I have a co worker that has a history of hyperthyroidism at a graves disease level. He under went oral radiation treatment 2 years ago and he now believes he is in a state of hypothyroidism. He has gained a significant amount of weight over the last two years. I have been helping him get on a decent diet but he is discouraged about the results. Normally I wouldn't recommend someone to just start taking an ECA but I believe if he starts to see results he will work harder at his exercise and diet. My question is, is it dangerous for him to be taking an ECA with his past thyroid problems? I have researched a bit on the web but most of the sites I have found basically talk about how dangerous ephedrine is period, and we know that isn't true. Thanks in advance.