Stay away from them all... they are filled with a lot of sugar (which is considered "Energy"), herbs that might not be safe with a medicine you could be taking, and a lot of caffeine which can cause heart problems. Get a good nights sleep, exercise, and eat healthy, that is the only way to get extra energy in a safe manner. These drinks might make you feel better for a little bit, but will make you feel worse later! Trust me... I have a PhD in Nutritional Sciences...