If you thought retinol was only good for reducing wrinkles, think again. While the vitamin-A-derived ingredient boosts cell turnover, in doing so, it also has the ability to unclog pores, which allows other ingredients you're using to better penetrate the skin. People with oily skin will also notice a decrease in oil production, Dr. Murad said. Don't expect this to work right away, though — retinol needs four to six weeks to work.
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