Amazon.com: Pure Encapsulations L Methionine Glutathione and Amino Acid Supplement for Joints, Liver and Pancreas Support, Antioxidants, and Nervous System* 60 Capsules : Health & Household protein synthesis protein intake. you can eat a pound of steak and only ~32% of those amino acids actually become new protein in your body. the rest gets converted to glucose DL methionyl DL methionine as an efficient methionine source for promoting zootechnical performance and methionine related pathways in the whiteleg shrimp (Penaeus vannamei) British Journal of Nutrition Cambridge Core Nutritional Influences on Methylation Springer Nature Link