Methionine WHAT IS Methionine? Methionine (or L-methionine) is an antioxidant and essential amino acid found in food and supplemental form. It’s used by the body to make proteins and peptides. Methionine is readily available in protein rich foods such as; meat, fish and dairy products, as well as nuts and grains. Methionine supports the production of glutathione, arguably the body’s most important antioxidant, so is of considerable importance to the body’s natural detoxification processes. https://www.nationalnutrition.ca/amino-acids/single-aminos/methionine.html #methioninesupplement