Nootropics are substances pharmaceutical, herbal, or synthetic that people use with the goal of enhancing cognitive functions such as memory, attention, focus, motivation, or processing speed. The category spans a wide range, from everyday substances like caffeine and L-theanine, to dietary supplements like creatine and omega-3 fatty acids, to herbal compounds like bacopa monnieri and rhodiola rosea, to prescription medications used off-label such as modafinil or methylphenidate, to synthetic compounds like the racetam family that are sold in largely unregulated markets.