I have been taking the ECA stack for 6 weeks. Results have been good. Amazing loss of fat, particularly in hips, upper thighs and ab area. I work out 3-4 times weekly and have for 2 1/2 years. Couldn't loose fat in the above mentioned areas until started ECA. I had considerable jitteriness for first few days but this has subsided and is now non-existant. I have started to show some actual weight loss on the scale over the past couple of days. I have read that after 6 weeks of continuous usage, fat loss increases. I am very interested in hearing from others on their experiences with the ECA. I would like to find out if others have lost a great deal of fat and have increased muscle with no real weight loss. I would also like to know if anyone has found that fat loss increases after about 6 weeks usage. Also did anyone have problems with the yoyo effect after terminating usage? Experienced users please reply.