Amino acids are the building blocks of protein within the body. They are classified as either �essential� or �non-essential�. Essential amino acids cannot be made by the body, but instead must come from diet or supplementation. L-tryptophan is an essential amino acid that plays a part in creating both serotonin and melatonin. Foods that contain L-tryptophan include dairy, poultry and fish. This food supplement provides a 220mg dose of L-tryptophan within an easy-to-take vegan capsule. The amino acids within this supplement are presented in their free form state meaning they do not require digestion, resulting in a faster delivery into the body.