My new pharmacist said a trainer friend of his was complaining about low T. He asked if he was using any supplements. And he was using something along those lines. I didn't catch all the things he was talking about but i did hear something about DHEA and he told him his body was fooling him into thinking he had plenty of T and shut down a lot of his natural production.
Not sure I got the pharmacist's story right, but maybe PeakT has some ideas.