Package: (50 MG/60 TABS - PACK)
Brand name: Provimed
Manufacturer: Bayer Schering
Active substance: Mesterolone 

Proviron by Bayer Schering has activity as a strong androgen which does not aromatize into estrogen. In medicine is used for treating diseases and reproductive system problems that result from low levels of own testosterone, reduced libido, impotence and oligospermia.

Proviron has weak anabolic properties and therefore not be used to increase muscle mass. It actually increases the effect of the other steroids in cycle. Mesterolone has a strong affinity to binding with proteins in the blood as SHBG (sex hormone binding globulin), which allows the greater part of other steroids can be in its free (active) form.
Proviron is used primarily as an anti-estrogen. Most practitioners prefer in fact the combination of Tamoxifen and Proviron to stop the aromatization of steroids, because this two drugs attack estrogen in different ways, complement each other.