When Microneedling produces hair, how long will it last?

Generally, the dermaroller (the microneedling device) induces Anagen, a single hair cycle and it should be sustained for the duration of the growth cycle. After the hair goes into telogen (about 2-3 years for men and 3-5 years for women), the pre-treatment state should return so you would have to go through the entire dermroller treatment all over again. Microneedling induces wound healing and the release of inflammatory molecules that can stimulate hair growth bringing hairs that have stem cell present back to functioning and into the anagen growth cycle.