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.
| Testing Item | Standard | Result |
|---|---|---|
| Assay/% | ≥99.00 | 99.18 |
| Loss on Drying/% | ≤0.30 | 0.10 |
| Chloride(NaCl)/% | ≤0.20 | 0.10 |
| Heavy Metal(Pb)/(mg/kg) | ≤20 | <20 |
| Arsenic(As)/(mg/kg) | ≤2 | <2 |



The dominant application for poultry and swine diets. It balances the amino acid profile, supporting maximum growth rates, improving feed conversion ratios (FCR), and enhancing breast meat yield in poultry.
Important for maintaining urinary tract health in cats. In aquaculture, it ensures balanced amino acid intake for fish and shrimp in intensive farming systems.
Used in clinical nutrition and parenteral solutions. It also serves as a starting material in the synthesis of other compounds and specific food fortification contexts.


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