As a side note I do something not as powerful as what is described here but it helps me focus. I combine the non-essential amino acid L-Theanine (from green te

As a side note I do something not as powerful as what is described here but it helps me focus. I combine the non-essential amino acid L-Theanine (from green tea) with caffeine to give me a more calm focused mind. Again, nowhere near as powerful as these drugs but there are also no side effects that I know of. Maybe this could be an alternative for some folks?