I used this product for some time and found it very effective for weight loss and increased energy. In fact I've tried several and belive I recited the highest level of results with stackers. However I also experienced chest pains, sever anxiety, sleeplessness and began to find that I could not function productively without them. I quit using them long term as the negative effects outweighed the posture results. Now though I use them to Jumpstart my diet (after vacation or holiday eating times) and use them for no more then 3 to 5 days during that rough time of aclamating back to health eating. So long story short great product but easy to abuse. It would be best to consult your Dr first and of course only use if you are not prone to addiction and have are able to exercise self control.