L-Tryptophan is a large neutral amino acid essential to human metabolism because it is the metabolic precursor of serotonin (a neurotransmitter), melatonin (a neurohormone), and niacin (vitamin B3) which assist in the regulation of sleep, positive mood and immune function. L-Tryptophan is not synthesized by the body and must be obtained from the diet. Natural color variation may occur in this product. Our NOW natural and organic Supplements are an effective way to ensure you and your loved ones are getting essential vitamins, minerals and nutrients for daily optimal health. Since 2000, the NOW brand has been supporting Canadians with a mission to provide products that empower people to lead healthier lives. 70% of the NOW products in Canada are made or packaged in Guelph, Ontario, employing hundreds of Canadians from coast to coast. NOW performs 31,000 quality tests every month to ensure you get the highest quality supplements at the best price possible. Our promise - what is on the label, is precisely what is in the bottle.
