L-Tryptophan is an essential amino acid it is not synthesized by the body and must be obtained from the diet. NOW® L-Tryptophan is pharmaceutically pure and every lot is tested to be free of Peak E and microbial contamination.
L-Tryptophan is an essential amino acid important in human nutrition for the synthesis of melatonin and serotonin, hormones regulating mood and stress response. It also helps support relaxation, sleep, positive mood and immune function.