E221 — Sodium sulphite · page 2

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)