THIS PRODUCT IS JUST LIKE ....,BUT IT IS MORE EFFECTIVE,IT MAKES YOU FEEL THAT YOU HAVE TRAINED FOR HOURS,WHILE YOUR MUSCLES FEEL FEED AND CAN FEEL LIKE YOU HAVE MORE STAMINA TO GO ANOTHER 6-8HRS MORE.I HAVE NEVER HAD ANOTHER PRODUCT DO THAT.THATS WHAT GREAT ABOUT IT.THE NOT SO GREAT ABOUT IT..NONE,IT IS GOOD!!!