Originally, the drug Minoxidil was created in 1950 to treat ulcers. When it failed, they decided to market it as a circulatory aid. It was given to men with high blood pressure, and they found that these same men were growing hair all over their bodies

So they turned it into a topical treatment and called it an anti-hair loss drug.

So, beard-less men wondered if it would work on their beards too. Well guess, what, it does. Like, really works.