I'm suprised Matgallis that you havent had any irritation with xandrox and xandrox with retin-a. I had peeling and burning for the first time with that stuff. But I also had been using spironolactone and more minoxidil and had been unkind to my scalp for a couple of weeks before that.....so never mind.
Ive been using his spironolactone 2% for my diffuse areas and his spironolactone%5 for my front hairline in the morning. I put it on a couple of hours before showering. I tried to put it on at night but my girlfriend asked me what I had eated the night before......you know. Anyway, Xandrox15 after my shower and his minoxidil 5% at night with retin-a (amoung other things). Anyway I've been using his stuff for about a month and I got a good shed so I am hopefull.
Anyway, if you're contemplating using his stuff I would recomend you poke around his site for a while and get an idea for the science of his stuff and how to use it. He's also acually relativly cheap.