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March 23, 2018  |  Login
By James F. Balch, M.D. and Mark Stengler, N.D.
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Description: This amino acid is derived from another amino acid known as phenylalanine. L-tyrosine is a precursor for the formation of the neurotransmitters L-dopa dopamine, norepinephrine, and epinephrine. The skin also converts tyrosine into melanin, the pigment that protects the skin against harmful UV radiation. In addition, this amino acid is required for the synthesis of thyroid hormone.


  • Depression
  • Hypothyroidism
  • Parkinson's disease
  • Phenylketonuria

Precautions: People with liver or kidney disease should not supplement amino acids unless under the direction of a health-care professional.

Dosage: Take 250 to 500 mg twice daily between meals.

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