Propecia does not work to improve blood flow. Minoxidil might to an extent. It is a potent vasodilator after all. Presumedly it acts on blood vessels in the scalp and improves blood flow through them. They don't know exactly how / why it causes hair to regrow though. The general theory though is that it works by opening up potassium channels.cateyes81 said:what about minoxidil or propecia?
