L-tryptophan is an essential amino acids 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 the United States Pharmacopeia USP standards. Supplement Facts Serving Size: 1 Cap Servings per Container: 90 Amount Per Serving 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 protein or amino acids.
