It's not just one line. It's the combination of products that you use and the treatments you provide. The two most important are BP and Vit. A. Check out Face Reality products by Laura Cooksey. Also, buy the book Acne RX by Dr. James Fulton.
I second Brenda's comments. I tried for quite a while to treat acne with just "effective products", and never got long-term results. I also use Face Reality's program virtually as recommended (I've made a minor adjustment here and there due to the very dry climate where I am), and not only their home-care and professional treatments, but also the extensive life-style, environmental, and dietary changes that have to be part of acne treatment for it to be successful.