2013年5月22日,欧盟委员会发布法规(EU) No 469/2013:批准DL-蛋氨酸(DL-methionine), DL-蛋氨酸钠盐(DL-methionine sodium salt),蛋氨酸羟基化合物(hydroxy analogue of methionine),羟基蛋氨酸钙(calcium salt of hydroxy analogue of methionine),异丙基羟基蛋氨酸(isopropyl ester of hydroxy analogue of methionine),乙烯基吡啶/苯乙烯包裹的DL-蛋氨酸(DL-methionine protected with copolymer vinylpyridine/styrene)和乙基纤维素包裹的DL-蛋氨酸(DL-methionine protected with ethylcellulose),可作为饲料添加剂。