Most clinical research shows that taking quercetin before exercise does not decrease fatigue or improve exercise ability. 2019;11(1). It is noteworthy that the Quercetin Phytosome treatment was well tolerated and that no notable side effects were reported. Ou Q, Zheng Z, Zhao Y, Lin W. Impact of quercetin on systemic levels of inflammation: a meta-analysis of randomised controlled human trials. Ahrens MJ, Thompson DL. View abstract. That being said, it costs more and, if you can't afford it, a good quality supplement … Clin Cancer Res 1996;2:659-67.. View abstract. View abstract. Information from this source is evidence-based and objective, and without commercial influence. $7.50. However, taking a daily quercetin supplement does not seem to improve. 2001;131(10):2648-2652. View abstract. Cesarone MR, Belcaro G, Hu S, et al. The improvement of time to complete the run was greater in subjects on quercetin supplementation compared with the control group (-11.3% vs. -3.9%; P<0.05). Inhibition of human cytochrome P450 enzymes by constituents of St. John's wort, an herbal preparation used in the treatment of depression. Mol Nutr Food Res 2013;57(5):896-905. Ingestion of quercetin inhibits platelet aggregation and essential components of the collagen-stimulated platelet activation pathway in humans. Conquer JA, Maiani G, Azzini E, et al. For instance, 2 symptoms include headaches and an upset stomach. Last updated on Nov 11, 2020. Am J Clin Nutr 2001;73:941-8.. View abstract. View abstract. Cyclosporin (Neoral, Sandimmune) is changed and broken down by the liver. PLoS One. Drugs.com provides accurate and independent information on more than 24,000 prescription drugs, over-the-counter medicines and natural products. Phytother Res. Guo Y, Mah E, Davis CG, et al. Select a condition to view a list of vitamins. Early research suggests that taking quercetin does not prevent mouth sores caused by cancer drugs. J Nutr 2008;138(9):1615-1621. It’s one of the most abundant antioxidants in the diet and plays an important role in helping your body combat free … de Pascual-Teresa S, Johnston KL, DuPont MS, et al. Chronic quercetin ingestion and exercise-induced oxidative damage and inflammation. Nutr.Rev. 2000;5(3):196-208. 2012;32(8):557-64. Vitamin C plus ultra-absorbable quercetin for immune support. Effect of genistein and quercetin on proliferation, collagen synthesis, and type I procollagen mRNA levels of rat hepatic stellate cells. Early research shows that taking quercetin might reduce iron levels in people with beta-thalassemia who need blood transfusions. Along with a GRAS (Generally Recognized as Safe) status identification, it has no side effects in doses of a few grams a day in either humans or animals. In some people it might also improve how sensitive the body is to insulin. View abstract. Taking quercetin along with these medications that are changed by the liver might increase the effects and side effects of your medication. Quercetin is more effective than cromolyn in blocking human mast cell cytokine release and inhibits contact dermatitisCOVID-19 World Statistics. J Steroid Biochem Mol Biol 1997;63:9-15. Benefits Heart Disease Protection. Some side effects of bioflavonoids (the active ingredient contained in Quercetin) may occur that usually do not need medical attention. View abstract. Nieman DC, Henson DA, Davis JM, et al. Isolated quercetin is also marketed as a dietary supplement, mostly as the free quercetin aglycone, and frequently in daily doses of up to 1000 mg d-1 exceeding usual dietary intake levels. Eur J Obstet Gynecol Reprod Biol.