I'm fairly skeptical of fads and most claims by others of any sort that seem too good or too easy or too self-serving to be believed. I've been ready, going on a year now, to concede that my estimation of the benefits may have been skewed by simple wishful thinking. No, the cool-down does not lead to increased hair growth but, every time I step into the shower feeling like a used rag and ready to succumb to a bone-deep, will-sapping lassitude, despite the previous evening's big plans for a bike ride, feeling as never before like I will discover it's was all just a big, self-deluding illusion, I remain amazed every time how I step out of the shower with an attitude of such great expectations and ready to undertake any challenge-- big winds, hot, humid, cold, looking like rain... bring on the hot coffee!