🇬🇧 Article

Is L-Cysteine (E920) Halal?

What is L-cysteine?

L-cysteine (E920) is an amino acid used as a dough conditioner in bread, buns and pastries. It can be produced from human hair, animal feathers or bristles, or by bacterial fermentation / synthesis.

Why is its halal status uncertain?

The source is the problem:

• Synthetic or plant-fermented — halal.
• Animal feathers — doubtful, depending on the animal and slaughter.
• Human hair — most scholars consider using human-derived ingredients impermissible.

The label only says "L-cysteine" or "E920", never the source.

So, is it halal or not?

Because the origin is hidden, a precaution-first approach treats E920 as doubtful unless the product is certified halal or confirmed to use synthetic/plant-based L-cysteine.

How to check L-cysteine before you eat

• Look for a halal certification on bread and bakery products.
• Contact the manufacturer about their L-cysteine source.
• Choose products that don't list E920 / L-cysteine.

Let Qoot check it for you

Qoot scans a barcode and flags doubtful additives like L-cysteine instantly. Qoot is launching soon. Join the waitlist.

This article is for general information and is not a religious ruling (fatwa). For specific cases, consult a qualified scholar.