L-Tryptophan, CAS No. 73-22-3, is an essential amino acid that plays an important role in maintaining a healthy lifestyle. With its excellent advantages and application range, L-Tryptophan has become a popular chemical in various industries. Essentially, L-tryptophan is an essential amino acid, meaning it cannot be synthesized by our bodies and must be obtained through dietary sources. As a precursor to two important neurotransmitters, serotonin and melatonin, L-tryptophan is involved in many physiological processes such as mood regulation, sleep regulation and immune function.