E921No regulatory flags
L-cysteine hydrochloride monohydrate
Function: Food Additive
E921 is the European food-additive number for L-cysteine hydrochloride monohydrate. L-cysteine hydrochloride monohydrate (E921) is a food additive used as a food additive.
Is E921 safe or restricted?
E921 is an approved food additive in the EU and currently carries no special regulatory restrictions in the EU additive register. Forkin classifies it as “No regulatory flags” and does not make health claims. See the methodology for how regulatory levels are assigned.
Frequently asked questions about E921
- What is E921?
- E921 is the E-number for L-cysteine hydrochloride monohydrate. L-cysteine hydrochloride monohydrate (E921) is a food additive used as a food additive.
- Is E921 vegan or vegetarian?
- It depends on the source. Many additives can be produced from plant, mineral, or animal-derived raw materials, and the ingredient list rarely states which was used. The Forkin app shows the verified vegan and vegetarian status per product where it's known, instead of a blanket guess.
- Is E921 safe, and is it banned anywhere?
- E921 is an approved food additive in the EU and currently carries no special regulatory restrictions in the EU additive register. Forkin classifies it as "No regulatory flags" and does not make health claims — see the methodology page for how regulatory levels are assigned, and the Forkin app for the full profile, including acceptable daily intake (ADI) and restrictions by country.
See the full profile in Forkin
The Forkin app surfaces the full regulatory profile of E921 — acceptable daily intake (ADI), restrictions by country, vegan/vegetarian status, alternative names, and which products in your scan history contain it.