5-Hydroxytryptophan is the precursor to serotonin, a mood and appetite regulating neurotransmitter produced within the body. It has been combined with Vitamin C and Vitamin B6, an important cofactor in the conversion to serotonin. Nature's Way uses natural 5-HTP extract from Griffonia simplicifolia beans produced in easy-to-swallow, enteric-coated tablets to minimize any potential gastric discomfort.Suggested Use:Use under the guidance of a healthcare practitioner. Start with a low dose of one tablet (50mg) taken daily with a meal. Increase the dose slowly (every 3-5 days) up to a maximum of four tablets taken daily (200mg). Total daily intake should be divided into two or more doses, with no more than two tablets per dose.Product Facts:Serving Size: 2 tablets Servings Per Container: 30 Vitamin C - 120mg (ascrobic acid) Vitamin B6 - 20mg (as pyridoxine HCI) 5-HTP - 100mg (1-5-Hydroxytryptophan) Other Ingredients Cellulose, Maltodextrin, Modified cellulose gum, stearic acid, silica, aqueous coating solution.