Focus On: Quercetin

What good does this most active flavonoid accomplish?

What it is: Quercetin is a flavonoid found in fruits, vegetables, leaves, and grains. It is known to be one of the most active flavonoids.

[ Natural Sources ]

Red wine, onions, green tea, apples, berries, Ginkgo biloba, St. John’s wort, and American elder are all great sources of quercetin.

[ Benefits ]

Quercetin helps with allergies by preventing the release of histamine from certain immune cells. It has also been known to help with inflammation, high blood pressure, athletic endurance, chronic pelvic pain syndrome, cancer, cardiovascular disease, and cold and flu symptoms.

[ Recommended Dosage ]

There are no widely recognized dosage recommendations for quercetin. However, intakes from 100-1,000 mg per day, broken up into two to three doses, have been used without side effects.

[ Warnings ]

Very high doses of quercetin might cause kidney damage, headaches, and tingling of the arms and legs. There is not enough research to show if quercetin is safe for women that are breastfeeding or are pregnant, so avoid use. If using an IV for quercetin, flushing, sweating, shortness of breath, nausea, and vomiting are all possible side effects.

[ Quercetin Picks ]

MegaFood, $29, 60 tablets, megafood.com // BioActive Nutrients GrapeSeed PLUS with Quercetin, $40, 120 capsules, bioactivenutrients.com // Solgar Quercetin Complex, $24, 60 capsules, solgar.com // Nature’s Plus Quercetin Plus, $23, 60 tablets, naturesplus.com