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Proviron Mesterolone CAS:1424-00-6 Delivery: Express courier. Storage: Shading, confined preservation Appearance: White crystalline powder. Usage: Mesterolone is used for the treatment of male hypogonadism and decreased sperm infertility. Mesterolone had seen widespread use in bodybuilding primarily for antiestrogenic activity in anabolic steroid stacks but such use has declined after introduction of aromatase inhibitors and SERMs. Most significant benefits of current Mesterolone use are considered to be maintaining libido off-cycle and also relatively and temporarily improving vascularity.