THE PRODUCT: La Roche-Posay Effaclar AI Intensive Acne Spot Treatment, $29
THE CLAIM: Reduces acne by 31 percent in three days and blackheads by 55 percent in 10 days.
DOCTOR'S DECODING: "I like this combination of benzoyl peroxide and an exfoliant to treat acne. But if you don't have a bad breakout, a pimple could go down on its own in 10 days, even if you don't use any treatment."
TESTER'S FEEDBACK: "Within three days, the two enormous zits on my chin were barely visible. But after using this product for two weeks, my skin got red and irritated, and I still had new breakouts."