Which is better, dermapen, dermaroller, dermastamp?

I believe that men who use the Dr. Pen device with 36 needles and a depth of 1.25mm have the best chance to reverse their hair loss.  The idea is to control the damage to the area where the stem cells reside that may trigger hair growth. I advise my patients to hold this reciprocating pen in a single spot for 10 seconds, then move it to the next spot where they want the hair to grow.  Let’s say that you have an area of 2 by 3 inches; that means that the pen is held in many positions until the entire targeted area has been covered by the pen.  This injury starts off a healing cascade with some bleeding, platelet aggregation, and the appearance of special defense cells called macrophages. Special proteins that stimulate new blood vessel formation pour into the wound and are followed by stem cell activation, which often triggers hair follicle growth. When this process is repeated weekly with a Dr. Pen device, I believe you get the best control of the healing cascade.