L-cysteine hydrochloride monohydrate (E921)
Updated October 2, 2026
L-cysteine hydrochloride monohydrate (E921) is a food additive in the “other additives” group. It appears in 62 products in our database, 2 of them sold in the US.
Quick facts
- Also known as
- E921
- E-number
- E921
- Function
- Other additives
- Found in
- 62 products (2 sold in the US)
Foods that commonly contain L-cysteine hydrochloride monohydrate
Share of published products in each category whose ingredient list includes L-cysteine hydrochloride monohydrate.
Popular products with L-cysteine hydrochloride monohydrate
NOVA 4 
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NOVA 4 How to spot L-cysteine hydrochloride monohydrate on a label
Look for any of these names in the ingredient list:
Related additives
Frequently asked questions
What foods contain L-cysteine hydrochloride monohydrate?
In our database, L-cysteine hydrochloride monohydrate most often appears in baby milks, baby milks in powder, dietary supplements and protein bars.
How many products contain L-cysteine hydrochloride monohydrate?
62 published products on Foodmetria list L-cysteine hydrochloride monohydrate, including 2 sold in the United States. Counts come from ingredient lists in Open Food Facts and update daily.
Product data: Open Food Facts (ODbL), updated daily. Additive information is for general education and is not medical advice. Always check the package label. Our methodology.