This professional strength serum contains effective levels of Salicylic Acid (2%) and our exclusive Acnostat complex to go to work on the causes and effects of acne, from bacteria to clogged pores to inflammation. While breakouts stop, anti-aging starts. Maximum strength MMPi-20 rejuvenates skin’s surface at the structural level, measurably reducing lines and imperfections including the marks caused by acne.  Niacyl boosts skins own strengthening barrier.  The results are clinically proven.