The site advises that one tiny bottle has caffeine equivalent to two 8-ounce Red Bulls, and will provide "5-8 hours of smooth, jitter-free energy". Know what else is cool? A look at the Supplement Facts page for the energy shot shows that each serve (40ml bottle) contains 6667% of your daily required Vitamin B12, or over 2 months worth. You can currently order packs of Mana Energy Potions from the website, and a small number of retailers will be stocking them soon too.
And one last thing -- a possible indicator of how awesome your Mana replenishment process will be is the fact that the contact page lists a dedicated death threats email address.