Pure Minoxidil

Can one buy pure minoxidil powder/crystals?
Google only brought up the usual Alibaba stuff from China.

I'm want to add minox to a home made topical I'm toying with.
I can't pour what I already have into a Kirkland/whatever minoxidil bottle. I need the pure stuff.


I'm aware of that this is a natural hairloss site, but at least the rest of what's in my topical is natural.  
After seeing the dermarolling + minox study, I've decided to give minox another shot.