There is also research in pre-menopausal women. As Sassy69 siad, Nolvadex is almost certainly useless unless you are already very lean, and Arimidex only decreases estrogen by 25-35% (at high doses) which may or may not give dramatic body comp results. Arimidex should also raise a pre-menoapausal women's T levels, not sure by how much. Let's just say I've yet to see a study that showed giving Arimidex to pre-menopausal women caused them to lose fat...but then again the women thay give this stuff too are not likely to be dieting bodybuilder types on average!