Sodium lactate
The sodium salt of lactic acid, used to extend shelf life, control acidity, and keep moisture in meat, bakery and dairy products.
What is it?
Sodium lactate is the sodium salt of lactic acid (E270), the naturally occurring acid produced when sugars ferment. Commercially it is made by neutralising fermentation-derived lactic acid with sodium hydroxide and is available as a liquid syrup or crystalline powder.
What does it do?
It works in two ways. As an acidity regulator it buffers pH, keeping a product within a stable acid range that slows microbial growth. As a humectant it attracts and holds water molecules in the food matrix, reducing water activity below the level at which most spoilage organisms and pathogens can multiply. The combination extends shelf life and helps maintain texture.
Where you will see it
Most commonly found in processed and cured meats such as cooked ham, frankfurters, pate and ready-to-eat poultry products, where it is used alongside nitrites to inhibit Listeria and other pathogens. Also used in some bakery products to retain moisture, in flavoured dairy desserts, and in some sauces and dressings. On a label it appears as 'sodium lactate' or 'E325'.
What the science says
Antimicrobial action in processed meat
Sodium lactate lowers water activity in meat products, which restricts the growth of Listeria monocytogenes and other spoilage bacteria. Studies in ready-to-eat meat have shown it extends the lag phase before bacterial growth begins. The effect is amplified when it is combined with sodium diacetate.
Sodium lactate at 2 to 3% concentration significantly inhibited Listeria monocytogenes in cooked, ready-to-eat meat products stored at refrigeration temperatures.
The combination of sodium lactate and sodium diacetate was found more effective than either alone in controlling Listeria in ready-to-eat deli meats, forming the basis of USDA FSIS guidance on Listeria control.
Sodium content and dietary context
Sodium lactate contributes sodium to the diet, which is relevant for people managing salt intake. However, the amounts used as an additive are generally small relative to the sodium contributed by salt (sodium chloride) already present in the same processed foods. The practical sodium load from E325 specifically is a small fraction of total dietary sodium in the products where it appears.
The UK Scientific Advisory Committee on Nutrition recommends adults consume no more than 2.4g of sodium (6g salt) per day; processed and cured meats are among the highest contributors to dietary sodium in UK diets.
EFSA safety review
EFSA's Panel on Food Additives and Nutrient Sources evaluated lactic acid and its salts (including sodium lactate) as part of its re-evaluation programme. The panel found no evidence of genotoxicity or other toxicological concerns at levels used in food. No numerical ADI was considered necessary because lactic acid and its salts are endogenous metabolites at typical exposure levels from food.
EFSA's FAF Panel concluded that lactic acid (E270) and its ammonium, calcium, potassium and sodium salts (E327-E325) raise no safety concern at current permitted levels; no ADI was needed.
Where it stands with the regulators
Who should be careful
People on a medically supervised low-sodium diet should be aware that processed meats containing E325 contribute additional sodium beyond the salt already present. Check the nutrition label's total salt figure. Those avoiding pork or certain meats for dietary or religious reasons should check the product itself, not just the additive. Look for 'sodium lactate' or 'E325' in the ingredients list.
The honest read
Sodium lactate is among the more straightforward additives on the market. It is chemically identical to the sodium salt your body produces as a by-product of muscle metabolism and is a normal part of the diet through fermented foods. The science has not produced credible concern signals at food-use levels. The practical question for most people is the total sodium in the processed meat or product itself, not the additive in isolation. EFSA completed a formal re-evaluation and found nothing requiring restriction.
Related additives
Common questions
Is E325 banned in the UK?
No. Sodium lactate is an approved food additive in the UK under the assimilated EU Regulation 1333/2008, retained in UK law after Brexit. It appears on the UK FSA's approved-additives list.
Is E325 the same as salt?
No. Sodium lactate is the sodium salt of lactic acid, not sodium chloride (table salt). It does contribute sodium to the diet, but it tastes different from salt and is used for preservation and moisture retention rather than flavouring.
What foods contain E325?
Most commonly processed and cured meats: cooked ham, frankfurters, pate, sliced deli meats and ready-to-eat poultry products. It also appears in some bakery goods, dairy desserts and sauces.
Is E325 vegan?
The additive itself is typically produced by fermenting plant-based sugars and is vegan. However, it is most commonly found in meat products, so the product containing it will usually not be vegan.
Sources
- UK FSA Approved Additives and E Numbers
- EU Regulation (EC) No 1333/2008 on food additives (consolidated)
- EFSA FAF Panel re-evaluation of lactic acid (E 270) and its ammonium, calcium, potassium and sodium salts as food additives (2018)
- USDA FSIS Compliance Guidelines to Control Listeria monocytogenes in Post-lethality Exposed Ready-to-Eat Meat and Poultry Products
- SACN Salt and Health report
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