SkinCeuticals Glycolic 10 Renew Overnight is an overnight treatment that exfoliates to promote skin clarity and brightness, Glycolic 10 Renew Overnight is formulated with a free acid value of 10% glycolic acid to break the bonds that hold dead cells on the skin's surface and promote cellular turnover. Featuring phytic acid and a triple-action soothing complex that fortifies the skin barrier, it improves the appearance of skin texture and tone, enhances radiance, and reveals more youthful-looking skin. Proven tolerable for nightly use.