E920 — L-cysteine
E920 (l-cysteine) appears in the ingredient lists of 663 products sold in the United States.
Nutri-Score
583 rated products
Median values
| Calories | 252 kcal |
| Sugars | 2.7 g |
| Saturated fat | 3.1 g |
| Salt | 1.3 g |
Categories
Status in the United States (FDA)
Listed in the FDA inventory “Substances Added to Food”, with the regulations 21 CFR 172.320, 184.1271.
Technical effects listed by the FDA: dough strengthener, flavor enhancer, flavoring agent or adjuvant, flour treating agent, nutrient supplement
The inventory is a partial list, and a listing is not an FDA approval of every use; the regulations set the permitted uses.
U.S. Food and Drug Administration, Substances Added to Food (updated 9/8/2026), public domain · CAS 52-90-4 via Wikidata (CC0)
Products containing it, by country
Products listing this additive in each country edition of Shelfpedia (Open Food Facts data)
Products
663 products, most viewed first · page 1 of 14.
Source: Open Food Facts export of 23 October 2026, ODbL, and USDA FoodData Central, April 2026 release, CC0 · Shelfpedia calculations (medians, distributions).