Look for a Retinol-containing serum to use every day after cleansing. Our diverse mall features a plethora of efficient and delicate anti-aging products that are always in the same proximity. Kiehl’s Fast Release Wrinkle-Reducing 0.3% Retinol Night Serum. This fast-acting 0.3% Retinol night serum accelerates skin surface cell renewal with Retinol that penetrates up to 15 surface layers deep into the skin. Experience visible reduction of fine lines in just 5 days, and visible improvement in deep wrinkles in 2 weeks.