What It Is: A potent retinol serum in a daily-strength micro-dose that visibly reduces wrinkles, firms skin, evens skin tone, and smoothes texture with minimal discomfort. Paraben-free and fragrance-free. What It Does: Kiehl's potent retinol serum is formulated with 0.1% Pure Retinol in a daily-strength micro-dose, along with Ceramides and Peptide, to promote gentle skin surface turnover for youthful-looking skin. The precise micro-dose formulation of Kiehl's anti-aging serum delivers visible results with minimal visible redness, dryness, or peeling. Wrinkles are visibly reduced, skin is firmer, pores appear minimized, and skin tone and texture are more even. Kiehl's retinol serum is a fast-absorbing lightweight cream. Paraben-free, fragrance-free, mineral-oil, phthalate-free. Easily integrates into a skincare routine and is suitable for use day or night For all skin types, including first-time Retinol users and sensitive skin types Made with recyclable packaging Key Ingredients: Pure Retinol: Within Kiehl's anti-aging serum, Pure Retinol in a gentle, daily strength micro-dose steadily accelerates skin surface turnover to bring new, fresh skin to the surface. This helps address visible signs of aging for skin that's visibly renewed and youthful-looking. Ceramides: Ceramides are lipids naturally occurring in both skin and hair. Within the formula, Ceramides helps strengthen the moisture barrier to enhance skin's tolerance of Pure Retinol. Peptide: Kiehl's formula with Peptide works to enhance skin integrity, helping it receive optimal, visible youth-renewing results. How to Use: After cleansing, apply our serum with retinol over the entire face, including the under eye and crow's feet area, carefully avoiding contact with the eye, eye lid area, and lips This anti-aging serum can be used morning or night If applied during the day, our serum with retinol should always be used with SPF