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L-Tryptophan can also be used to help prevent carbohydrate cravings. NRx L-Trytophan is USP 29 / USP (United States Pharmacopia),JP (Japanese Pharmaceutical) Grade and EP (European Pharmaceutical) . The minimum percentage must exceed 99% to qualify for this standard. NutraCeuticsRx Signature L-Tryptophan tested 99.6% Pure by HPLC (High performance liquid chromatography) . American Nutrition manufactures NutraceuticsRx products so that our customers have highest quality L-Tryptophan at half the price of a comparable product.. NutraceuticsRx L-Tryptophan the Choice of Doctors and Clinics. Best Selling L-Tryptophan L-Tryptophan Pages: NutraceuticsRx L-Tryptophan Bulk Powder - 100g $99.90 $49.95 Our Price NRx123 (BEST VALUE) TOP SELLER! Independently Tested For Purity! Peak E Free.   Quantity    NutraceuticsRx L-Tryptophan USP 500mg 120 Caps $49.90 $24.95 Our Price NRx98 TOP SELLER! Independently Tested For Purity! 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