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, or the guide to how EU additives are approved, re-evaluated and banned.
Is E921 vegan or vegetarian?
L-cysteine hydrochloride monohydrate (E921) can be produced from plant, mineral, or animal-derived raw materials, and the ingredient list rarely states which source was used — so its vegan status genuinely depends on the specific product.
The production source can vary between manufacturers — the Forkin app shows the verified vegan and vegetarian status per product. Always read the label for allergens.
Which foods contain E921?
E921 appears in 298 of the 4.7 million products in Forkin's catalogue — most often in frozen pizza, pizza and tortilla / wrap.
- Frozen Pizza44
- Pizza34
- Tortilla / Wrap22
- Bread11
- Wraps & Burritos11
- Sandwiches11
- Frozen Meals8
- Dietary Supplements6
Often appears alongside
Additives most frequently found in the same ingredient lists as E921 across the catalogue.
Counts reflect Forkin's independently enriched product catalogue and update as new products are added — they are not a market-share statistic.
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.
- Which foods contain E921?
- E921 appears in 298 of the 4.7 million products in Forkin's catalogue — most often in frozen pizza, pizza and tortilla / wrap. Scan any barcode with the Forkin app to see instantly whether a specific product contains it.
- Is E921 vegan or vegetarian?
- L-cysteine hydrochloride monohydrate (E921) can be produced from plant, mineral, or animal-derived raw materials, and the ingredient list rarely states which source was used — so its vegan status genuinely depends on the specific product. The Forkin app shows the verified vegan and vegetarian status per product, since the source can vary between manufacturers.
- 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. See view pricing.