The essential amino acid L-Tryptophan contributes to relaxation, restful sleep and a positive mood. It plays a role in the synthesis of melatonin and serotonin, hormones involved in mood, stress response and sleep/wake cycles.

L-Tryptophan also supports immune functions as it is the precursor to kynurenines which regulate immunity. When needed, L-Tryptophan converts to niacin in the body, which supports circulation, a healthy nervous system, food metabolism, and the production of hydrochloric acid for the digestive system.