L-Tryptophan is an essential amino acid that must be obtained through diet because the body cannot produce it on its own. It plays an important role in the natural production of serotonin and melatonin, compounds involved in supporting healthy mood balance and normal sleep cycles. L-Tryptophan is commonly used as a supplement for overall wellness and relaxation support. Each batch is carefully tested for quality and purity, including screening for Peak E and microbial contamination.