First of all, if it exist, and proven to be working, why not? 10% of our brain use because we haven't evolve to a certain being that can use more than 10%, if taking this pill might increased our brain capacity which enable us to use.
For example: if we could travel across the sea without touching it. If it exist? do we want to try? people might think that the person who think it exist in the older days might be crazy. and yet, there's invention of the plane by the wright's brothers.
My beliefs is that God will unfold the knowledge to us and enable us to achieve certain knowledge. If we're not ready for it, we can't even obtain it. Also looking at the subconcious mind, as to placebo effect. Most of our brain thinking that it's true we're taking the pills does work it effects.