* Since 1947 * With Ester-C Plus * Unique Synergistic Formula * Natural Seasonal Support * Gluten, Wheat & Dairy Free * Suitable for Vegetarians * Kosher Parve * Dietary Supplement Solgar"s Quercetin Complex includes the important bioflavonoid Quercetin in a synergistic formula with Ester-C Plus and Bromelain to provide unique antioxidant protection as well as natural seasonal support. Quercetin is found in onions and other foods. It possesses antioxidant membranes. Ester-C Plus provides a patented, pH neutral (non acidic), form of vitamin c that is gentle on the stomach. Ester-C Plus offers the additional benefits of incorporating acerola berry, citrus bioflavonoids, rutin and rose hips. This formula also features bromelain, a natural enzyme derived from pineapple.