Monster Energy really works. I take it whenever I drive at night to keep myself awake. The only problem is, its effect lasts more than 24 hours. At least for me.
Bear Brand Choco. Haha! I don't know why, but I drink it especially when I'm stressed or sleepy. Maybe it's the chocolate that makes me hyper.
I know it's technically not an energy booster but coffee always gives me the boost of energy I need, especially midday.