LysineLysine is an essential amino acid that your body doesnt produce on its own, which means it must come from diet or supplementation. Primary dietary sources of lysine are meat, poultry, fish, dairy, tofu, lentils, and beans. However, because many individuals dont get enough lysine through diet alone, supplementation of this essential amino acid is advisable. Thornes Lysine uses the purest, most absorbable form of this amino acid without adding