i took it back when i was 17 and it didn't work worth a shit so i went to the dermatologist and they gave my a perscription for differin cream and benzaclin gel to switch in an out (use one for a few weeks then switch) and take this antibiotic called dynacin. that worked until i just got tired of doing it...now i just kinda grew out of my acne, i get it occasionally, the best thing to do is drink a lot of water. i just wash my face w/ clean and clear foaming facial cleanser in the morning and it keeps it away