Iv been rolling 0.5mm daily since end of July. Applying minoxidil straightafter rolling. Tiny vellus hairs are popping up with the odd one growing slightly longer. Thinking about going deeper and doing every 1 to 2 weeks
Rollers don't wound anywhere near as effectively as pens, you can buy a 1.5mm ZGTS roller(best brand imo) and use it with mild/moderate pressure at night before applying minoxidil, you don't really want to bleed just mild redness and maybe a few blood spots, the redness should not be noticeable in morning. I know follica put a lot of money and research in to their studies on this but i still think this is the best method.