(1) Corneometry test on 10 volunteers aged 29 to 65, with dry or moderately hydrated skin, for 8 hours.
(2) Sebumetry test on 23 volunteers aged 32 to 40, with combination skin and blemishes, for 28 days.
(3) Evaluation of the pH regulating action on 9 volonteers aged 23 to 38, with oily skin on the forehead, for 60 minutes.