I'll go a bit into detail here.
- I'm having minor success up until now. Like 20 new terminal hairs at hair line after 6 rolling sessions. The big question is: Is this only the vanguard, i.e., are more to come at a higher speed, or is this like the typical ratio, i.e., 20 new terminal hairs per 6 rolling sessions? It's too soon to answer that question, but there definitely is some effect. The only thing that matters is: Is that effect big enough for this to be a reasonable treatment? I dont wanna rape my head on a regular basis for weeks to come.
- Amazon
- Unfortunately, tumor formation risks are increased, but nobody knows how much exactly. Also, if you're not desinfecting your roller correctly, you might get infections into your scalp. Desinfection of the roller is pretty easy and cheap though, using rubbing alcohol (IPA) which you can get for 7$ at your local pharmacy.
- Multiple modes of action have been proposed: 1) fibrotic collagen destruction and subsequent remodelling of adjacent areas with "correct" tissue, 2) wounding to induce growth factors, stem cell delivery and cell profilation for repair and reactivation of damaged and dormant hair follicles. It may be both of these effects or only one of them.