Source Naturals - L-Tryptophan 500 Mg - 120 Tablet Immune Health When sufficient Nitric Oxide is

When sufficient Nitric Oxide is present

vitamin D3 (cholecalciferol from lichen)

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Source Naturals - L-Tryptophan 500 Mg - 120 Tablet Immune Health When sufficient Nitric Oxide isDietary Supplement Mood, Relaxation, Sleep Non GMO Validated The essential amino acid L tryptophan helps support relaxation, restful sleep, and feeling better. It plays a part in the synthesis of both melatonin and serotonin, hormones involved with mood and stress response. L Tryptophan also supports immune functions because it is the body's precursor to the kynurenines that regulate immunity. If needed, L tryptophan converts to niacin in the body,