A microneedling for hair loss treatment is exactly what it sounds like: A hair care professional will run a manual or motorized device equipped with fine, tiny needles across the scalp, which will penetrate just into the upper portion of the dermis — the layer of lies. It helps stimulate blood flow and collagen production, but more significantly, it creates "microchannels" that enable topical treatments for hair loss, such as minoxidil and finasteride, to be more effective