I don't believe what that website says. One can just about did me in. I was drinking Amp one time. It was a slim can, probably only 8 oz. About halfway through, my upper back started to REALLY ache. When I finished the can it was horrible. It was hard to sleep that night. It was still achey the next day, but started getting better. I will never drink another "energy" drink again. I don't know for sure if it was Amp or not, but I'm not going to take any chances. I'll just stick with normal pop if I want any caffeine.