Add to cart Vitamin C – 1000mg Powder R49.00 Vitamin C , also known as ascorbic acid, is a water-soluble vitamin, which is essential for normal functioning of the body. Unlike most mammals, humans do not have the ability to make their own vitamin C and, therefore, must obtain it through their diet Immune system. Vitamin C is vital for the function of the immune system and promotes resistance to infection. Antioxidant. Vitamin C is also a highly effective antioxidant. Antioxidants such as vitamin C act to protect your cells against the effects of free radicals, which are potentially damaging compounds produced as by-products of normal metabolism, as well as through exposure to toxins and pollutants (e.g. smoking). Free radicals can cause cell damage that may contribute to the development of cardiovascular disease and cancers, and other diseases.