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NOW Foods L-Tryptophan is a source of an essential amino acid for the maintenance of good health. 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.Recommended Dosage: Adult Dosage: Take 1 capsule daily with meals.Caution: Consult a health care practitioner prior to use if you are pregnant or breastfeeding. Tryptophan supplementation should be avoided in depression with reversed diurnal variation. Patients with liver cirrhosis should avoid tryptophan supplementation.

Glutathione is a tripeptide amino acid produced in the liver primarily from cysteine. It acts as a cellular antioxidant by inhibiting free radical formation. Glutathione has been called the master antioxidant, because it recycles the antioxidants vitamins C and E and also helps to regulate immune cells and detoxify the body. 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 1968, NOW has been making top quality products that are tested to the highest standards to empower people to lead healthier lives. Now's promise - what is on the label, is precisely what is in the bottle. Recommended Dosage: Adult Dosage: Take 1 capsule daily with meals. breastfeeding or if you are currently taking any herbs or prescription medications. Discontinue use if gastrointestinal effects occur. Caution: Consult with a health care practitioner prior to use if you are pregnant or breastfeeding or if you are currently taking any herbs or prescription medications. Discontinue use if gastrointestinal effects occur.