Proviron Mesterolone Oral Anabolic Steroids CAS 1424-00-6 C20H32O2
CAS No: 1424-00-6
Einecs No: 215-836-3
Appearance: white crystalloid powder,soluble in acetone, ethanol,
ethyl ether, ethyl acetate, insoluble in water.
Proviron (mesterolone) is an interesting anabolic steroid, though
it is not of much value to bodybuilding. It seems that the most
for many to consider including it in a steroid stack is for
anti-estrogenic activity. In the days before anti-aromatases and
the use of SERMs
(selective estrogen receptor modulators) such as Clomid and
Nolvadex, there was some merit to this.
Proviron was popularized years ago as an anti-estrogen because it
is has a high affinity to bind to the aromatase enzyme, so anabolic
users could use it to serve as their AI (aromatase inhibitor)
replacement. Bodybuilders were using it during post cycle therapy
unfortunately, studies have shown proviron does suppress LH
(luteinizing hormone) – in some cases. As a result, high proviron
dosage can prevent
the pituitary gland from recovering after a steroid cycle. Some
users insist proviron does not suppress the HPTA when used in PCT
or during a
bridge; however, this is up for debate. As a side note, some
studies support long term use of proviron at high dosages without
suppression. The science supports proviron use for PCT but not in
Now that we have aromasin, arimidex, and letrozole, proviron has
become obsolete when it comes to anti-estrogen usage. We know that
aromatase inhibitors (AI) are safe to use during post cycle
therapy, and will not suppress your HPTA.
Though, proviron shouldn't either.
In this respect, it doesn't mean proviron does not have its uses on
cycle when using an aromatizing compound such as dianabol,
nandrolones, or equipoise. In fact, a user can expect to have a
harder look, more vascularity, and less puffiness when stacking
proviron with a
Another benefit of proviron is that it binds very well to SHBG (sex
hormone binding globulin), which is the hormone responsible for
testosterone circulating in the body. This is probably the reason
why some use proviron during PCT.
Those that compete will appreciate proviron's hardening properties.
Since proviron is 5-alpha reduced and not capable of forming
estrogen, it will
help give a drier look.
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