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Ma Huang!!! U mean that Ephedra shit! Man that makes your heart beat way too fast. Especially mixed with caffeine , citrus aurantium and other shit. I took Proburn once before a competition. After my first fight my heart was going wayyyy too fast. Scared the shit out of me. Felt really dizzy like I was about to faint. And my cardio was good. That shit is beneficial for the first 2 minutes of a fight. If you don't win before then, you lose for sure. It gives you energy (central nervous system stimulation) but your cardio suffers big time. Real bad for you.