DL-methionine is a combination of the biologically active L-methionine and its optical isomer, D-methionine. D-methionine is not proteogenic, unlike L-methionine, however DL-methionine is less expensive to manufacture than isomerically pure L-methionine.
L-methionine is an essential amino acid and is a main component in structural proteins, and serves as a methyl donor in biochemical reactions. Methionine is an intermediate in the biosynthesis of L-cysteine, L-carnitine, taurine, lecithin, phosphatidylcholine, and other phospholipids, as well as the enzymatic cosubstrate, S-adenosyl methionine (SAM). Because L-methionine is an essential amino acid, it is not synthesized in the human body and must be supplied by dietary intake or supplementation.
L-methionine supplements, such as DL-methionine, are necessary for protein synthesis and provide support for healthy metabolic, central nervous and immune system function.
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