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Nootropics are drugs, supplements, and foods that improve mental function. Sometimes people refer to them as smart drugs. They facilitate desired mental functions like memory and focus, and reduce undesired mental states like stress and depression. I've been researching and experimenting with them for years. And I've found that most don't seem to do much more than make expensive urine. But there are exceptions. Below is my list of nootropics that work, based on peer reviewed scientific research and my own experience.