It's also important to note that of these things actually don't give you energy. The body uses fats, carbs, and protein to obtain energy (I know everyone knows this). If someone is in a horrible diet and just decides to take Acai and Magnosteen with vits and minirals they won't have that great of an effect.
Another important not is not what you take, but how you take it and how it comes (powder, liquid, solid). Something that is isotonic will work with maximal power because it is isotonic in that it works with the pressure of the rest of the liquids in your body (tears, body fluids ect) going to work as fast and efficiently as possible.
While all these things are great supplements, they aren't really any good unless you are eating right. You would just be dumping good fuel into a dirty busted car.