NOW Foods Supplements L-Tryptophan Powder Free-Form Supports Relaxation* Amino Acid 2-Ounce

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.