Doctors Best, L-Tryptophan With TryptoPure, 500 mg, 90 Veggie CapsProduct Description L tryptophan is an essential amino acid that the body cannot produce on its own and must be obtained through diet or supplementation. It plays a vital role in the production of serotonin, a neurotransmitter that supports mood balance, relaxation, and healthy sleep cycles. Product Benefits Helps Exert A Calming Effect. Supports Positive Mood And Restful Sleep. Dietary Supplement. Ingredients Supplement FactsServing Size: 1 Veggie