L-Methionine is an essential amino acid that is commonly found in meat, fish, and dairy products. It is also available as a dietary supplement and is used in the production of various pharmaceuticals, such as anti-inflammatory drugs and liver-protective agents. L-Methionine plays a vital role in protein synthesis and is involved in the formation of other important compounds in the body, such as creatine, carnitine, and taurine. It is also a precursor to the antioxidant glutathione, which helps to protect cells from damage caused by free radicals.