StacksVerified U.S. regulatory reference

21 CFR §172.350

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Fumaric acid and its calcium, ferrous, magnesium, potassium, and sodium salts may be safely used in food in accordance with the following prescribed conditions:
  1. (a)The additives meet the following specifications:
    1. (1)Fumaric acid contains a minimum of 99.5 percent by weight of fumaric acid, calculated on the anhydrous basis.
    2. (2)The calcium, magnesium, potassium, and sodium salts contain a minimum of 99 percent by weight of the respective salt, calculated on the anhydrous basis. Ferrous fumarate contains a minimum of 31.3 percent total iron and not more than 2 percent ferric iron.
  2. (b)With the exception of ferrous fumarate, fumaric acid and the named salts are used singly or in combination in food at a level not in excess of the amount reasonably required to accomplish the intended effect.
  3. (c)Ferrous fumarate is used as a source of iron in foods for special dietary use, when the use is consistent with good nutrition practice.