And Rogaine. It was also created to treat High BP as a powerful vasodilator. Turns out it made you hairy too. Maybe we should spend all of our R&D pursuing High BP -- who knows what other ailments we'll cure!
If you have in-grown hairs, take Viagra once and they'll start coming out in a few hours on their own or with minimal mechanical force. The effect continues for a day or two so I am sure even the secondary metabolites might be somewhat active in inducing this effect.