13: Metabolism of Methionine & Cysteine Amino Acids Metabolism Biochemistry N'JOY Biochemistry Glutathione Synthesis Explained: How Your Body Builds Its Master Antioxidant OrganiClinic Fat burning is not always the problem. Sometimes the issue is detox capacity. When you move into a carnivore or animal based diet, the body relies heavily on a pathway called transsulfuration. 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,