Vitamin C, also known as L-ascorbic acid, is an essential nutrient for higher primates and other minority organisms. Ascorbic acid can be produced by metabolism in most organisms, but human beings are the most notable exception. It is best known that vitamin C deficiency can cause scurvy. The effective group of vitamin C is ascorbic acid ion. In organism, vitamin C is an antioxidant, because it can protect the body from the threat of oxidants. Vitamin C is also a coenzyme.