Optiphen Plus 1 Fl. Oz (30 mL) 1 ounce. Optiphen plus for lotions and facial products, Hair care and skin care lines. I have used this product in my creams that contain water. It has a slight scent, but is easily covered by any added fragrance. A no paraben preservative. Paraben free products are important to my customers, so I love this product. An all-natural preservative. No Formaldehyde. Ingredient: Phenoxyethanol, Caprylyl Glycol, Sorbic Acid Some customers have complained that it did thin their products, but this was the only complaint so keep this in mind.