3rd Party Lab Tested for Purity & Quality.50 mg of 5-HTP per Capsule – 120 Capsules per Bottle.Non-GMO & Gluten Free.Proudly Made in USA, GMP Compliant, FDA Registered Facility.No Artificial Color, Flavor or Sweetener, No Preservatives, No Sugar, No Milk, No Corn, No Soy, No Egg, No Lactose, No Gluten, No Wheat, No Yeast, No Fish. Sodium Free.5-HTP (5-Hydroxytryptophan) is a naturally-occurring amino acid extracted from the seeds of Griffonia simplicifolia plant. It is a chemical precursor as well as metabolic intermediate in the biosynthesis of the neurotransmitters serotonin and melatonin from tryptophan. The mood enhancing action of 5-HTP is thought to be derived from its effect on the production of serotonin in the central nervous system tissue.