The use of cognitive enhancers is exploding. Students, scientists, seniors, and entrepreneurs are among those using nootropics, so-called smart drugs, and brain supplements to gain a mental edge. If you want to increase your productivity, alertness, and ability to learn and remember, you should consider them too. But your brain is your most valuable asset, so you need to know all the facts before using any cognitive enhancer. While there is some overlap, all neuroenhancers can be divided into three groups based on how they are sourced and processed. In this article, we look at some of the most popular and effective cognitive enhancers in each group and tell you what you need to know to make a smart consumer decision.