Active Life: 8-12 hours
Detection Time: 5 weeks
Chemical structure: 1 alpha-methyl-17 beta-hydroxy-5 alpha-androstan-3-one
Dosage: 25mg
Appearance: 100 tablets

Mesterolone is an oral androgen which is not capable of aromatising. It is used in the medical world to treat different forms of sexual dysfunction. Sexual disinterest, impotency and low sperm count can be successfully reversed with the treatment of this drug, which acts as a substitute for the natural male androgen.
Although this steroid has little benefit for its anabolic properties, it does hold some very useful characteristics which can aid a bodybuilder. Due to the compounds high affinity for plasma binding proteins such as SHBG, it is believed the drug can aid the effects of other steroids by increasing the percentage of unbound free concentrations.
Also of a great benefit of mesterolone is its action as an anti-aromatase within the body. This works by slowing or stopping the aromatisation of steroids into oestrogen. This is not to be confused with the action of the likes of nolvadex which work by blocking the oestrogen binding and activating the tissue. The anti-aromatase is thought to work by the ability of the drug to compete for binding to the aromatase enzyme, thus temporarily blocking the enzyme to interact with other hormones. This effect is obviously much more profound than the actions of nolvadex and other anti-oestrogens, which do nothing to actually reduce the level of oestrogen being produced, rather just block its ability to activate tissues. Many may choose to use both an anti-oestrogen and an anti-aromatase so to inhabit oestrogenic side effects via both methods. Dosage of 50mg each day of proviron will likely hold off side effects such as gynecomastia when using aromatising steroids.