Sodium Nitrite (E250)
Sodium nitrite is a preservative that protects processed meats against potentially fatal botulism and gives meat its pink colour. However, in the stomach and during high-temperature cooking it can turn into carcinogenic nitrosamines; the IARC, part of the World Health Organization, has classified processed meat as carcinogenic to humans (Group 1). For this reason it is advisable not to eat nitrite-containing products regularly and in large amounts.
Risk range
1 is the lowest and 10 the highest risk. The range depends on the amount used, whether the product is rinsed off and how it is used. The Temiz İçerik app uses the same ranges.
The range is high because nitrite is an integral part of processed meat products, which are recognised as carcinogenic; the upper end reflects frequently eaten products cooked at high temperatures, such as grilled or fried.
What is sodium nitrite and what does it do?
Sodium nitrite is a salt used in curing meat (salting and maturing it). In food it has three jobs: preventing the bacterium Clostridium botulinum from growing and producing toxin, giving meat its familiar pinkish-red colour, and creating its characteristic “cured” flavour.
Botulinum toxin is one of the most potent poisons known and can develop in meat products stored without air. This is the main reason nitrite is still used today: regulators weigh this microbiological risk against the chemical risk of nitrite and permit its use in limited amounts. Potassium nitrite (E249) and nitrates (E251, E252) are also used for the same purpose; nitrates gradually turn into nitrite in the product.
Which products contain it?
- Cured sausages such as sucuk, salami, frankfurters and ham
- Smoked meat, canned braised meat and deli meats
- Pastırma (cured dried beef) and similar dried meat products (may contain nitrite or nitrate)
- Some fish and cheese products (nitrates)
On the label it appears as “preservative (sodium nitrite)” or “preservative (E250)”. Products “with no added nitrite” may use natural sources of nitrate such as celery powder; because these also turn into nitrite in the product, the result is chemically similar.
Is it harmful? The scientific assessment
In its 2015 assessment, the IARC classified processed meat as Group 1 (carcinogenic to humans) and red meat as Group 2A (probably carcinogenic). The evidence relates mostly to colorectal (bowel) cancer. This classification reflects the strength of the evidence, not the size of the risk; in other words, it does not mean processed meat is as dangerous as smoking, but it does show that the link has been firmly established.
Nitrite's role in this picture is that it can react with amines in meat to form N-nitroso compounds (nitrosamines). This reaction can take place both in the stomach and when the product is fried or grilled at high temperatures. The IARC also classifies ingested nitrite and nitrate under conditions that result in nitrosation in the body as Group 2A.
EFSA has re-evaluated the use of nitrite at permitted levels and stated that nitrosamines in food raise a health concern. The EU and the Turkish Food Codex, which is aligned with it, permit nitrite only in certain products and within maximum limits.
Who should be careful?
- People who eat processed meat every day: A routine such as sucuk at breakfast and a hot dog at lunch increases the risk; eating it less often is the most effective step.
- Children: Salami and frankfurters are often chosen for school lunches; cheese, eggs or home-made meat dishes can be considered instead.
- Babies: High nitrate and nitrite intake can impair the oxygen-carrying capacity of the blood in babies; processed meat is not suitable for feeding babies.
What to do when you see it on a label
Eating a product containing E250 once is not dangerous; what matters is how often and how much. Not cooking sucuk and sausages at very high temperatures until they are charred reduces nitrosamine formation. Many manufacturers add ascorbic acid (vitamin C) or ascorbate to limit nitrosamine formation. Treating processed meat as an “occasional” food and meeting your protein needs with fresh meat, fish, eggs and pulses is in line with the general advice of health organisations.
Frequently asked questions
Would it be safer not to use nitrite at all?
Not exactly. Without nitrite, the risk of botulism in processed meats rises considerably. That is why regulators limit the amount rather than banning it.
Is “nitrite-free” sucuk healthier?
If it contains natural nitrate sources such as celery powder, the product still forms nitrite. Moreover, the risk of processed meat does not come from nitrite alone.
Is the nitrate in vegetables harmful too?
Green leafy vegetables naturally contain nitrate; however, these vegetables come with vitamin C and antioxidants and are part of a healthy diet. They are not assessed in the same way as processed meat.
How much processed meat can I eat per week?
There is no definite threshold considered safe; health organisations recommend eating as little as possible. You can ask your dietitian about your personal situation.
Sources
Updated: 2026-10-11 · How we score
This page is for general information and is not personal medical advice. Warnings on the product label and the advice of a health professional always come first.