I've had problem skin (mild to moderate acne) since I was about 13 or 14 years old. I started using Proactiv about 2 years ago and oh how I wish I'd tried it earlier. I've tried EVERY acne product available in drugstores and NOTHING compares. It is absolutely the only system that has ever made a real difference in my skin. So much so that when I see people with mild to moderate acne I want to pull them aside and tell them to try it. It took about 4 to 6 weeks for me to notice a definite improvement, but boy was I glad I stuck it out. The Refining Mask is also a fabulous product that's worth its weight in gold. This is one beauty product I actually BELIEVE the celebrities that endorse it really use.