I don't have the studies at hand right now but what I remember is, yes, it actually does increase hair count in a predictable and statistically significant way but unfortunately not really in a cosmetically significant way. We're talking something like 1-2000 hairs at best iirc and that's the kind of amount that won't make too much of a differnce if we're talking about the entire scalp.
Just to bring attention back to the original question, does anyone think there would be an issue with mixing minoxidil and stemoxydine liquid in one application?