The amino acid L-5-Hydroxytryptophan (5-HTP) is created from L-Tryptophan in the body, and is a precursor to serotonin and melatonin. Our 5-HTP is derived from a plant source, and is carefully tested to ensure its purity and to guarantee the absence of contaminants. Serving Size: 1 Vegetable Capsule Servings Per Container: 150 Amount Per Serving: 5-L-Hydroxytryptophan Other Ingredients: Hydroxypropyl methylcellulose, microcrystalline cellulose, L-leucineAs a dietary supplement, 1 capsule one to three times daily, or as directed by a healthcare practitioner.Not indicated for pregnant or nursing women. Concurrent use with SSRI medications or MAO inhibitors should only be done under the guidance of a healthcare professional.Variations in product color may occur. Keep in a cool, dry place, tightly capped.