It is very important that anything you put on the skin after micro-needling has been specifically tested and proven to be safe to use after this procedure. Micro-needling creates thousands of micro-channels in the skin which enhance penetration of topical serums and medications, dramatically increasing their effectiveness. Up to 80% of product can penetrate the skin compared to 7 to 10% with normal topical application.Also, I do not like derma rolling, as rollers create a more erratic pattern of "tears" through the skin rather than the clean, more evenly distributed punctures seen with the motorized micro-needling machines. In my office, we use the ProCell Therapies system which combines motorized micro-needling with concentrated human growth factor serums made from human stem cells. This serum is made specifically for this treatment. Our patients also use a growth factor serum at home after the office treatment.