Ascorbic acid is the technical name given to vitamin C, a natural water-soluble vitamin. It plays an important role in the function of the immune system during and after exercise, energy production, and the nervous system. It also helps to maintain the health of the skin, blood vessels, bone and cartilage, increase the absorption of non-haem iron, reduce tiredness and fatigue, maintain normal psychological function, and is a potent antioxidant.