It is unbelievable how a Retinol Product (similar to Retin-A), that is not prescribed, can create such a deep healing in the skin without excessive burning. We were shocked during the testing period to see the repair results and the extreme exfoliation created by applying SSS Rejuva Serum after Stimuderm and PerfecTone. Two of our test cases had used Retin-A before and said the exfoliation and firming was the same. This is used if not using a prescribed Retin-A. Some of the Ingredient list contains Hyaluronic, Alpha Lipoic & Glycolic Acid as well as Retinyl Palmitate, Zinc & copper Sulfate.