So you mean you were a non responder to minoxidil? Now that you added microneedling your getting slightly visible results at the 2 month mark? I just want to make sure I understand. Tretinoin 0.1% might be way too much. I think the usual dosage for hair to avoid vitamin A overdosed follicles, skin irritation, and increased sulta1a for better minoxidil efficacy is tretinoin 0.01% - 0.025%. Retinol might be good at 0.1% because it has to go through a three stage conversion process before being converted to retinoic acid or generic tretinoin. Only a small amount of retinol turns into retinoic acid. At least that’s what the stuff I have been reading claims.