This....i would be very nervous taking any meds that werent from a pharmacy .The was a UK BBC TV programme on this that came out last week (saw it online) DONT BUY THEM. In the best of them they were recut with chaulk or calcium powder. You dont get the effecct. The worst they found was a silica based powder and that was likely to cause major stoach issues including poisoning, many tabs were found to be made in Asia and eastern block. You got to get it from a reptable outlet.