I heard this on the radio the other day also...it has to be a scam. hastur said pretty much everything I was thinking.
I rarely take pills...even for headaches/allergies/whatever. I never get relief from them, so there's no point in trying. Sleep is the only thing that cures my sicknesses.
I was about 5' 6" until I was about 15, and then I grew 8 inches in two years. It sure didn't happen because of Heightmax...it's called puberty.
(Yes, I understand 15 is a little late, but hey...some people start later than others. It doesn't matter as long as the end result makes everything work.