Potassium Sorbate (E202): A Common Preservative and the Skin
Potassium sorbate keeps countless foods and cosmetics fresh, and is an occasional cause of contact reactions and hives. What it is, who reacts, and where it hides.
What it is
Potassium sorbate is one of the most widely used food preservatives in the world. It is the potassium salt of sorbic acid and works by stopping mould, yeast and some bacteria from growing, which extends shelf life in a huge range of products. The sorbate family runs E200 (sorbic acid), E201 (sodium sorbate), E202 (potassium sorbate) and E203 (calcium sorbate), with potassium sorbate being by far the most common. It is generally regarded as one of the gentler preservatives, but no preservative is completely free of skin reactions.
Who reacts, and how it shows on the skin
For most people potassium sorbate causes no trouble at all. In a minority, it shows up in two different ways. The first is contact reactions from cosmetics and creams, where sorbic acid and its salts are a recognised, if uncommon, cause of stinging, redness and mild irritation, especially on already-sensitive or broken skin. The second is in food, where some people with chronic hives (urticaria) report flares linked to preservative-heavy products, and sorbates sometimes feature alongside benzoates and sulphites in that picture. These reactions tend to be non-allergic and dose-related, so a small amount may be fine while a lot is not, and standard allergy tests often look normal.
Where it hides
In food: cheese and dairy spreads, baked goods, cake fillings and icings, dried fruit, soft drinks, wine and cider, dips, sauces and many chilled ready foods. In cosmetics and medicines: creams, lotions, eye products and some liquid medicines, where it preserves water-based formulas. Look for potassium sorbate, sorbic acid, or E200 to E203 on the label.
What to do if you think you react
Keep a food-and-skin diary and note preservative-heavy products, looking for a repeating pattern before you cut anything out. Fresh, minimally processed foods naturally carry fewer added preservatives, which makes a useful comparison. If a cream stings, patch-test a new one on your inner forearm for a few days before using it more widely. If your hives are frequent or persistent, see a GP, because chronic urticaria deserves proper assessment rather than guesswork.
Common questions
Is potassium sorbate the same as sulphites? No. Sulphites are a separate preservative group (E220 to E228) with their own pattern of reactions. Sorbates and sulphites can both appear in wine, which is one reason wine is a frequent trigger to untangle.
Is “natural” sorbate gentler? Sorbic acid was first found in rowan berries, but the version in your food is almost always made synthetically, and origin makes no difference to whether your skin reacts.
Could the reaction be something else in the product? Often, yes. Preservative-heavy foods and cosmetics contain many ingredients, so a diary and careful swaps matter more than blaming the first name you recognise.
Check it against your own list
A free scanner like Yuka gives a packaged product a general health score, a useful broad read, though that verdict is the same for everyone rather than tuned to your skin. Open Food Facts is a free, community-run database where you can look up a product’s additives and labels. To check a product against the specific things that make your skin react, a personal-list app like ClearaScan lets you save your triggers once and scan any product, food, medication or cosmetic, against your ingredient guard list, flagging only yours. Its Reaction Journal lets you tie a flare back to the product that caused it, a shared Care Circle lets family scan for you, and a Trusted Products list keeps what you have cleared. It is currently in early access. (Disclosure: our editor co-founded ClearaScan, and we are not paid to mention the others.)