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Description:The essential amino acid L-tryptophan helps support relaxation, restful sleep, and feeling better. 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.Nutrition Facts:Serving Size (caps) 3Servings Per 15L-Tryptophan (g) 1.5Ingredient Details:gelatin (capsule), colloidal silicon dioxide, and magnesium stearate.Suggested Use:1 capsule 3 times daily, between meals and preferably with fruit juice. To support restful sleep, take 3 capsules before bed.Warnings:If you are pregnant, breastfeeding, may become pregnant, or are taking medications such as SSRI's or MAOI's consult your health care professional before using this product. These statements have not been evaluated by the Food and Drug Administration (FDA). This product is not intended to diagnose, treat, cure or prevent any disease.