Thought I'd chime in on this one since I'm always so positive about Proviron...

I ran it after my last cycle from half way though the cycle when my nips started acting up all the way though my clomid and it made all the difference in the world...

It's true that it can shut down your natural test, but it more then made up for that by keeping my estrogen levels in check post cycle until my body starting producing natural test again...

For me I didn't really see where it shut down my test production at all... Plus it keep your sex drive in OVERDRIVE and that can only be a good thing