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Tyrosine Side Effects, Interactions and Warnings

  • Excess dietary tyrosine caused depressions in all measures of performance.
    - Br Poult Sci 1982 May;23(3):239-45 -- Influence of ascorbic acid on the adverse effect of feeding a diet containing excess tyrosine to chicks. -- Yanaka M, Okumura J.

  • Possible unwanted interactions with other amino acids. Normal serotonin synthesis and release in the human brain is, among others, dependent on the availability of its precursor tryptophan (Trp) from blood. The essential amino acid Trp competes with the other large neutral amino acids (LNAA) tyrosine, phenylalanine, valine, leucine, and isoleucine for transport across the blood-brain barrier. This competition determines its uptake into the brain, represented by the ratio of the plasma level of Trp to the sum of the other LNAA.
    - Semin Clin Neuropsychiatry 2000 Apr;5(2):125-31 -- Serotonin and amino acids: partners in delirium pathophysiology? -- van der Mast RC, Fekkes D.

  • May cause stomach discomfort, changes in one's mood or headaches.
    - Psychopharm Bull 1985; 21(1):146-149. -- Amino acid precursors for the treatment of attention deficit disorder, residual type. -- Wood DR, Reimherr FW & Wender PH.

Nutrient Values
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  • Nutrition Information

  • last update: February 2014

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