Nootropics (/noʊ.əˈtroʊpɪks/ noh-ə-TROHP-iks or /noʊ.əˈtrɒpɪks/ noh-ə-TROP-iks;[1] but not /njuːˈtroʊpɪks/ new-TROHP-iks or /njuːˈtrɒpɪks/ new-TROP-iks,[1] which are common mispronunciations), colloquially brain supplements, smart drugs and cognitive enhancers, are natural, semisynthetic or synthetic compounds which purportedly improve cognitive functions, such as executive functions, attention or
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