Arimistane - Estrogen BlockerArimistane Estrogen Blocker As a metabolite of 7 Keto DHEA, Arimistane (Androsta 3,5 diene 7,17 dione) does not convert into estrogen or testosterone. Arimistane, like Aromasin, acts as a suicide aromatase inhibitor (AI). Therefore, means it binds permanently to the aromatase enzyme and prevents any estrogen rebound. Additionally, it has been shown to decrease cortisol, increase LH (luteinizing hormone), and increase testosterone levels. + As a