Another energy drink question. Why don't energy drinks work on me?!

Another energy drink question. Why don't energy drinks work on me?

They honestly don't work. I know several people that have the same "problem". I only drink them because they taste good, and no normal pop (soda for you non-michiganders) tastes the same. Anyone know the reason?

3 days ago
Well I just love how you guys assume. I'm in shape, but it has nothing to do with me "training harder". And it's not about me overdosing, either. I drank one all day. You guys should stop assuming or you'll get killed some day.

Alex, you should try XS Energy Drink. The reason most energy drinks don't work is that they rely on plenty of sugar and caffeine. And, to be quite honest, if you read the medical data on caffeine, it's actually good for you in moderation. It's just that many manufacturers overdo it. XS tastes like soda pop, has no sugar (uses the same ingredient as Splenda to sweeten) and derives most of its energy from 4900% Vitamin B12. Your body safely metabolizes any B12 it can't use. It comes in 12 flavors/varieties and is comparable to Red Bull in price.
I hope you find just the right solution for your body!