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Product Description: (T) Best L-Tryptophan, Doctor's Best, 500 mg, 90 Veggie Caps ? USP Pharmaceutical Grade ? Science-Based Nutrition ? Suitable for vegetarians ? Dietary Supplement Additional Information: 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 the United States Pharmacopeia (USP) standards.* Suggested Use: 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.