E224 — Potassium metabisulfite · page 3

Status in the United States (FDA)

Listed in the FDA inventory “Substances Added to Food”, with the regulations 21 CFR 182.3637.

Technical effects listed by the FDA: antimicrobial agent, antioxidant, color or coloring adjunct, dough strengthener, flour treating agent, oxidizing or reducing 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 16731-55-8 via Wikidata (CC0)