L-Tryptophan 220mgDescription 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 which promotes feelings of wellbeing, and melatonin, which promotes sleep. Foods that contain L tryptophan include dairy, poultry and