It's important to mention the difference between natural nootropics and pharmaceutical products, usually created to combat specific brain diseases. L-Tryptophane, 5-HTP, Bacopa or Centella asiatica can be considered as safe (as long as they are not overdosed), unlike Concerta, Ritaline, or L-Dopa (which also are referred to as "brain pills" sometimes). A great source of information that I personally use and love to recommend is http://examine.com - this platform provides you with scientific research on various effects of nootropics and supplements.