However, since there is currently a lack of human studies on quercetin's cancer-fighting effects, it's too soon to tell whether quercetin might play a significant role in cancer prevention.
Quercetin is generally well-tolerated when used in appropriate amounts. Some have reported tingling in the arms and legs, as well as upset stomach and headaches when taking quercetin orally. Supplements haven't been tested for safety and due to the fact that dietary supplements are largely unregulated, the content of some products may differ from what is specified on the product label.
Also keep in mind that the safety of supplements in pregnant women, nursing mothers, children, and those with medical conditions or who are taking medications—particularly antibiotics—has not been established.
Under the care of medical supervision, quercetin has been safely used in amounts up to 1, mg twice daily for 12 weeks. The appropriate dose for you may depend on factors including your age, gender, and medical history. Speak to your healthcare provider to get personalized advice if you choose to take this supplement.
Food sources of quercetin include teas, onions, apples, buckwheat, and pau d'arco. These are plant-derived enzymes fruit extracts shown to increase the intestine's absorption of quercetin.
Due to the lack of supporting research, it's too soon to recommend quercetin for any health purpose. If you're considering using it, consult your primary care provider first.
Self-treating a condition and avoiding or delaying standard care may have serious consequences. Side effects of quercetin can include headache and upset stomach. It is generally considered safe for most people, but pregnant women, breastfeeding women, and people with kidney disease should avoid it. Quercetin can interact with antibiotics or blood thinners, so it might be wise to talk to a healthcare provider first. Foods that have quercetin include apples, onions, red wine, tea, and berries.
It can also be found in the herbs ginkgo biloba and St. Quercetin intake should never exceed one gram per day, since more than that amount can cause kidney damage. When taking a dietary supplement, always follow the guidelines on the product packaging. Sign up for our Health Tip of the Day newsletter, and receive daily tips that will help you live your healthiest life.
Memorial Sloan Kettering Cancer Center. Updated December 6, Quercetin and its anti-allergic immune respons e. Effects of quercetin on blood pressure: a systematic review and meta-analysis of randomized controlled trials.
J Am Heart Assoc. Quercetin and endurance exercise capacity: a systematic review and meta-analysis. Med Sci Sports Exerc. The effects of quercetin supplementation on body composition, exercise performance and muscle damage indices in athletes.
Int J Prev Med. Dietary quercetin, quercetin-gene interaction, metabolic gene expression in lung tissue and lung cancer risk. Penn State Hershey Milton S.
Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Last Update Posted : July 13, See Contacts and Locations. Study Description. FDA Resources. Arms and Interventions. Outcome Measures. Primary Outcome Measures : days of stay at hospital after treatment and discharge [ Time Frame: 28 days ] speed the days of recovery and discharge from hospital.
Secondary Outcome Measures : questionnaire including parameters like BMI,,smoking , underling diseases, immunological treatment , [ Time Frame: 28 days ] according to questionnaire including BMI, smoking , underlying diseases like hypertension, diabetes , asthmatic ,..
Eligibility Criteria. Information from the National Library of Medicine Choosing to participate in a study is an important personal decision.
Lactating women. Documented allergy to pineapple or to quercetin Documented history of mental illnesses. Contacts and Locations. Information from the National Library of Medicine To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor. Please refer to this study by its ClinicalTrials.
Layout table for location contacts Contact: amr ahmed drmedahmed gmail. Pandemic or not, supplements can be confusing. And when it comes to immune health , it seems like there's a new supplement on the market everyday, so it's hard to weed out which are worth buying. Taking targeted supplements that are science-backed can be a smart move to keep yourself well, especially as flu season is approaching.
One supplement you may have heard of recently is quercetin -- a flavonoid that acts as a powerful antioxidant and has reported benefits for immune health, lowering inflammation and -- in some cases -- fighting cancer. To find out if it's worth adding to your supplement lineup, keep reading for more on the science behind quercetin and insights from dietician nutritionist, Amy Shapiro. Quercetin is a flavonoid found naturally in many plants and foods like apples, grapes and broccoli.
Quercetin is popular as a supplement, often combined with other nutrients such as bromelain or vitamin C because it is not easily absorbed and used in the body on its own. Research shows quercetin has many health benefits. Quercetin is naturally found in many foods you might already eat.
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