Each serving of Nutravita's Vegan Quercetin supplement contains 500mg of pure and natural Quercetin. Our Quercetin complex contains 80mg of vitamin c. Vitamin c contributes to the maintenance of a normal immune system and it contributes to the reduction of tiredness and fatigue as it increases iron absorption to help carry oxygen throughout the body. Our Quercetin complex also has added Acerola, bioflavonoids, Rosehip and Rutin which are naturally occurring compounds to enhance the action of Vitamin C. Nutravita Quercetin Complex with Vitamin C 120 Vegan Capsules in White