Potassium Sorbate
The short version
The potassium salt of sorbic acid, used as a water-soluble antifungal preservative.
It's widely considered safe at the amounts used in food, so we mark it green. The Safety section below has the details.
Where it comes from
Synthesized by neutralizing sorbic acid with potassium hydroxide. Industrial production began in the mid-20th century as a more soluble alternative to sorbic acid.
How it's used
Common in wine, cheese, yogurt, dried meats, and baked goods. Frequently used in personal care products as a paraben alternative. Typical use levels range from 0.025% to 0.3%.
Safety profile
Generally regarded as safe (GRAS) by the FDA. ADI of 25 mg/kg body weight. Rapidly metabolized as a fatty acid. Some studies note mild skin sensitization in concentrated cosmetic applications.
Physical & chemical properties
White granular powder, highly soluble in water (58 g/100 mL at 20°C). Optimal antimicrobial activity at pH below 6.0. Works synergistically with low pH and reduced water activity.
Regulation worldwide
Approved globally for food and cosmetic use. EU Regulation 1333/2008 includes it in the general list of permitted additives.
Educational information only. Not medical or dietary advice.