I bough one as a cart filler one day in order to make the $25 total for free shipping on a website; and it was called "like a virgin".
I tried it and didn't notice any difference, it didn't smell good and it looked like yellow pus.
I think the theory behind them is that he chemicals like aluminum and sulfates blocks the moisture in the areas you rub it on so you really are not tighter, just dryer.. so you get more friction.
I did see one made more organically a while ago but it's still the same concept. Keigel balls work better and are healthier IMO.