Stem celluar anti-wrinkle overnight retinol serum is a clean, vegan serum formulated with a potent 2.5 Percent bio-retinol and retinol formula that combines skin-rescuing technologies to help thwart the visible signs of aging and fatigue while you sleep. Skin-rescuing technologies to help keep your skin looking and acting youthful while you sleep. This clean retinol serum glides on smoothly and leaves skin feeling hydrated. Made with certified organic ingredients to protect humans, animals, and the planet.