SOURCE NATURALS L-Tryptophan 500 Mg Tablet, 60 Count Package Quantity:1 | Size:60 Tablets The essential amino acid L-tryptophan helps support relaxation, restful sleep, and positive mood. It plays a part in the synthesis of both melatonin and serotonin, hormones involved with mood and stress response. L-Tryptophan also supports immune functions because it is the body's precursor to the kynurenines that regulate immunity. If needed, L-tryptophan converts to niacin in the body, which supports circulation, a healthy nervous system, the metabolism of food, and the production of hydrochloric acid for the digestive system. Source Naturals L-Tryptophan is extremely pure and is regularly tested to ensure the highest standards of quality. Features: The essential amino acid L-tryptophan is the precursor of two natural compounds of great importance. It produces melatonin in the body to support natural, restful sleep. Supports serotonin production for positive outlook and good mood. Also converts to niacin in the body when necessary, which helps metabolize food. Melatonin is a hormone and regulates the bodys wake and sleep cycle. Serotonin is a neurotransmitter and is involved with mood and stress response. Standardized extract yields 90% proanthocyanidins and organic acids. Product Details: Product Dimensions: 1.3 x 1.3 x 1.6 inches ; 1.6 ounces Shipping Weight: 2.4 ounces Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues. International Shipping: This item is not eligible for international shipping. Learn More UPC: 021078019794 Item model number: SN1979