<p>Effects of some legal alternatives to Adderall for help with concentration</p>
<p>Human Psychopharmacology: Clinical and Experimental
Volume 14, Issue 6 , Pages 415 - 427
Published Online: 18 Aug 1999
The effects of ephedrine on the development of fatigue in a prolonged driving-related task</p>
<p>A taurine and caffeine-containing drink stimulates cognitive performance and well-being
Amino Acids
Issue Volume 19, Numbers 3-4 / November, 2000</p>
<p>Hum Psychopharmacol. 2007 Aug;22(6):339-50.
Effects of repeated doses of caffeine on performance and alertness: new data and secondary analyses.</p>