L-Tryptophan 500 mg, 120 Vcaps, NOW FoodsNOW L Tryptophan Vegetarian Caps Supports Relaxation. Pharmaceutical Grade (USP). Encourages Positive Mood. Promotes Restful Sleep. L Tryptophan is an essential amino acid important in human nutrition for the synthesis of melatonin and serotonin, hormones regulating mood and synthesis of melatonin and serotonin, hormones regulating mood and stress response. L Tryptophan helps support relaxation, sleep, positive mood and immune function. As an
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