There are more than 50 Amino Acids which have been identified by scientists and each is a little different. Amino Acids are used to build protein - protein helps to support the maintenance of muscle mass and normal bones. Although 50 amino acids have been identified, only 20 of them are used by the human body. Of these 20 amino acids, 9 are classed as essential amino acids, this means that the body cannot make them and they must be sourced from diet by eating protein rich foods. Lysine is one of these 9 essential amino acids. At Natures Aid, our l-Lysine tablets contain a full 1000mg L-Lysine. These tablets are suitable for vegans those following a vegan diet and are free from lactose, wheat and gluten.