And, if you can't find Redken stemoxydine to use as a vehicle, the L'Oreal one and the Garnier one (although I've read it smells a bit - Redken smells great!) most likely will work just as well, although I've never tried them so can't say categorically. As I write this right now the Garnier one sells on eBay US very cheaply in 2-packs and 3-packs. Personally I think anything with a bit of alcohol in it like commercial minoxidil liquids (not the foams) will work, but I will leave that up to others to experiment. If you want to use something cleaner and more bare bones, and something more resembling what they use in trials then I think ethanol (search "90%+ rectified spirit" if ethanol doesn't appear to be available in your country) + propylene glycol (PG) is meant to be pretty good, but I don't know the right amount of each to use.