Potassium lactate
The potassium salt of lactic acid, used to control acidity, slow bacterial growth, and extend shelf life in meat, fish, and ready meals.
What is it?
Potassium lactate is the potassium salt of lactic acid, a naturally occurring organic acid produced during fermentation. Lactic acid forms when bacteria ferment sugars in milk, vegetables and meat; potassium lactate is made commercially by neutralising lactic acid with potassium hydroxide or potassium carbonate. It appears as a clear, syrupy liquid or a white powder.
What does it do?
It works in two main ways. As an acidity regulator it buffers the pH of food, keeping it stable and slightly acidic, which slows the chemical reactions that cause rancidity and off-flavours. As an antimicrobial agent it lowers the water activity of the food, making it harder for spoilage bacteria and pathogens such as Listeria to survive. In meat products it also acts as a flavour enhancer and helps retain moisture, reducing cooking loss.
Where you will see it
Most commonly found in processed and cured meats such as cooked ham, bacon, sausages, pate, and sliced deli meats. Also used in ready-to-eat meals, marinated fish, soups, and some dairy-based sauces. On ingredient labels it appears as Potassium lactate or E326.
What the science says
Antimicrobial action in processed meat
Studies in food safety science consistently show that potassium lactate inhibits Listeria monocytogenes, Salmonella, and other pathogens in ready-to-eat meat products. This is the primary reason it is used commercially. The effect comes from reduced water activity rather than any chemical toxicity to humans. Regulatory bodies and food scientists treat this as an established, well-characterised mechanism.
Potassium lactate significantly reduced Listeria monocytogenes counts in cooked, ready-to-eat meat products stored at refrigeration temperatures.
EFSA's Scientific Panel on Food Additives and Nutrient Sources (ANS) reviewed lactic acid and its salts, including potassium lactate, and found no safety concern at levels used in food.
Potassium intake and diet
Potassium lactate contributes a small amount of potassium to food. For the general population this is not a concern and potassium is an essential mineral. However, people with kidney disease who need to limit their potassium intake should be aware that processed meats using this additive will add to their dietary potassium load. Amounts from normal food use are small compared with naturally potassium-rich foods such as bananas or potatoes.
People with chronic kidney disease requiring a low-potassium diet should note that potassium-containing additives in processed foods contribute to overall potassium intake.
Where it stands with the regulators
Who should be careful
People with chronic kidney disease on a medically supervised low-potassium diet should account for potassium from additives including E326 in processed and cured meats. Check labels for Potassium lactate or E326 and discuss with a renal dietitian.
The honest read
Potassium lactate is among the most ordinary additives in the food supply. It is the potassium salt of lactic acid, the same compound responsible for the tang in yoghurt and sourdough. EFSA reviewed it in 2013 alongside lactic acid and all its mineral salts and found no basis for setting a numerical limit at the amounts used in food. It does not carry a recognised carcinogen classification, a hormone-disruption signal, or a hyperactivity link. The one honest note is for people already managing kidney disease on a low-potassium diet, for whom every source of dietary potassium, including additive-delivered potassium, counts and should be tracked.
Related additives
Common questions
Is E326 banned in the UK?
No. Potassium lactate is approved for use in the UK and EU as an acidity regulator and preservative, listed on the UK FSA approved-additives register and authorised under assimilated EU Regulation 1333/2008.
Is E326 the same as potassium in my diet?
Yes, it does contribute a small amount of potassium. For most people this is not significant. People with chronic kidney disease on a low-potassium diet should factor it in when eating processed meats that contain E326.
What foods contain E326?
Primarily cooked and cured meats, including sliced ham, bacon, sausages, and pate. Also used in ready-to-eat meals, marinated fish, soups, and some sauces. Look for Potassium lactate or E326 on the ingredient list.
Is E326 vegan?
Yes. Potassium lactate is produced by neutralising lactic acid, which in commercial food-additive manufacture is typically derived from bacterial fermentation of plant-based carbohydrates such as corn starch or sugarcane. The additive itself contains no animal-derived ingredients. However, the foods it is most commonly used in, such as processed meats, are not vegan.
Sources
- UK FSA Approved Additives and E Numbers
- EFSA ANS Panel Scientific Opinion on lactic acid and its ammonium, calcium, magnesium, potassium and sodium salts as food additives (2013)
- Regulation (EC) No 1333/2008 on food additives (consolidated text)
- NHS guidance on diet for chronic kidney disease
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