Preparation H... new water weight burner???

Saw it on a site.. googled it.. people say it really works.. drs. and everything.. wondering does rubbing it on a part of you.. wrapping yourself in saran wrap and sleeping overnight with it cause you to temporarily lose water weight?? You tell me.. sounds true to me.. I mean think about it... just google it and see what people are saying. but do you think its a good idea?