Wake up to smooth, bright skin! For those looking to add a retinol serum to their regimen, Olay Regenerist Retinol24 Night Serum formula is optimized to keep retinol stable from first use to last, providing smooth, glowing skin overnight with virtually no irritation. Olay Retinol24 penetrates deep into the skin’s surface layers while simultaneously providing 24 hours of hydration. Expect to see visible improvements in fine lines & wrinkles, smoothness, brightness, firming, dark spots, & pores.