Though tribulus has been proven to have little to no effect on test production it's still on my short list of personal favourite supplements. I just get an awesome sense of well being,libido and natural energy while using a quality tribulus product. Been using it at times in various forms for 15 or so years and it has never failed me. Different bodies respond differently to different stimulus and I can say 100% my body knows when I'm on tribulus. I do tend to avoid test boosters with a proprietary blend of ingredients as I like to know exactly what each products cause and effect is. Most other test boosters I've noticed no or negative results. ZMA w melatonin is decent for deep sleep recovery also and has helped me in the past