5-HTP is a metabolite of the essential amino acid L-tryptophan, a component of protein. Our bodies convert some dietary tryptophan into 5-HTP (5-hydroxytryptophan), for use in serotonin synthesis. The Mayo Clinic calls serotonin “a chemical your body produces that’s needed for your nerve cells and brain to function,” and serotonin also generates another well-known substance called melatonin, which the body produces at night to enable proper sleep cycles. 5-HTP not only helps us relax all day and sleep overnight, but also helps the body turn off unnecessary processes while sleeping to allow routine maintenance and repairs. The healthy serotonin and melatonin levels that 5-HTP supports can appropriately cycle down normal daytime bodily functions overnight, including adrenal stress hormones and stomach acid production. NOW performs extensive analytical testing to assure our food-derived 5-HTP’s purity, quality, and safety.