Doing dermarolling and minoxidil with 1 mm needles for year now, didn't get anything. I think the microneddling is trash that was put forward by some paid ids .thinking to stop it.
Rollers are unlikely to work as 192 pin would have to be rolled out completely 1666 times to get the 1600 wounds per cm2 on a average scalp area in a perfect set of passes so would prob need 2000 rolls plus in reality per session
