You need at least some pg to properly dissolve the minoxidil. Solutions that are higher in alcohol content tend to evaporate very quickly leaving undissolved minoxidil residue on the scalp. I'm guessing that the current standard formulations of 30% alcohol, 50% pg, and 20% water was determined to be the most efficient vehicle for maximum benefit. Dr Lee used to make some nice 5% formulas however that were 50% alcohol, 30% pg, and 20% water. They dried quick and didn't leave the hair greasy but did tend to leave a bit of residue.