Yes, I have. Metabolife, Xenadrine, Hydroxycut, all pretty much slightly different variations of the same theme. You have to be very careful to follow dosing instructions. If you overuse, you can overtax your adrenal glands and end up GAINING. Also, the labels themselves indicate anyone with anxiety, depression, heart problems, hypertension, and a number of other issues should NOT take the product without consulting a physician. I don't think if you are hyper you should take these products. They contain ephedrine and caffeine. Also, in my experience average weight loss is pretty minimal- 5 to 10 pounds. You might consider other products on the market that do not contain (ma huang) ephedrine or caffeine. Some of my friends, especially the slender ones, report feeling really jittery and "jacked up." I think these products have a place, but only if you educate yourself and take the products responsibly. You sound like maybe you are not the best candidate for these course of therapy. IMHO.