I have very bad clog pores, especially on my nose and chin. I can literally feel the plugs on my skin if I don't extract once a week. After indepth research, I came to understand that I will need salicylic acid to exfoliate the surface and clean deep into the pores to prevent the return of the black/whiteheads. However, a tricky issue is that the product has to be of the right p.H. and if it is off by just 1, the product will cease to perform at its best. Uriage Hysec K18 contains both AHA and BHA. What's even more eyebrow-raising is it contains EIGHTEEN [18] % of AHA. OK BYE BLACKHEADS. I am honestly not sure about p.H for this product but I immediately bought it before you can blink. After using it for two weeks, I am majorly impressed. As it contains the thermal water, it keeps my skin smooth and moisturized. With Licorice extracts, it also keeps my skin matte. LOVE IT. This is my holy grail. Ok, now be prepared to be shocked.