Highly Concentrated 0.5% Pure Retinol No Purified Water Or Retinol Derivatives. Formulated Using 0.5% Stabilized, Pure Retinol For Powerful Anti-Aging Care. Best For Skin Accustomed To Retinol But Still Experiencing Progressive Signs Of Aging Such As Loss Of Elasticity And Dryness. For Intermediate-Level Retinol Users Looking For A Highly Concentrated, Youth Booster.