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Typical source

Feathers, hair, or synthetic

Plain-language explanation

E920, or L-cysteine, is an amino acid commonly used as a dough conditioner and flour treatment agent to speed up baking and improve the texture of commercial breads and pastries. It is most frequently derived from human hair, duck feathers, or hog hair, though it can also be produced synthetically or through a microbial fermentation process. Because it is often sourced from pigs or from human hair—which is strictly prohibited in Islam—its halal status is highly doubtful and generally considered haram by major certification bodies like JAKIM, MUI, MUIS, ESMA, and HFA unless its specific origin is verified. The ingredient is only halal if it is conclusively proven to come from plant-based fermentation, synthetic production, or halal-slaughtered animals, which is quite rare in the food industry. Due to this high risk of impermissible sourcing, Muslim consumers are strongly advised to avoid products containing E920 unless they carry a reliable halal certification logo.