The effects of tyrosine on cognitive performance during extended wakefulness.

Neri DF1, Wiegmann D, Stanny RR, Shappell SA, McCardie A, McKay DL.

Naval Aerospace Medical Research Laboratory, Pensacola, FL, USA.

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"...oral tyrosine given in the middle of the testing period resulted in improved performance (smaller performance decline) during the sleep deprivation period. Better performance was observed on tracking tasks and running memory tasks, and subjects also reported reductions in sleepiness and fatigue intensity. No side effects were noted in those taking tyrosine..."

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