What It Is: A potent retinol serum formulated with pure retinol in a daily-strength microdose along with ceramides and peptides.

What It Does: It promotes gentle skin surface turnover for youthful-looking skin. The precise microdose 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's tone and texture are more even. This serum is lightweight and fast-absorbing.

How To Use: After cleansing, apply serum with retinol over the entire face, including the under eye and crows feet area, carefully avoiding contact with the eye, eye lid area, and lips. It can be used morning or night .