L-Lysine HCl is an essential amino acid that acts as a precursor for many substances created in the metabolic process, such as Carnitine. Hydrochloride (HCl) is added to help aid absorption. L-Lysine HCl may aid athletic performance, support healthy mood, and promote healthy hair and skin.** These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.