While Mesterolone Proviron itself comes with minimal or even no
noticeable testosterone suppression at doses that are effective for
performance enhancement, almost everyone will use this steroid with
other compounds that do suppress natural testosterone production.
Therefore a PCT plan will still almost always be required to get your
normal testosterone function stimulated again and to avoid falling into a
state of low testosterone where muscle loss and fat gain occurs, among
other serious symptoms.
Mesterolone itself is sometimes utilized in PCT since one of its medical uses is to enhance fertility. By using Proviron in PCT to reduce estrogen, the recovery of testosterone might be improved but this needs to be weighed up with Proviron’s tendency to mildly reduce natural testosterone
So while some people might choose to use Mesterolone Proviron during PCT because they can’t access other better PCT drugs like SERMs, it is generally not advisable for best results.