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Doctor's Best L-Tryptophan , Helps Sleep, Healthy Mood & Behavior, Non-GMO, Vegan, Gluten & Soy Free, Veggie Caps, Promotes Normal, Healthy Restful Sleep, 90 Count Calcium For customers who may beFeatures: DOCTORS BEST L TRYPTOPHAN contains L Tryptophan an essential amino acid (protein building block) that is not synthesized by the body and must be obtained in the diet or supplementation. It is also essential in the production of niacin, which is then metabolized into serotonin and melatonin in the brain. These neurotransmitters exert a calming effect for a better cognitive focus, encourages a positive mood, and a normal restful sleep.