The Day & Night Serum Duo pairs two fan-favorite serums to deliver ultimate Glass Skin goals while preventing and reversing visible signs of aging. Featuring our No. 1 Bestselling Glass Skin Refining Serum + our breakthrough Retinal For All Renewing Serum, this iconic serum duo is the key to 24/7 radiance. Discover skin that looks luminous, smooth, clear, firm, even-toned and more youthful. <br><br> <b>Glass Skin Refining Serum:</b> Featuring a revolutionary cocktail of Peach Extract, Niacinamide, East Asian Mountain Yam, Madecassoside, Peptides, and Hyaluronic Acid, this multi-tasking serum delivers ultimate Glass Skin goals—skin so healthy and hydrated, it looks luminous, smooth, and clear, like glass. <br><br> <b>Retinal For All Renewing Serum:</b> A first-of-its-kinds retinoid treatment, featuring patent-pending R-IQTM technology, this breakthrough formula reverses and prevents signs of aging—powerfully and gently. Powered by a potent dose of 0.1% retinal, the most powerful non-prescription retinoid available, this multi-effect retinal serum improves the look of deep wrinkles and shallow lines, visibly restores firmness and elasticity, refines skin texture and the look of enlarged pores, promotes brighter, more even-toned skin, visibly calms redness, and supports the skin barrier. <br><br> Coupled together, this dynamic duo seamlessly takes you from daytime radiance to nighttime renewal.