Ephedra is very effective at least it was for me, but it's side effects were also very real and dangerous. I was looking for an easy weight loss booster and this was it. "Ephedra P57" killed my cravings, sometimes I would forget to even eat meals. I was losing about an estimated pound every day to every two days! I was working at the time and I seemed to have a never ending supply of energy! Sounds great right, wrong very wrong. It was about fifteen days into the diet on "Ephedra P57" when I totally crashed from the lack of sleep and nutrition! I realize now it was like I was doped up on speed or something. I couldn't wake up, it didn't matter what my husband did he couldn't get me to wake up! I was asleep for about thirty six hours it almost cost me my job. When I did wake up I felt horrible and ashamed, I was sick. To top everything off I gained the weight back! Effectiveness You'll lose but when you stop it will come right back on! Side Effects Ephedra P57 is like speed it gives you energy causes sleep depravation. It also causes a giant crash after a week to fifteen days then you hit bottom. I gained all of it back.