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, Effect of multi nutrient insufficiency on markers of one carbon metabolism in young women: response to a methionine load European Journal of Clinical Nutrition 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 What is Glutathione Glutathione Reporter