Mesterolone (also known as Proviron) is a modified form of dihydrotestosterone (DHT) for oral administration, distinguished by the addition of a methyl group at the C1 carbon position, which helps protect the hormone from hepatic metabolism during oral administration. Similar to dihydrotestosterone, mesterolone is a potent androgen with weak anabolic activity. Schering is believed to have developed Proviron in 1934, making it an extremely old drug in the world of steroids. In clinical practice, it is used to treat various types of sexual dysfunction, which are often caused by low levels of endogenous androgens. Bodybuilders use mesterolone to increase muscle hardness and density. The main benefit of mesterolone for bodybuilding is the significant reduction of sex hormone-binding globulin (SHBG); in fact, studies have shown that mesterolone is able to bind to SHBG much more strongly than any other steroid. Lowering SHBG levels increases the amount of free (bioavailable) testosterone and other steroids, which significantly increases the effectiveness of a steroid cycle. Athletes primarily use mesterolone to increase androgen levels during diets or in preparation for competitions.
Chemical name: 1α-Methyl-17β-hydroxy-[5α]-androstan-3-one
Formula C20H32O2
Anabolic activity index 150%
androgenic activity index 40%
Mesterolone (also known as Proviron) is a modified form of dihydrotestosterone (DHT) for oral administration, distinguished by the addition of a methyl group at the C1 carbon position, which helps protect the hormone from hepatic metabolism during oral administration. Similar to dihydrotestosterone, mesterolone is a potent androgen with weak anabolic activity. Schering is believed to have developed Proviron in 1934, making it an extremely old drug in the world of steroids. In clinical practice, it is used to treat various types of sexual dysfunction, which are often caused by low levels of endogenous androgens. Bodybuilders use mesterolone to increase muscle hardness and density. The main benefit of mesterolone for bodybuilding is the significant reduction of sex hormone-binding globulin (SHBG); in fact, studies have shown that mesterolone is able to bind to SHBG much more strongly than any other steroid. Lowering SHBG levels increases the amount of free (bioavailable) testosterone and other steroids, which significantly increases the effectiveness of a steroid cycle. Athletes primarily use mesterolone to increase androgen levels during diets or in preparation for competitions.
Chemical name: 1α-Methyl-17β-hydroxy-[5α]-androstan-3-one
Formula C20H32O2
Anabolic activity index 150%
androgenic activity index 40%