Quercetin is a type of phytochemical. Phytochemicals are chemicals that are found in plants. Specifically, quercetin is a flavonoid. Flavonoids are also known as plant pigments, because they give many plants their color. While quercetin is found naturally in plants, it may also be taken as a supplement for its potential health benefits.
A quercetin supplement may be taken if a person does not consume much of the foods that naturally contain it. Natural sources of quercetin include red wine, teas, and olive oil. It is also found in fruits and vegetables, such as apples, red onions, and dark cherries, as well as dark berries.
The antioxidant power of quercetin is among its potential health benefits. Antioxidants are important for ridding the body of particles called free radicals. These are often responsible for damage to the body’s cells and DNA, which may accelerate the natural aging process.
A quercetin supplement may also be taken by patients who suffer from allergies. Allergic reactions occur when immune cells release chemicals called histamines. Quercetin is an anti-histamine, which means that it may help thwart cells from releasing this chemical. It is possible that a quercetin supplement may help alleviate allergy symptoms, such as hives, runny nose, and watery eyes.
Quercetin is also sometimes taken for its anti-inflammatory properties. It may help alleviate any inflammatory condition, such as arthritis or ulcers. A quercetin supplement may also help relieve symptoms of inflammation of the prostate, known as prostatis.
Cancer patients may also choose to take a quercetin supplement because it may help inhibit the growth of cancer cells, and even encourage the death of these cells. Cancer patients should not neglect a traditional treatment plan in favor of supplements, however. This flavonoid may be taken in conjunction with other treatments, under a doctor’s guidance.
Some patients who suffer from heart disease, or are at risk for it, may also take a quercetin supplement. It and other flavonoids, such as resveratrol, may help reduce the build-up of plaque in the arteries. This condition is known as atherosclerosis. Reducing plaque may help prevent heart disease, heart attack, and stroke.
Before a patient considers taking a quercetin supplement, he should consult with his doctor. A physician can decide whether or not it is safe for that particular patient. For example, quercetin supplements may interact with some medications, such as blood-thinners, aspirin, and chemotherapy. It may also interact with cyclosporine and corticosteroids.
Additionally, women who are pregnant or breastfeeding should not take these supplements. People who have kidney disease should also avoid it because, at high doses, quercetin may lead to kidney damage. High levels may also result in mild side effects, such as a headache, upset stomach, and nausea.
The amount of a typical dosage varies, depending on what condition a patient is treating. When supplementing for general health, adults should aim to take approximately 100 to 250 mg, three times daily. Patients should consult with their doctor for a dosage to treat a specific medical condition. Children should avoid these supplements.