I've been drinking a Redline or a Speed Shot early in the morning for the past two months about 4 times a week. I'm drinking it in place of coffee b/c I was tired of coffee. I just read that fat burners can mess up your metabolism in the long run. I hope I havent done any kind of damage. Last year I took 25mg - 50mg of ephedrine here and there for about 4 months on days I felt tired and or didn't get good sleep the night before. So I'd intake ephedrine not everyday ... but maybe every other day or couple of days. I'd make sure that I didnt take more than 50mg a day. I'm kinda paranoid. Does the body's metabolism re-regulate itself when you stop taking those fat burning stimulants?