21 CFR § 181.33
Sodium nitrate and potassium nitrate
June 25, 2020
Sodium nitrate and potassium nitrate are subject to prior sanctions issued by the U.S. Department of Agriculture for use as sources of nitrite, with or without sodium or potassium nitrite, in the production of cured red meat products and cured poultry products.
[48 FR 1705, Jan. 14, 1983]