Is L-Cysteine Halal?

What is L-cysteine?

L-cysteine is an amino acid, one of the small building blocks of protein. Bakeries add it to dough to make it softer and to speed up baking. It also adds flavor to some foods. You will find it mostly in bread, buns and other baked goods. On labels in some countries, it is listed as E920.

Where does L-cysteine come from?

L-cysteine can come from three sources:

• A lab. It can be made by fermentation or by chemical methods. This version is halal.
• Duck or chicken feathers. This is the most common commercial source. Many scholars accept L-cysteine made from feathers, although some prefer to avoid it.
• Human hair. Some factories have used human hair. Scholars consider this not permissible, because using parts of the human body in this way is not allowed.

Why is L-cysteine doubtful without confirmation?

The label only says "L-cysteine" or "E920." It never tells you the source. Because one possible source, human hair, is not permissible, L-cysteine with no source listed is treated as doubtful. It becomes acceptable once the company confirms it is made in a lab or from feathers, or once the product is halal-certified.

Common questions

Is L-cysteine halal?

It depends on the source. Lab-made L-cysteine is halal, L-cysteine from feathers is widely accepted, and L-cysteine from human hair is not permissible.

Why is E920 in bread a concern?

The label does not say where it comes from, and it could come from human hair. So it cannot be confirmed as halal without certification or a statement from the company.

Which breads avoid L-cysteine?

Breads with short, simple ingredient lists, and many organic or sprouted breads, do not use E920 at all.

Is L-cysteine used in fast food?

It is often used in commercial buns and baked goods. If you are unsure, ask the restaurant or check the bakery's ingredient list for L-cysteine or E920.