If you go for aggressive retinoids, like RetinA,  you will need to make up for a disrupted skin barrier, with occlusive ingredients like petrolatum or mineral oil. For all other retinoids that do not visibly disrupt the skin barrier, think about what the cell needs to follow the instructions given by the retinoid. Nutrition like that provided by SAS collagen serum and Every Lipid Serum will help you get the best results out of retinoids. What does a retinoid do?  Go and divide! After retinoic acid enters the cell, it binds to specific nuclear receptors. These “activated” nuclear receptors, in turn, bind to specific regulatory sequences (called retinoic acid response … Continue reading Which actives complement retinoids?