What is it?Holland & Barrett Quercetin Plus Vitamin C contributes to the normal function of the immune system. Quercetin belongs to a group of plant pigments known as bioflavonoids.Supports The Immune System Helps to Reduce Tiredness and Fatigue Suitable For Vegetarians and Vegans What Are the Benefits of This Supplement?Vitamin C helps to support a number of bodily functions including the normal function of the immune system, normal energy yielding metabolism, normal functioning of the nervous system and normal psychological function. Vitamin C contributes towards normal collagen formation for the normal function of blood vessels, bones, cartilage, gums, teeth, and skin. Vitamin C also supports the protection of cells from oxidative stress, the reduction of tiredness and fatigue and increases Iron absorption. Holland & Barrett International Limited, Barling Way, CV10 7RH, UKHolland & Barrett Limited, 45 Henry St, D01 E9X8, Ireland