Optiphen Plus is a paraben- and formaldehyde-free preservative system that is ideal for products with a lower pH systems. Optiphen Plus is an ISP patent-pending liquid preservative formulation featuring an innovative blend of phenoxyethanol, sorbic acid and an emollient base that is ideal for slightly acidic personal care products requiring broad spectrum protection. Optiphen Plus performs best in formulations below 6.0 pH. Depending on the formulation, Optiphen Plus has also been proven effective at pH levels above 6.0. This preservative is effective as a stand-alone system and functions well with other preservatives. Optiphen Plus has an extensive range of applications in aqueous and emulsion-type personal care formulations and is compatible with most raw materials in the personal care industry. INCI: Phenoxyethanol (and) Caprylyl Glycol (and) Sorbic Acid.