No doubt you've seen the star-studded ads for Proactiv. Justin Bieber is not the only young celebrity pushing the product. Avril Lavigne, Julianne Hough, and Katy Perry all are singing its praises.

— Products are chosen independently by our editors. Purchases made through our links may earn us a commission. If you’ve been dealing with acne breakouts for years, you know it’s more than just a skin ...