“Potassium Sorbate is a mild preservative being used in cosmetic and skincare formulas as a paraben alternative to prevent or retard the growth of microorganisms and protect products from spoiling, according to CosmeticsInfo.org. Developed from Sorbic Acid, which is naturally found in the berries of the mountain ash tree, Potassium Sorbate is effective against fungi, mold and yeast, and to a lesser degree bacteria. Potassium Sorbate is also used as a food preservative and is frequently seen as a wine ingredient to increase shelf life and stability (Wikipedia). It is FDA approved and not considered toxic. It is also CIR approved.