Hey Lumo, just to let you know I took some Tribulus Terrestis a few years ago, it came in a pill with androstenedione. It was one supplement that I could definitely feel was doing something after being on it for a few days.
I think it helped me lift a bit harder, and may have helped me get a tad stronger, but there were side effects for me. I am normally pretty laid back and after a while I noticed some changes in my emotional state. I got angry a lot quicker. There were several times when I was contemplating violence on others. Also when i cycled off the stuff I was moody like a chick for a few days. Not a ride I enjoyed. Protein, creatine, vitamins and a couple other supps are all I take now.
Good luck with supplements, it’s a real crap shoot out there.