What science there is relates to wound healing. When wounds occur, the body’s response it to mobilize a very aggressive healing process with the production of cytokines (a type of protein) that invokes the immune system and migration of healing cells. This may cause enough stimulation to invoke a hair response to the healing process as well. When this is done with the drug Minoxidil on board, it brings the effects of the minoxidil more to stimulate local absorption. We seem to read article suggesting that minoxidil with dermarollers, seem to work. That is my best guess.