Quercetin is a plant derived flavonoid found in fruits, vegetables, leaves & grains. Several studies have shown that quercetin may have anti-inflammatory & anti-oxidant properties. Dietary Supplement Bioactive Bioflavonoid Easy to Swallow Capsules Vegetarian & Kosher Capsules Olympian Labs Incorporated - Since 1992 Olympian Labs Guarantee: Olympian Labs guarantees that all OL products are of the highest quality ingredients and lab assayed to ensure that what we say on the label is actually in the product. All Olympian Labs products are free from most allergens such as corn, yeast, barley, gluten, wheat, soy, lactose, all milk products, citrus, fish, egg products, as well as added flavoring sugars, sweeteners, salt, preservatives, salicylates, and artificial colors and coatings. When you buy an Olympian Labs product, you can be sure you are buying the best.