I have wondered about that also. I started to buy the Green Coffee Bean when I read on the label that if you ever had your blood pressure drop not to take it as it could cause this and make it drop to low. I talked to my Dr. and she said when on medications never take anything like that until talking to your Dr. so I have not tried it. On one of DR. Oz's shows when they were talking about that and a syrup that was supposed to do the same thing a weight Dr. said he had never found that they worked in his practice. I feel that if it was all that great it would be selling like hot cakes and we would be seeing a lot of people loosing a lot of weight. I am 75 and my Dr. said it is very hard to loose weight at my age.