Vitamin C is not produced naturally by the body, so must be obtained through the diet or supplements. As it is a water soluble vitamin, it passes out of the body in the urine, meaning the body's stores must be replenished often. Vitamin C (also known as ascorbic acid) plays several important roles in the body. It is required for the growth and healthy function of all cells in the body, it contributes to the normal function of the immune and nervous systems and it helps iron to be absorbed into the bloodstream. As a natural antioxidant, Vitamin C may also help to protect DNA, lipids and proteins from oxidative free radical damage. Holland & Barrett stocks a wide range of Vitamin C supplements, from effervescent tablets to powder for those who struggle with tablets, to formulations that include complimentary nutrients like iron and zinc that work in harmony with Vitamin C.