据了解，这种L-胱氨酸是由菠萝泛菌 （Pantoea ananatis）菌株NITE BP‐02525发酵产生。经过评估，小组认为，这种添加剂对动物、消费者和环境是安全的，能部分有效地满足所有动物对含硫氨基酸的需求。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 l‐cystine produced using Pantoea ananatis NITE BP‐02525 when used as a nutritional additive （amino acid） or as a sensory additive （flavouring compound） in feed and water for drinking for all animal species. l‐Cystine is a dispensable sulfur‐containing amino acid, naturally occurring in proteins of plants and animals. The amino acid l‐cystine produced by fermentation with P. ananatis NITE BP‐02525 is safe for all animal species, if the requirements for sulfur‐containing amino acids are respected. The maximum amount of l‐cystine that can be safely added to the diet will depend on the levels of other sulfur amino acids. This conclusion would also cover its use as a sensory additive. The use of l‐cystine produced by fermentation with P. ananatis NITE BP‐02525 in animal nutrition raises no safety concerns to consumers of animal products. The additive under assessment is considered slightly irritating by inhalation, not irritating to the skin or eyes and is not a skin sensitiser.