Nootropic

Any agent [that] improves mental function, including attention, cognition, concentration, memory or motivation, ... by increasing the availability of neurotransmitters, enzymes, hormones, ... O2 delivery, or stimulating neural activity [Segen2012]; Capable of improving or preserving memory, of potentiating learning, or of preventing cognitive decline or dementia [Farlex2009].

•  ∧   
  Nervous System
•  ∨   
  Nootropic, Memory
•  ∨   
  Nootropic, Stamina

•  >   
  Ashwagandha (Withania somnifera)
•  >   
  Astragalus (Astragalus membranaceus)
•  >   
  Coffee (Coffea arabica)
•  >   
  Gotu Kola (Centella asiatica)
•  >   
  Kava (Piper methysticum)
•  >   
  Tea (Camellia sinensis)
•  >   
  Turmeric (Curcuma longa)

[Farlex2009] Medical Dictionary, © 2009 Farlex and Partners Retrieved June 5 2016 from http://medical-dictionary.thefreedictionary.com/nootropic.

[Segen2012] Segen's Medical Dictionary. © 2012 Farlex Retrieved June 5 2016 from http://medical-dictionary.thefreedictionary.com/nootropic.