Anabolic Effects of Testosterone Are Preserved During Inhibition of 5α-Reductase

    Stephen E. Borst, Christine F. Conover, Christy S. Carter, Chris Gregory, Emanuele Marzetti, Christiaan Leeuwenburgh, Kristin Vandenborne, Thomas J. Wronski
    TLDR Testosterone can build muscle and bone without enlarging the prostate when a specific enzyme is blocked.
    The study investigated the effects of high-dose testosterone combined with the 5α-reductase inhibitor MK-434 on muscle, bone, and prostate in 40 rats over 56 days. Testosterone increased muscle mass, strength, and bone density but also caused prostate enlargement. MK-434 effectively blocked prostate enlargement without hindering the anabolic effects of testosterone on muscle and bone. The study concluded that the anabolic benefits of testosterone could be preserved while mitigating prostate-related side effects by using a 5α-reductase inhibitor, suggesting potential applications for older hypogonadal men.
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