KLAPP PSC Active Sebum Reducer Tonic is an active ingredient preparation that, when used regularly, significantly reduces sebaceous gland activity and supports healing of inflamed skin areas.PSC - Skin care for impure, oily skinP.urus = PureS.anus = HealthyC.utis = SkinThe PSC series leads to the normalization of oily problem skin. The overall appearance of the skin is improved, the complexion is clarified and matted. The sebaceous secretion of the skin is regulated to normal production in case of both over- and under-activity. To avoid congestion of sebum and horny cells in the pores, consistent home care with the PSC preparations is absolutely necessary.