My experience with Proviron is it does not shut down test levels, I have been taking 2/day for two months or so. I think this is a great drug, at least for me. It seems 1-3/day are about right. If I get too much it becomes harder to sleep at night. At any rate I just kinda adjust the dose to how I am feeling and what I think I will be doing with my time (there are times when a little more has its benefits). I generally stick to 2/day, although lately, I can get by with less, which is probably a good thing. All in all I feel great with this in my diet.
Last fall and early winter after prohormone cycles I got shut down hard (I believe it was not the 1AD that caused the biggest problem - it was extendeding the cycle past the 1AD with another cycle which included nandrolone precursors and 4andro, for a total of about 16 weeks). The other thing, at least for me, that can delay recovery is circadian rythms tend to get disrupted in winter. At any rate it was a long road back and I learned alot, one of the main lessons maybe for me, at 42, Proviron for life.
Now, would I mix it with 1AD? Well, probably not, but I would have it right on hand for coming off cycle, or depending on cicumstances, when sex drive starts to seem too low (although there is always Viagra for immediate).
The other thing, is that the lack of estrogen theory behind this sex drive issue does not seem quite right to me. I would be curious if there could be some sort of receptor over-stimulation, or depletion of say neurotransmitter, like dopamine, after a period of time on the 1AD. See when I was on the 1AD I always got lots of morning wood but just did not have much desire for sex. Seems like something going on in the brain.
Well, look forward to any more feedback from other guinea pigs.