[therein]

I mentioned this before in HN, will mention again. There is definitely something about vasodilation and hair growth/mobility, especially when it comes to in-grown facial hair.

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.