I'm in the middle of doing a cleanse from East West. My Dr. suggested it. Loads of celebrities do it before a big shoot/movie/event. It's nothing like the master cleanse or anything like that, it's a legit way of eating combined with certain kinds of supplements. I'd been struggling with injuries since September, and in that time gained fat, and lost muscle. After all that, I needed something to jump start my system.
In the cleanse you work with a consultant once a weak to help you with shopping lists, recipes, weekly meal plans, and you accountability. I'm on week 3 and I've lost 13 lbs, feel awesome, and look much healthier. It's done pretty much exactly what I wanted it to do, get me back into a healthy living groove.
Only downside is, it's not cheap, it's like $450 for the month of consultations, supply of bars, cleanse and protein.