National Food Safety Standard - Food Nutrition Fortifier L-Methionine (L-Methionine) (GB 1903.74—2025).

This Food Safety National Standard for Food Nutrition Fortifier L-Methionine (L-Methionine) (GB1903.74-2025), issued by China's National Health Commission and State Administration for Market Regulation, applies to L-Methionine used as a food nutrition fortifier. It specifies the chemical name, molecular formula, structure, relative molecular mass of L-Methionine, and sensory and physicochemical requirements, including purity, pH, and lead content. It also details testing methods for these parameters.