Sodium Nitrite E250
inorganic — Primarily synthetic.
Sodium nitrite
CAS: 7632-00-0
Factual Regulatory Reference
This database provides factual regulatory information compiled from official government sources. It does not constitute medical, nutritional, or safety advice. Regulatory status varies by country and is subject to change. Always refer to your local regulatory authority for the most current information.
What Is Sodium Nitrite?
Sodium nitrite (E250) is a synthetic inorganic salt used as a curing agent and color fixative in processed meats; it reacts with myoglobin to produce the characteristic pink color of bacon, ham, and hot dogs, and provides antimicrobial protection against Clostridium botulinum, the bacterium responsible for botulism. It is produced industrially by reacting nitric acid with sodium hydroxide or sodium carbonate, and is universally approved worldwide for use in cured meats under strict residual limits — EFSA and JECFA established a group ADI of 0.07 mg/kg body weight per day for the nitrite ion. Sodium nitrite is the subject of ongoing regulatory attention because it can form carcinogenic N-nitrosamines when heated at high temperatures; IARC's 2015 classification of processed meat as a Group 1 carcinogen identified nitrite as a contributing factor, leading regulators including the EU (EFSA 2017) to emphasize limits on residual levels and to require the co-addition of ascorbic acid or sodium erythorbate as nitrosamine inhibitors.
? Did You Know?
Beyond food, Sodium Nitrite is also used in medicine, industrial applications. Its versatility makes it one of the most multi-purpose chemical compounds in everyday life.
To reach the Acceptable Daily Intake limit, a 60kg adult would need to consume approximately ~5-6 slices of bacon (15g each) in a single day. (This is a mathematical illustration, not a safety recommendation.)
Regulatory Analysis
Sodium nitrite represents the most genuine regulatory dilemma in food safety: a substance classified as contributing to IARC Group 1 carcinogenicity when present in processed meat, yet retained universally because the acute lethality of Clostridium botulinum toxin outweighs the chronic cancer risk from nitrosamine formation. No major regulatory authority has found a way to resolve this trade-off, and the 1978 US mandate to co-add ascorbic acid as a nitrosamine inhibitor represents a rare case of regulators engineering a chemical mitigation rather than choosing between approval and prohibition. The emergence of 'uncured' products using celery powder -- which delivers identical nitrate chemistry under a natural label -- further illustrates how regulatory categories can diverge from biochemical reality.
Detailed Regulatory Assessment
European Union (EFSA)
STRICTLY REGULATED; maximum residual levels enforced; often combined with ascorbic acid/erythorbate to reduce nitrosamine formation
Official EFSA LinkUnited States (FDA)
Ingoing amount: typically 120-200 ppm; must be used with sodium/potassium erythorbate or ascorbate to inhibit nitrosamine formation
Japan (MHLW)
Strict limits enforced; residual limits similar to EU standards
Acceptable Daily Intake (ADI)
International Standard (JECFA)
mg/kg body weight per day
European Standard (EFSA)
Everyday Perspective
For a 60kg adult, this limit is roughly equivalent to consuming:
Natural Occurrence
This additive is not known to occur naturally in significant quantities.
Manufacturing
Produced industrially by reacting nitric acid with sodium hydroxide or sodium carbonate, followed by neutralization and crystallization.
Applications Beyond Food
Vasodilator in some medical applications; antidote for cyanide poisoning
Used in metal treatment, dye production, and as corrosion inhibitor