I don't know how, or why, but I think this stuff actually works. I've always had very thick and fairly healthy hair. However, I do dye it monthly, and after switching dye kits for a few months, I noticed some significant thinning :-( I switched back to my old dye, and went on a hunt for something to bring my hair back...
I read the reviews on this, and thought I'd give it a shot. It really made my hair feel fuller and thicker, almost too soon! It made me think there is some kind of thickening agent in there. That's fine, with me though. I figured, even if nothing grew, I would probably continue to buy this as a volumizing spray anyway ;-D But it did grow! I wish I'd measured. It grew so much, that the woman at my local bakery noticed, and said, "Hey, your hair got long out of nowhere!" I would also like to note that I have a fairly sensitive scalp, and oily roots. This product did not irritate my scalp at all, nor did it make my roots any worse. I just ordered 2 more bottles.