Murad Retinol Youth Renewal Serum Application: At night, apply a thin layer to clean face and follow with a moisturiser. Reduce frequency if sensitivity occurs Harnessing Retinol Tri-Active Technology, Murad’s Retinol Youth Renewal Serum combines a fast-acting Retinoid, a time-released Retinol and a Retinol booster to maximise potency. As a result, even deep wrinkles are quickly and visibly reduced to leave the skin looking dramatically younger. Helping to firm and even out skin tone, hyaluronic acid spheres attract moisture to plump up the skin’s surface