Potassium sorbate is predominantly used as a food preservative. It inhibits the growth of molds and yeasts in many foods, such as cheese, wine, yogurt, dried meats, soft drinks, and baked goods.
These same preservative properties can be used to extend the shelf-life of cosmetics and personal care products. While potassium sorbate is effective against fungi, mold, and yeast, it is less active against bacteria. Therefore, potassium sorbate is not considered a broad-spectrum preservative and it must be used in conjunction with other preservatives to ensure formulas are protected.
Preservatives have received a negative connotation in the cosmetic and skincare industry because of claims that preservatives are hazardous to health. This is why many organic and natural beauty brands often include ‘preservative free’ claims on product labels. However, the use of preservatives is necessary for most products to prevent degradation caused by microorganisms, and to protect the product from inadvertent contamination during use.
A preservative may also be added to a product to protect it against deterioration caused by exposure to oxygen. In this case, these ingredients are also called antioxidants. Just like food, cosmetics products can become contaminated without preservatives, leading to product spoilage and possibly irritation or infections. Microbial contamination of products, especially those used around the eyes and on the skin, can lead to significant complications. Preservatives help prevent such problems.
