As an enhanced version of Vitamin B1, Sulbutiamine offers a number of very real and impactful benefits for your cognitive function. Sold under the name Arcalion, this synthetic derivative of thiamine has positive effects for memory, depression, shyness, fatigue and even erectile disfunction.
http://www.unitedpharmacies.com/Arcalion-Sulbutiamine.html Do not exceed 600 mg in 24 hours.
Treatment of chronic postinfectious fatigue: randomized double-blind study of two doses of sulbutiamine (400-600 mg/day) versus placebo
Rev Med Interne. 1999 Oct;20(10):912-8.