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 The Glutathione System: A New Drug Target in Neuroimmune Disorders Molecular Neurobiology Springer Nature Link 13: Metabolism of Methionine & Cysteine Amino Acids Metabolism Biochemistry N'JOY Biochemistry Homocysteine: Diagnostic Significance and Clinical Insights Advanced Health Academy