You didn't know that? It will also cause one leg to grow if shorter than the other, strengthen your fingernails, put an end to bad breath, increase the alcohol content of near beer and end your problems with split ends (not if you're blond though, but then it will prevent your hair from turning green............ possibly not a side effect wanted by little old ladies.......... oh wait, that would be with pink). It can also help if your dog has fleas, or you want to lighten the color of the paint on your house (if your spa is close enough). Don't even get me started on the aviation bennifits......
Seriously, that's the biggest crock I've ever heard.