Dr. Barbara Sturm does not recommend that you use retinoids as a matter of skin health. Retinoids reduce the natural protective barriers of your skin by killing healthy skin cells and stripping the surface layers away. The new cells underneath are not mature enough to fulfil their tasks of protecting the skin against environmental stressors such as UV rays, pollution, pathogens or other irritants which in turn can lead to an inflammation cascade and ensuing post-inflammatory hyperpigmentation issues and skin breakouts. At Dr. Barbara Sturm we believe in rejuvenating and healing the skin by helping it fight inflammation and supporting it with strong antioxidants and anti-bacterial ingredients. Thus, we do not recommend combining our products with Retinol.