L-Serine is a nonessential amino acid used in the biosynthesis of proteins that plays a part in a wide range of body functions. L-Serine combines with fatty acids to create phosphatidylserine which may support brain function.* It also converts into D-Serine, which may support the nervous system, and L-Serine is used by the body to create L-Tryptophan, a chemical that may support healthy sleep and mood.** 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.