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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 function.* Every lot of NOW® L-Tryptophan is tested to be free of Peak E and microbial contamination. SUPPORTS RELAXATION*: Critical for the production of serotonin and melatonin, which help to support a positive mood, healthy sleep patterns, and proper immune system function.* ENCOURAGES POSITIVE MOOD*: Every lot is tested to be free of Peak E and microbial contamination. CLASSIFICATIONS/CERTIFICATIONS: Non-GMO, Vegan, Kosher GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratory/testing methods (for stability, potency, and product formulation). Packaged in the USA by a family owned and operated company since 1968. During the summer months products may arrive warm but Amazon stores and ships products in accordance with manufacturers' recommendations, when provided. UPC 733739002631 Color White Flavor Unflavored Diet Type Vegan Item Form Powder Brand Name NOW Foods Model Name NOW Supplements, L-Tryptophan Powder, Free-Form, Supports Relaxation*, Amino Acid, 2-Ounce Unit Count 2.0 Ounce Dosage Form Powder Item Weight 0.2 Pounds Manufacturer NOW Sports - Nutrition and Wellness Model Number 0263 Container Type Bottle Item Dimensions 2.25 x 2.25 x 4.38 inches Number of Items 1 Product Benefits Sleep Support, Stress Relief Material Features Vegetarian Special Ingredients Amino Acid Age Range Description Adult Primary Supplement Type multivitamin Manufacturer Part Number 0263 Specific Uses For Product Amino Acid Total Servings Per Container 57 Global Trade Identification Number 00733739002631