Potassium sorbate is a preservative used in skincare and cosmetics to extend shelf life and maintain product stability. It has antibacterial and antifungal properties, preventing the growth of harmful microorganisms, bacteria, fungi, and mold. Potassium sorbate is generally considered safe for use in skincare products, with a low risk of irritation.
Potassium sorbate has several benefits in skincare and cosmetics: Antimicrobial and antifungal properties: It helps prevent the growth of harmful microorganisms, bacteria, fungi, and mold, which can cause skin infections and blemishes. Preservative: It helps extend the shelf life of skincare products by preventing spoilage and maintaining ingredient stability. Safe for sensitive skin: Potassium sorbate is generally considered mild and non-irritating, making it suitable for sensitive skin types.
Potassium sorbate is suitable for all skin types, including sensitive skin.
Potassium sorbate is generally considered safe for use in skincare products. However, some individuals may experience allergic reactions, such as skin irritation or redness.
Potassium sorbate should be used in skincare products at a concentration of up to 1%. Higher concentrations may increase the risk of irritation.
Potassium sorbate is naturally derived from the berries of the rowan tree (Sorbus aucuparia). However, it is commonly produced synthetically by neutralizing sorbic acid with hydrogen peroxide.
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed potassium sorbate safe for use in cosmetics and personal care products.
The Environmental Working Group (EWG) has given potassium sorbate a safety rating of 3 on a scale of 1 to 10, with 1 being the lowest health risk and 10 being the highest.
Potassium sorbate is also used as a preservative in food and beverages, such as dehydrated meats, dairy products, pastries, and wine. Potassium sorbate is restricted in EWG VERIFIED products and cannot be used without adequate substantiation. Potassium sorbate is a distilled salt, which makes it slightly milder than benzyl alcohol. Some people may experience dryness or allergic reactions with benzyl alcohol, but these effects are relatively rare. Potassium sorbate is approved for safe use as a preservative in moist cat and dog foods and in other animal feed. Potassium sorbate is also used in eyeshadow and other cosmetics, shampoos and moisturizers, and contact lens solution. Sorbic Acid and Potassium Sorbate are effective for the control of mold and yeast in cheese products, baked goods, fruit juices, fresh fruits and vegetables, wines, soft drinks, pickles, sauerkraut, and certain fish and meat products. Sorbic Acid and Potassium Sorbate have a broad spectrum of fungistatic activity but are less active against bacteria. Potassium Sorbate at 0.1% in the diet or 0.3% in drinking water for up to 100 weeks was not carcinogenic. Sorbic Acid is a straight-chain monocarboxylic acid also known as 2,4-hexadienoic acid. Potassium Sorbate is the potassium salt of Sorbic Acid. In cosmetics and personal care products, Sorbic Acid and Potassium Sorbate function as preservatives and antimicrobial agents. The use of preservatives is required to prevent product damage caused by microorganisms and to protect the product from inadvertent contamination by the consumer during use. Potassium sorbate is the inactive salt of sorbic acid. It readily dissolves in water where it converts to sorbic acid, its active form, at a low pH. Sorbic acid is very pH dependent. While it shows some activity up to pH 6 (about 6%), it is most active at pH 4.4 (70%). At pH 5.0 it is 37% active. As sorbic acid, it is considered to be active against mold, fair against yeast and poor against most bacteria. Sorbic acid is an unsaturated fatty acid and as such is subject to oxidation (use of an antioxidant like Mixed Tocopherols T50 is recommended). It is also sensitive to UV light and may turn yellow in solution. Gluconolactone is reported to stabilize potassium sorbate against discoloration and darkening in aqueous solutions and may be useful in stabilizing sorbic acid in the water phase of a product. While sorbic acid is naturally occurring in some fruits (like the berries of the mountain ash), virtually all of the world's production of sorbic acid, from which potassium sorbate is derived, is manufactured synthetically, and is a nature-identical compound chemically equivalent to the molecule found in nature. Sorbic acid can cause contact dermatitis at concentrations above or below 0.5%. Studies show that if it is used at a concentration of no more than 0.2% it is unlikely to constitute a safety hazard. Potassium sorbate is not a broad spectrum preservative for cosmetic use and should be combined with other preservatives. If potassium sorbate is used as a preservative, the pH of the finished product may need to be reduced for potassium sorbate to be effective. This is because potassium sorbate is the inactive salt form of sorbic acid. To be useful, the pH of the formulation must be low enough to release the free acid for useful activity. Following is a chart to of the relative activity at various pH: pH % Active Sorbic Acid 3 98 4 85 5 37 6 5.5 7 0 All cosmetic products should undergo microbial testing to ensure the efficacy of any preservative system.
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