There are no better 5-alpha reductase inhibitors on the market for hair loss. Finasteride causes DHT levels to drop by 60%. Meanwhile, three 5-year Finasteride studies showed 9/10 participants saw their hair loss stop – and more than 3/4 experienced hair regrowth. So, yes, Finasteride does really reverse hair loss. It is an FDA-approved treatment for MPB, and it is used by thousands of men in the UK.