Hi, I'm proir user of Xenadrine (original formula), I'm not able to take the Ephedra free it gives me migraines.... But as far as the original formula, I lost 30 pounds.... So, it worked for me, the key is to drink lots and lots of water; like 8+ glasses a day... I did hv a little bit of the jitters but nothing to bad, I just decreased my intake, and after a week increased it to the recommended dose.... Good luck!