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 first-limiting essential amino acid in poultry and critical in swine diets. It balances the amino acid profile for optimal protein synthesis, supports growth rates, and improves feed conversion ratios (FCR).
Important for maintaining urinary tract health in cats and ensuring balanced amino acid intake for fish and shrimp species in intensive farming systems.
Used in clinical nutrition, parenteral solutions, and as a starting material in the synthesis of other compounds and specific food fortification.


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