II have use this Clen before back in my wanna be "body building days". I bought it when I went to Mexico for vacation and I did not like the the feeling when I was on it. My body temp was a little high, I was very jittery and I did not notice any weight loss or increase of energy. The reason why I stopped using it is because it caused insomnia which I battle with everyday. Besides Clen is very similar to ephedrine as for side effects.
Your best bet on losing weight is eat very slow to allow your stomach to shrink. I loss 15lbs taking Straterra and Concerta for ADHD so if you have adhd you can talk to your doctor.