Does anyone have any information on this herb that supposedly helps testosterone levels and builds muscle? There is a supplement made by Nutrex called Vitrix.

You may want to check out the post linked below.
http://www.liftforlife.com/forums/showthread.php?t=1024&highlight=Tribulus

Test elevation is very mild with trib, however it is your own and not synthetic.
If you have the bucks for a quality standardized trib, its worth a shot.

Keep in mind however,,,,,,,, MILD,,, you won't notice much.

Lift

I agree. I have taken a few different Trib. supplements the results are definately mild. These supplements might help but don't expect too much from them.