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Tyrosine

Tyrosine, taken during exposure to stress, improves mood, decreases stress-related complaints and enhances mental performance. Banderet LE and Lieberman HR. Treatment with Tyrosine, a Neurotransmitter Precursor, Reduces Environmental Stress in Humans. Brain Res Bull 1989;22(4):759-62.

According to very preliminary evidence, tyrosine supplements may help fight fatigue and improve memory and mental function in people who are deprived of sleep or exposed to other forms of stress. Neri DF, Wiegmann D, Stanny RR, et al. The effects of tyrosine on cognitive performance during extended wakefulness. Avit Space Environ Med. 1995;66:313–319.

Preliminary findings indicate a beneficial effect of tyrosine, along with other amino acids, in people affected by dementia, including Alzheimer’s disease. Meyer JS, Welch KMA, Deshmuckh VD, et al. Neurotransmitter precursor amino acids in the treatment of multi-infarct dementia and Alzheimer’s disease. J Am Geriatr Soc 1977;7:289–98.

Due to its role as a precursor to norepinephrine and epinephrine (two of the body’s main stress-related hormones) tyrosine may also ease the adverse effects of environmental, psychosocial, and physical stress. Neri DF, Wiegmann D, Stanny RR, et al. The effects of tyrosine on cognitive performance during extended wakefulness. Aviat Space Environ Med 1995;66:313–9. Deijen JB, Wientjes CJ, Vullinghs HF, et al. Tyrosine improves cognitive performance and reduces blood pressure in cadets after one week of a combat training course. Brain Res Bull 1999;48:203–9. . Shurtleff D, Thomas JR, Schrot J, et al. Tyrosine reverses a cold-induced working memory deficit in humans. Pharmacol Biochem Behav 1994;47:935–41. Deijen JB, Orlebeke JF. Effect of tyrosine on cognitive function and blood pressure under stress. Brain Res Bull 1994;33:319–23.

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