Five hour energy

I usually have a mid after noon lull at work where I fall asleep unless I am active, or eating a mild sized meal, or unless I am consuming copious amounts of caffeine or sugar.

I decided to try some Five hour energy to see if it works. I tried half a bottle and it worked! I took it around 3 p.m. and still had energy when I got home around 7 p.m.
I actually had enough energy to get in a work out and still felt like I had plenty of energy after a workout which completely tired out my muscles. I tried two small swallows of it the next day and it also worked for a few hours.

It has a lot of caffeine so I can not take it all the time (I may have acid reflux which is exacerbated by caffeine). It also has a lot of vitamin B so maybe the key is to find something high in vitamin B and take that.