E920 — L-cysteine · page 6

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)