E221 — Sodium sulphite

Status in the United States (FDA)

Listed in the FDA inventory “Substances Added to Food”, with the regulations 21 CFR 73.85, 173.310, 182.3798.

Technical effects listed by the FDA: antioxidant, color or coloring adjunct, dough strengthener, flour treating agent, formulation aid, oxidizing or reducing agent, ph control agent

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 7757-83-7 via Wikidata (CC0)