Worst thing about increasing your testosterone too much is that your body will try to compensate and produce estrogen, which you have to try and prevent otherwise:
I use some phd stuff, which i find really good. Also take reflex casein protein overnight. Seriously tho, supplements are just that and diet and training are more important. You can take all the supplements under the sun but if you're not eating the right foods you're throwing your money away. Also different supplements work to varying degrees on different people, so do a bit of trial and error.
Was it in the 'doctor doctor I got a rash' section?