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Methionine is an essential amino acid, the basic building blocks from which proteins in the body are constructed. Methionine cannot be produced in the body, and must be obtained from the diet or via supplementation; dietary sources include meat, fish, milk, cheese, peanuts and whole lentils. Significant losses of methionine may occur during food processing. Methionine supplementation of vegetarian diets may be appropriate in some cases.Methionine supports a normal metabolism and growth. In addition to helping maintain protein formation, methionine may support formation of:Antioxidants protecting the body against free radicalsChemical messengers responsible for normal brain functionCartilage components in joints. In addition, methionine promotes healthy liver function, including detoxification.