I take human grade Clenbuterol from Bohringer-Ingelheim at 250mcg. I'm a heavyweight, so that's what it takes for me to feel sides. Actually, the first time I took Clenbuterol, I rapidly lost about 5 pounds, then the weightloss stopped. Cramping was awful for the first week that I took it, but after that, it wasn't so bad. I've been taking it for 2 months straight with Ketotifen. My body is highly resistant to weight loss, and Clenbuterol isn't actually helping me much at all. I maintain a strict diet and work out 7 days a week and usually just maintain weight. Clenbuterol, however, is known to increase feed efficiency. It's supposed to increase muscle and decrease fat at the same time. Whether it's doing that or not I can't actually say. What I will say is that Ephedra w/ Caffeine is superior in the fact that it completely destroys my appetite. Once I take 24mg of Ephedra and 200mg of Caffeine, I can practically go the whole day without eating any food. This allows me to choose much healthier food to eat, and it lets me choose when I want to eat.