Dietary SupplementL-Tryptophan is a natural building block of serotonin, the neurotransmitter that plays an important role in appetite, mood, normal sleep patterns, and nervous-system health.Dietary ConsiderationsWheat FreeDairy/ Milk FreeGluten FreeYeast FreeSugar FreePreservative FreeCorn FreeFree of Artificial Colors/FlavorsEgg FreeShellfish FreeNon-GMOServing Size:1 CapsuleServings Per Container:120Amount Per Serving L-Tryptophan (as TryptoGold) 500mg Other ingredients: Vegan capsule (plant-derived hypromellose, water) Directions: (Adults): Take one (1) capsule or as directed by your doctor. Best if taken at bedtime or between meals. Works best with full-spectrum B-vitamins and dietary carbohydrates. If tapering medication, use the Hunter Serotonin Toxicity Criteria, available online.No added gluten, yeast, wheat, rice, corn, soy, dairy, eggs, peanuts, fish, shellfish, sugar, artificial color, artificial flavor or preservatives. Non-GMO.Caution: Keep out of the reach of children. If you are pregnant, lactating, taking any medications or have a medical condition, consult your doctor. Discontinue use if adverse reaction occurs. Do not use if seal is damaged or missing. Keep lid tightly closed. Keep in a cool, dry, place.