One of the exciting supplements showing benefits in human studies is quercetin. Quercetin is a natural compound that is found in plants. Quercetin is a pigment that belongs to unique plant compounds known as flavonoids. Food examples include apples, onions, green tea, berries, olive oil, red wine, citrus fruits, and green leafy vegetables.
As a supplement, quercetin is often recommended for allergies and inflammatory factors. Research has demonstrated that quercetin has antioxidant, anti-inflammatory, anti-tumor, and antiviral activity.