Homocysteine and methionine are key amino acids with a vital connection to glutathione one of your body's most important substances! Methionine is abundant in many foods, so protein isn't the culprit, Managing Competing Interests: Partitioning S between Glutathione and Protein Synthesis Plantae 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 Frontiers Pathological role of methionine in the initiation and progression of biliary atresia Glutathione Synthesis Explained: How Your Body Builds Its Master Antioxidant OrganiClinic What is L Methionine? Benefits and Properties HSN Blog