For oily skin Oily or impure skin is caused by excessive production of sebum (sebum). As a result, more free fatty acids are produced on the skin surface, which lead to both skin irritation and a change in the physiological pH value. Products that reduce excess sebum production are particularly suitable for oily and impure skin. In addition, care products should balance the oil-moisture content of the skin. If the products dry out the skin too much, the opposite effect can occur in that sebum production is stimulated again. The macroalgae extract contained in Dr. M. Sebum Reduction has been shown to reduce sebum production in the skin.