This advanced night serum from Kiehl's is formulated with 0.3% Retinol to deliver powerful, fast-acting wrinkle reduction benefits while you sleep. Designed for effective overnight use, this serum targets the visible signs of aging, helping to smooth the appearance of fine lines and deep wrinkles. Its specialized delivery system ensures optimal efficacy where it's needed most, supporting skin renewal and a more youthful complexion over time.