupus and antiphospholipid syndrome. Rheumatology (Oxford). 2024;63:2006. doi:10.1093/rheumatology/kead547
  6. Fan W, Lan S, Yang Y, Liang J. Network pharmacology prediction and molecular docking-based strategy to discover the potential pharmacological mechanism of Huang-Qi-Gui-Zhi-Wu-Wu decoction against deep vein thrombosis. J Orthop Surg Res. 2023;18:475. doi:10.1186/s13018-023-03948-6
  7. Zou C, Liu L, Huang C, Hu S. Baiying qingmai formulation ameliorates thromboangiitis obliterans by inhibiting HMGB1/RAGE/NF-κB signaling pathways. Front Pharmacol. 2022;13:1018438. doi:10.3389/fphar.2022.1018438
  8. Wei X, Gao M, Sheng N, Yao W, Bao B, et al. Mechanism investigation of Shi-Xiao-San in treating blood stasis syndrome based on network pharmacology, molecular docking and in vitro/vivo pharmacological validation. J Ethnopharmacol. 2023;301:115746. doi:10.1016/j.jep.2022.115746
  9. Hu M, Peng X, Shi S, Wan C, Cheng C, et al. Sulfonated, oxidized pectin-based double crosslinked bioprosthetic valve leaflets for synergistically enhancing hemocompatibility and cytocompatibility and reducing calcification. J Mater Chem B. 2022;10:8218. doi:10.1039/d2tb01704k
  10. Liao X, Zhuang X, Liang C, Li J, Flaumenhaft R, et al. Flavonoids as Protein Disulfide Isomerase Inhibitors: Key Molecular and Structural Features for the Interaction. J Agric Food Chem. 2022;70:4475. doi:10.1021/acs.jafc.1c07994
  11. Gravina AG, Pellegrino R, Facchiano A, Palladino G, Loguercio C, et al. Evaluation of the Efficacy and Safety of a Compound of Micronized Flavonoids in Combination With Vitamin C and Extracts of , , and for the Reduction of Hemorrhoidal Symptoms in Patients With Grade II and III Hemorrhoidal Disease: A Retrospective Real-Life Study. Front Pharmacol. 2021;12:773320. doi:10.3389/fphar.2021.773320
  12. Manjunath SH, Thimmulappa RK. Antiviral, immunomodulatory, and anticoagulant effects of quercetin and its derivatives: Potential role in prevention and management of COVID-19. J Pharm Anal. 2022;12:29. doi:10.1016/j.jpha.2021.09.009
  13. Lee S, Yu Y, Trimpert J, Benthani F, Mairhofer M, et al. Virus-induced senescence is a driver and therapeutic target in COVID-19. Nature. 2021;599:283. doi:10.1038/s41586-021-03995-1
  14. Zaragozá C, Monserrat J, Mantecón C, Villaescusa L, Álvarez-Mon MÁ, et al. Binding and antiplatelet activity of quercetin, rutin, diosmetin, and diosmin flavonoids. Biomed Pharmacother. 2021;141:111867. doi:10.1016/j.biopha.2021.111867
  15. Rojas-Garbanzo C, Rodríguez L, Pérez AM, Mayorga-Gross AL, Vásquez-Chaves V, et al. Anti-platelet activity and chemical characterization by UPLC-DAD-ESI-QTOF-MS of the main polyphenols in extracts from Psidium leaves and fruits. Food Res Int. 2021;141:110070. doi:10.1016/j.foodres.2020.110070
  16. Oh TW, Do HJ, Jeon JH, Kim K. Quercitrin inhibits platelet activation in arterial thrombosis. Phytomedicine. 2021;80:153363. doi:10.1016/j.phymed.2020.153363
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