Masterolone, also known as mesterolone, is a synthetic anabolic-androgenic steroid. This substance is a derivative of dihydrotestosterone (DHT) and has various applications in the medical and bodybuilding fields. Below is a brief description of this substance and its characteristics:

Chemical characteristics: Masterolone is a modified form of dihydrotestosterone. It has a methyl group on carbon atom 1, which makes it more resistant to enzymes, such as aromatase, that convert androgens into estrogens.

Anabolic-androgenic effects: Masterolone exhibits both anabolic properties, i.e. increasing muscle mass and strength.

Medical use: In medicine, masterolone has been used to treat a variety of conditions, such as low testosterone, impotence, and breast cancer.

Anti-estrogenic properties: Although not a classic aromatase inhibitor, masterolone can have an anti-estrogenic effect by competitively binding to the estrogen receptor. This can be useful for problems associated with over-aromatization of other steroids.

No conversion to estrogen: Masterolone does not convert to estrogen, meaning it does not lead to water retention or gynecomastia, problems often associated with other steroids.

Short half-life: Masterolone has a relatively short half-life, which means it can be used with more flexibility in steroid cycle plans.