Amino acids are the basic material needed to constitute animal nutrition protein. Animals of the amino acids are L-shaped, so the animal feed L-amino acids can be a good use of some synthetic amino acids are D-type microorganisms also have D-type, for D-amino acids some animals can make good use of some relatively poor utilization. Methionine, cystine, glutamic acid, leucine, phenylalanine, proline and tyrosine either L or D-type, can be a good use of the animal, so now synthetic, added to feed is DL-methionine, and L-lysine. Amino acids in animal nutrition important role are: (1) material is a synthetic protein. (2) to participate in a variety of important physiological activities. (3) to provide energy. (4) is necessary for animal production. Product Description 1 Product name: L-Tryptophan 2. CAS No.: 73-22-3 3. Specification: CP2010 EP5 AJI92 USP24 4. White crystals or crystalline powder 5 Function: Ltyrosine, through its effect on neurotransmitters, is used to treat conditions including mood enhancement, appetite suppression