by Source Naturals

L-Tryptophan is an amazing essential amino acid.

Source Naturals brings you this pure essential amino acid that supports relaxation, restful sleep and a positive outlook. Helps in the synthesis of both melatonin and serotonin. A precursor to the kynurenines that regulate immunity, L-tryptophan also converts to niacin when the body needs it in order to support circulation, the nervous system and the metabolism of food.

Item: 51737 Size: 500 mg/120 capsules $19.59