Synthetics (like Testim, Androderm, Androgel, etc...) to raise testosterone do do as such, and very successfully I might add. But they can also cause a sperm count of Zero. That's the primary issue the hubby and I are dealing with right now.
So, yes, they cause Testosterone levels to raise, but they also kind of defeat the purpose if the reason you're raising said levels is to aide in conception.

Vicious cycle sometimes, isn't it...