from the
Guys
http://www.ag-guys.com/arimidex-vs-aromasin.htm
Aromasin basically is an aromatase inactivator...It actually makes estrogen receptors useless in a sense, because it inhibits the aromatase enzyme from creating more estrogen. This is like having a wall socket but no radio to plug into it…kind of useless, right? Instead of just inhibiting production (as a Type-II anti-aromatase would do) it irreversibly cuts off estrogen production from the enzyme it attaches to. Aromasin can also cause androgenic sides, so it’s not ideal for women, however. It’s not particularly harsh on cholesterol, and can be effectively used with Nolvadex. I’ve seen studies indicating that it reduces estrogen in your body by about 80%, possibly making it too strong, for maximum gains and staying healthy on a long (12 weeks or more) cycle. Aromasin, at 20mgs/day, will raise your testosterone levels by about 60%, and will even help out your free to bound testosterone ratio by lowering your body’s levels of Sex Hormone Binding Globulin (SHBG), by roughly 20% (The Journal of Clinical Endocrinology & Metabolism Vol. 88, No. 12 5951-5956)…
It’s perfect for use in PCT, for many other reasons (it interacts more favorably with Nolvadex than other AIs).[/B]But it’s not 100% what we want during a cycle…for this reason, I give it a strong…
Armidex
From the research I've done, this seems to be the best ancillary compound around for use on a cycle. First off, 1mg per day of this stuff (J Clin Endocrinol Metab 2000 Jul;85(7):2370-7 ) was shown to decrease estrogen by about 50% and increase testosterone levels by 58%. That’s a level of estrogen suppression I’m very comfortable with on virtually any cycle. Interestingly, that same study showed that those results were had with .5mgs/day as well. So, since you can elevate testosterone, lower estrogen (but not excessively), and keep healthy joints and lipids, and do this at a half mg per day, I give this my highest rating for an ancillary product to use on a cycle