E920: L-cysteine
Flour treatment agent. Origin: Plant or animal (varies by manufacturer).
Vegan
Depends on the source
Halal
Mushbooh (doubtful)
The honest version
Historically made from feathers, hog hair or human hair; increasingly made by fermentation. The label never says which, which keeps it on every certifier’s question list.
When our checker meets E920 on a label, it does not guess: products carrying ambiguous additives get a “check the label” verdict, with the ingredient named, so you can decide or ask the manufacturer.
Related additives
Classifications reflect common manufacturing practice and mainstream certifier positions; individual products and certifiers can differ. Not medical, nutritional or religious advice.