E920 MUSHBOOH

L-Cysteine, identified as E920, is an amino acid used in industrial baking to break down gluten proteins, making dough more extensible and reducing processing time. It is one of the most controversial additives in Halal science due to its sourcing history.

While it can be produced through the fermentation of botanical sugars (Halal) or from duck feathers (Mushbooh/Haram depending on Zabiha status), it was historically extracted from human hair. According to Islamic jurisprudence, the use of any part of the human body in food is strictly Haram (impermissible) due to the sanctity of the human being.

Most modern European and North American suppliers have shifted to synthetic or feather-based sources, but without explicit transparency or Halal certification, the origin remains doubtful. Using the Tayib app is essential to verify if a bakery brand utilizes the high-cost synthetic version or a cheaper, problematic animal-derived variant, ensuring your daily bread remains pure.