Principal Secret Skin Care Makes a Great Gift This Holiday Season | Our proprietary Hydrospheres time release moisture delivery system infuses skin with vitamins and antioxidants, leaving skin super-hydrated all day and all night. | The Principal Secret Advanced line is powerful enough to help sustain healthy-looking skin for the extremely sensitive or stressed yet gentle enough not to irritate already inflamed skin. | All formulas are non-toxic, dermatologist tested, designed for all skin types and NOT tested on animals.