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Speak with your doctor. Quercetin may enhance the effect of these drugs, increasing your risk for bleeding. Anticoagulants include:. Test tube and animal studies suggest that quercetin may enhance the effects of doxorubicin and cisplatin, which are two chemotherapy medications used to treat cancer. In addition, some doctors believe taking antioxidants at the same time as chemotherapy can be harmful, while others believe it can be helpful. In one study, combining quercetin with the anti-tumor drug doxorubicin, increased the drug's beneficial effects on breast cancer cells.
In another, taking quercetin alongside cisplatin reduced the medicines' therapeutic effects in ovarian cancer cells. Talk to your oncologist before taking any supplements if you are undergoing chemotherapy. Quercetin may interfere with the body's absorption of this drug, which is used to suppress the immune system.
Since quercetin affects the liver, concomitant use with medications that are changed by the liver may alter how the body metabolizes these medications.
Speak with your physician. Health effects of quercetin: from antioxidant to nutraceutical. Eur J Pharmacol. The quercetin paradox. Toxicol Appl Pharmacol. Oxidative damage and protection of the RPE. Prog Retin Eye Res. Synergy between ethanol and grape polyphenols, quercetin, and resveratrol, in the inhibition of the inducible nitric oxide synthase pathway.
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Br J Nutr. A prospective study of dietary flavonoid intake and incidence of epithelial ovarian cancer. Int J Cancer. The flavonoid quercetin regulates growth and gene expression in rat FRTL-5 thyroid cells. Anti-inflammatory properties of plant flavonoids. Effects of rutin, quercetin, and hesperidin on adjuvant arthritis in rat.
Antioxidants in vegan diet and rheumatic disorders. Food Chem Toxicol. Log in Profile. Saved Articles. Contact Support. Log Out. Your cart is empty. Our online classes and training programs allow you to learn from experts from anywhere in the world. Explore Classes. Stephanie Eckelkamp is a writer and editor who has been working for leading health publications for the past 10 years.
She received her B. Medical review by Heather Moday, M. Heather Moday, M. Last updated on June 2, What is quercetin? Health benefits of quercetin. It may reduce the risk of viruses, from colds to herpes. It can probably help with seasonal allergies. It may help reduce chronic inflammation. It may boost cognitive function and ward off dementia. It seems to have properties that reduce the risk of cancer.
It may support cardiovascular and heart health in several key ways. People who eat diets rich in flavonoid antioxidants tend to have lower cholesterol levels.
Oxidative stress can wreak havoc on fatty structures in the body. Lab studies suggest that quercetin helps prevent LDL cholesterol the "bad" kind of cholesterol from oxidizing into an even more dangerous form.
One study in the Journal of the American Heart Association found that mg of quercetin per day significantly decreased systolic and diastolic blood pressure , especially among people with diabetes. It may have a range of other potential benefits. Longevity: According to Rountree, quercetin's ability to promote mitochondrial biogenesis and combat oxidative stress might just boost life span. Chronic prostatitis: Quercetin's anti-inflammatory properties may help treat this condition, characterized by inflammation of the prostate.
Interstitial cystitis: Flavonoids in general seem to help ease symptoms in women with the intense bladder pain and pressure that accompanies interstitial cystitis. Athletic performance: Studies aren't conclusive, but some suggest quercetin enhances endurance and performance, thanks to mitochondrial biogenesis.
In the trial, 95 patients with COVID are receiving a 1,mg active treatment dose and healthcare workers are receiving a mg dose as prophylaxis. In both treatment arms, quercetin is administered with vitamin C and bromelain, a supplement extracted from pineapples that is used for burns or inflammation. Marik, MD, chief of pulmonary and critical care medicine there.
Marik included quercetin in the institution's COVID management protocol for prophylaxis and mild to moderate cases. Given the antiviral activity that has been demonstrated in preclinical data, it would be reasonable to prescribe quercetin in the context of a properly designed clinical trial for treating COVID, commented David M.
However, Aronoff told MedPage Today in an email that "it should be subjected to rigorous clinical study and not recommended for use outside of clinical trials.
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