Works nightly to help reverse the look of post-acne marks & uneven tone. Works nightly to support skin's natural exfoliation process helping erase the look of post-acne marks. Improved clarity and even tone in just one week. Our recommended regimen for stubborn acne and post-acne marks: Stubborn Acne AM Treatment; Stubborn Marks PM Treatment. When used together, the Retinol helps release pore-clogging dead skin cells, giving Benzoyl Peroxide a clear path to effectively target acne-causing bacteria. Retinol SA: A stabilized, highly refined form of Vitamin A, providing visible complexion correction. Clinically Proven: Non-comedogenic. Formulated without Parabens, oil, phthalates, dyes and fragrances.