L-Tryptophan powder, CAS No.73-22-3, essential amino acid manufactured by fermentation from carbohydrate sources, free of materials of animal origin. Uses: L-Tryptophan uses in food, protein powder, skin care cosmetics, drinks as supplement. L-tryptophan is used as an active ingredient in antidepressant therapy. Other uses of L-tryptophan include weight loss and reduction of PMS. Function: plays a key role in balancing sleep and mood patterns. As an experienced L-Tryptophan manufacturer and supplier, we has been supplying and exporting L-Tryptophan for almost 10 years, please be assured to buy from us. Any inquiries about price and the market trend please feel free to contact us, we will reply you within 1 working day. L-Tryptophan Specification ITEMS STANDARDs Appearance White crystals or crystalline powder Assay 98% Min Specific Rotation -29.0~ -32.3 Loss on Drying 0.5% Max Heavy Metals 20mg/kg Max Arsenic(As2O3) 2mg/kg Max Residue on ignition 0.5% Max