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.Who it's for: Ideal for all skin types.What it does: This facial serum is precisely formulated to deliver a daily-strength microdose of pure retinol for visible anti-aging results with minimal discomfort such as redness, dryness and peeling. It helps promote skin tolerance of pure retinol with peptide and ceramide.Key ingredients:- Pure retinol: helps steadily accelerate skin surface turnover to bring new, fresh skin to the surface to help address visible signs of aging for skin that's visibly renewed and youthful looking- Ceramides: the lipids naturally occurring in both skin and hair. Within Kiehl's formula, ceramides help 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 resultsResearch results:Based on expert grading in a clinical study with 54 panelists after 12 weeks:- 100% showed reduced fine lines and wrinkles- 90% showed improved firmnessHow to use: After cleansing, apply Kiehl's facial serum with retinol over the entire face, including the under-eye and crow's-feet areas, carefully avoiding contact with the eyes, eyelid area and lips. If applied during the day, Kiehl's serum with retinol should always be used with SPF and can be easily integrated into a skin-care routine. The serum is suitable for day and night use. 1 oz. Paraben-free; phthalate-free; fragrance-free; mineral oil-free Made in the USA