Are supplements that claim they block fat and develop lean muscle safe?

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This question is from Terry and she asks, are supplements they claim they block fat and develop lean muscle safe and what happens when you stop taking them? Does the fat return? Well, Terry xenical is the only over the counter fat blocker approved for use by the FTA and xenical is sold in stores under the brand name Alli, When you stop taking Alli, if you go back to your old eating habits, yes chances are you'll probably end up with more fat on your body and less lean tissue.

Thank you Terry.