Question: what are brain enhancing drugs?
Answer: Caffeine. Caffeine is the most widely consumed psychoactive substance in the world ( 1 ). ... 
L-Theanine. L-theanine is a naturally occurring amino acid found in tea, but it can also be taken as a supplement ( 7 ). ... 
Creatine. ... 
Bacopa Monnieri. ... 
Rhodiola Rosea. ... 
Panax Ginseng. ... 
Ginkgo Biloba. ... 
Nicotine.