This water-free solution contains a 5% concentration of an advanced retinoid active complex called Granactive Retinoid that has been shown to offer better results against multiple signs of ageing than retinol without any of the irritation and drawbacks common with retinol. Granactive Retinoid, an active technology from Grant Industries, is a solubilized system of Hydroxypinacolone Retinoate, a highly-advanced form of retinoid which is, in fact, a non-prescription ester of all-trans direct retinoic acid that offers a multi-fold better effect against signs of ageing than retinol, retinyl palmitate and nearly all other forms of non-prescription retinoid. Refrigerate after opening