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Now Foods, L-Tryptophan Powder, 2 oz (57 g) Pet Health This unique Cordyceps is increasinglySupports Relaxation Encourages Positive Mood Promotes Restful Sleep Non GMO A Dietary Supplement Vegetarian Vegan Amino Acids Family Owned Since 1968 GMP Quality Assured L Tryptophan is an essential amino acid; therefore, it is not synthesized by the body and must be obtained from the diet. L Tryptophan is critical for the production of serotonin and melatonin, which help to support a positive mood, healthy sleep patterns, and proper immune system