Potassium nitrate

Potassium nitrate (KNO3), traditionally used in curing salts.

Curing agent in certain traditional meat products; gradually converted to nitrite.

Acts as a nitrite precursor in curing. Similar toxicological considerations as nitrites/nitrates.

Nitrosamine formation potential managed through formulation and limits. Combined nitrite/nitrate intake monitored.

Permitted only in specific traditional products listed in EU Annex II.

Potassium nitrate (saltpetre) is regulated in the U.S. alongside other curing agents under 21 CFR 172.175. It is permitted for specific meat-curing applications where nitrate converts to nitrite over time. U.S. cured-meat rules align with the EU principle of strict, product-specific limits rather than general use.

Strict category-specific limits in Annex II Part E.

0–3.7 mg/kg body weight per day (JECFA, as nitrate ion) — separate from nitrite ADI.