2023年1月11日，据欧盟食品安全局（EFSA）消息，应欧盟委员会要求，欧盟动物饲料添加剂和产品（FEEDAP）研究小组就赖氨酸硫酸亚铁（ferrous lysinate sulfate）作为所有动物饲料添加剂的有效性发表科学意见。

经过评估，专家小组无法就添加剂在断奶仔猪中的功效得出结论。部分原文报道如下：

Following a request from the European Commission, the Panel on Additives and Products or Substances used in Animal Feed (FEEDAP) was asked to deliver a scientific opinion on the efficacy of ferrous lysinate sulfate for all animal species. The safety of the additive for the target species, consumer, user and the environment has already been assessed previously, however the efficacy remained inconclusive due to limitations in the study with chickens for fattening. In the present assessment, the applicant submitted a new efficacy study in weaned piglets. After the assessment of the new data submitted by the applicant, the FEEDAP Panel could not conclude on the efficacy of ferrous lysinate sulfate in weaned piglets.