Despite reports like this
http://www.abc.net.au/health/thepulse/s1531372.htm I am a convert!
Me and the missus did a 14 day over the counter detox where you stick to a very very boring and natural diet plan and take heaps of the tablets before and after each meal. no meat, no dairy etc etc.
My only advice is don't stray to far from the smallest room in the house for the first couple of days!
I would (and should) do it again - I never felt better. I felt healthy, the whites of my eyes were white, I was regular (sorry), I lost a little weight 2kg (the wife lost lots 6kg).
Good luck sticking to the plan!