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L-tryptophan is an essential amino acid protein building block in human nutrition. Essential amino acids are not synthesized by the body and must be obtained in the diet. The L-tryptophan in this product is manufactured and tested for purity according to United States Pharmacopeia USP standards. Vitamin B6 is an essential cofactor in the conversion of tryptophan, while niacinamide plays an important role in allowing our body to properly utilize this essential amino acid. Supplement Facts Serving Size: 1 Cap Servings per Container: 90 Amount Per Serving Niacin as niacinamide 20 mg Vitamin B6 from 17.6 mg pyridoxal 5-phosphate 10 mg L-Tryptophan 500 mg Other Ingredients: Cellulose, modified cellulose vegetarian capsule. Free Of Suitable for Vegetarians. Contains nothing other than listed ingredients. Directions: Take 1 or 2 capsules daily or as directed by a health practitioner. For optimum absorption, take separately from protein-containing foods and dietary supplements containing prote

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