Proviron acts as an anti-aromatic: it prevents the aromatization (transformation) of anabolic steroids into estrogens. It thus avoids the gynecomastia. It can be combined with Nolvadex to increase its effectiveness.
Proviron and Nolvadex are two anti-estrogens whose mechanisms of action are different and complementary, and it is for this reason that the combination of these two products is so effective: while Proviron prevents the use of anti- aromatization of anabolics, Nolvadex obstructs the receptor cells of estrogen, preventing it from acting. It is therefore a formidable tandem.
Proviron is not only an excellent anti-estrogen : Maintaining a low level of estrogen, Proviron also reduces water retention. It gives the user the ripped look sought by many bodybuilders, especially when preparing for competitions.
It should be noted that Proviron tends to limit the muscular gains due to a steroid cycle because it attaches to the androgen receptor cells in place of the other steroids present in the body, which then remain blocked outside and therefore without effect. This is why many bodybuilders take a minimal dose of Proviron, just to avoid gynecomastia.
As for the side effects of mesterolone, they are rare below 100 mg per day. Indeed Proviron tablets are not alpha-alkylated 17 and are not harmful to the liver. On the other hand, if one begins to exceed the 75 100 mg per day, we often see phenomena such as priapism (painful situation in which the penis after erection does not find its normal flaccidity) in humans or virilization in women.