DL-Methionine is a synthetic, racemic mixture of the essential amino acid methionine, containing both the D- and L-isomers. It appears as a white crystalline powder with a characteristic sulfurous odor. While only the L-form is biologically active in protein synthesis, animals (particularly poultry and swine) possess the metabolic ability to convert the D-form to the L-form. It is a critical source of sulfur and methyl groups in metabolism and is primarily utilized as a key nutritional supplement to optimize growth, feed efficiency, and animal health in modern agriculture.

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