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Preservatives & Stabilizers

Potassium Sorbate

Also known as: Sorbic acid, potassium salt, E202, K-sorbate

The gentle, effective preservative that keeps food, wine, and cosmetics from molding — among the best safety profiles in its class.

  • By IngredientWiki Editorial Team
  • Fact-checked by IngredientWiki Editorial Team
  • Updated 2026-09-26
  • 2 min read

In short

Potassium sorbate is the potassium salt of sorbic acid, a naturally occurring compound first isolated from mountain-ash berries. It is one of the most widely used preservatives in food, wine, and cosmetics because it is effective against molds and yeasts at low concentrations, nearly tasteless, and remarkably low in toxicity — the World Health Organization's ADI (25 mg/kg body weight/day) is among the highest for any preservative. It works by inhibiting mold and yeast enzymes rather than killing bacteria outright, which is why it is paired with weaker acids in many systems. Genuine allergy is rare; occasional skin irritation in leave-on cosmetics is the most common real-world complaint.

  • Potassium salt of sorbic acid; EU food code E202
  • Controls molds and yeasts at 0.025–0.3%
  • Among the best-established safety profiles of any preservative
  • Pairs with acids like benzoate for broad-spectrum coverage

What is Potassium Sorbate?

Potassium sorbate is the preservative almost everyone has consumed without knowing it — it keeps wine, cheese, dried fruit, and skincare from molding, and it does so with one of the cleanest toxicology files in the industry. Unlike some preservative classes that carry endocrine or sensitization baggage, sorbate's worst offenses are occasional mild skin irritation and rare contact allergy. The 'clean beauty' movement has made it a scapegoat anyway, which is ironic: a product that molds in your cabinet is arguably the less safe option. Understanding sorbate means separating its genuinely benign profile from generic preservative anxiety.

Where it comes from

Natural sources

  • Sorbic acid was first isolated from rowan (mountain ash) berries
  • Produced commercially from ketene and crotonaldehyde; nature-identical

How it's made

White crystalline powder or granules; used at 0.025–0.3% in foods and up to 0.3% in cosmetics.

What it does in products

  • Mold and yeast inhibition via enzyme deactivation
  • Shelf-life extension in high-moisture foods
  • Cosmetic preservation against fungal spoilage
  • Wine stabilization (prevents refermentation in sweet wines)

Benefits

Effective broad fungal protection

strong evidence

Prevents mold and yeast growth at low concentrations, protecting food and cosmetics from spoilage and mycotoxin-producing fungi.

Excellent safety margin

strong evidence

Extensively reviewed by JECFA, EFSA, and the FDA with an ADI of 25 mg/kg/day — among the highest of any preservative — and no carcinogenic or endocrine findings.

Neutral sensory profile

strong evidence

Virtually tasteless at use levels, making it suitable for delicate products like wine and flavored beverages.

Side effects & safety

Mild skin irritation (uncommon)Mostly in leave-on products; patch-test if sensitive.
Contact allergy (rare)Patch-test clinic rates are low (typically under 0.5%).
Digestive upset at very high intake (rare)Only relevant far above food use levels.

Safety considerations

  • Considered safe in pregnancy at normal dietary exposure.
  • None significant.
  • Not for: Known sorbate allergy (rare)

How it's used

In supplements

Not supplemented; intake is via preserved foods.

In skincare

0.05–0.3%, often combined with a lower pH or co-preservatives.

Regulatory status

  • GRAS as a direct food additive; permitted in cosmetics. No FDA disease claims apply.
  • GRAS (generally recognized as safe) for food use.
  • INCI name on cosmetic labels: Potassium Sorbate.
  • Reviewed by CIR and found safe as used in cosmetics.

Popular products containing Potassium Sorbate

  • Many natural-brands face creams (e.g., Mad Hippie) — 'Clean' formulas preserved with sorbateMad Hippie · Skincare
  • Wine and cider production — Industry-standard wine stabilizerVarious · Food
  • NOW Potassium Sorbate — Home food-preservation powderNOW Foods · Food

Product names and brands are shown for reference and belong to their respective owners.

How sorbate works

Sorbic acid crosses the mold or yeast cell membrane and inhibits key enzymes involved in carbohydrate metabolism and spore germination. Crucially, its activity rises as pH drops — most effective below pH 6.5, which is why it pairs naturally with acidic formulations and beverages.

The clean-label controversy

Anti-preservative marketing lumps sorbate with parabens and formaldehyde releasers, but the toxicology separates them sharply. Sorbate has no endocrine activity, no carcinogenicity signals, and a very high ADI. The main legitimate concern is contact allergy, which is rare and dose-related. For most consumers, sorbate is a net safety benefit.

Frequently asked questions

Is potassium sorbate natural?

Sorbic acid occurs in nature, but commercial sorbate is synthesized — though it is chemically identical. 'Nature-identical' is the accurate label.

Why is it in wine?

To stop residual yeast from refermenting sweet wines in the bottle. Without it, many off-dry wines would continue fermenting after bottling.

Can sorbate cause skin reactions?

Occasionally — mild irritation in leave-on products is the most common issue, and true allergy is rare. If a product stings persistently, switch formulations.

The bottom line

Potassium sorbate is one of the safest, most effective preservatives available — the rare ingredient whose anxiety-driven avoidance creates more risk than its use.

References

  1. Sorbic acid and its salts — safety evaluation. EFSA Journal. https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2015.4144
  2. Potassium sorbate — cosmetic ingredient review. CIR. https://www.cir-safety.org/ingredients
  3. Preservatives in cosmetics: an overview. PubMed Central. https://pubmed.ncbi.nlm.nih.gov/34422023/