I think the important thing to note is the study ends at week 96 (treatment stopped), and the minoxidil group still retains a + 20% increase in hair weight , whereas placebo resulted in a -10 decrease ... that's a 30% swing. What happens for the first 12 to 16 weeks (+50% !) to cause it to progress so well, plateau and then drop? ... well eventually everything reaches a peak (can't progress forever), and it's perhaps not surprising that some 'negative' adjustment occurs which erases 1/2 the gain. But clearly it does help and this negative adjustment does not render minoxidil useless in the long run. Perhaps a poor analogy: often an unknown pitcher can do exceptionally well against a team for the 1st start, but once they 'understand' him things fall back to the norm. The body adjusts ... the drive by the body to maintain the equilibrium (or genetically programmed slow decline) it had before the minoxidil has to play a role here. minoxidil is not strong enough to overcome that on its own.