The exact mechanism behind how Minoxidil leads to hair benefits is not fully known. But, we do know that Minoxidil can increase the size of hair follicles and extend the hair growth phase, this may be what is behind the increased hair growth. We also know that Minoxidil can relax the smooth muscles inside your vessels, increasing blood flow (which is how it works for blood pressure reduction). This increased blood flow to the scalp may be part of the mechanism of slowed hair loss and potential increased growth.