L-Tryptophan from Now is an essential amino acid that contributes to good health. L-tryptophan is a precursor of serotonin, melatonin and niacin, which help regulate sleep and balance mood.
L-Tryptophan from Now is an essential amino acid that contributes to good health. L-tryptophan is a precursor of serotonin, melatonin and niacin, which help regulate sleep and balance mood.