It is well known and understood in the bosom of the world’s beauty forum that the ONLY proven skincare ingredient on the market today is Retinol. This ingredient is fundamentally what everything else aspires to become. The down side as we all know is that many skin types cannot tolerate this stand alone ingredient. Which is why RSL has massively upgraded our retinol into a form that is much gentler, adds moisture to the skin, and has ALL of the benefits of standard Retinol minus the slight smell and color. Its a beautiful thing.....and that's our thing.