Tyrosine is an amino acid found in meat proteins. Your body uses it as a starting material to make several neurotransmitters (chemicals that help the brain and nervous system function). Based on this fact, tyrosine has been proposed as a treatment for various conditions in which mental function is impaired or slowed down, such as fatigue and depression. It has also been tried for attention deficit disorder (ADD).
Your body makes tyrosine from another common amino acid, phenylalanine , so deficiencies are rare; however, they can occur in certain forms of severe kidney disease as well as in phenylketonuria (PKU), a metabolic disorder that requires complete avoidance of phenylalanine.
Good sources of tyrosine include dairy products, meats, fish, and beans.
The typical therapeutic dosage of tyrosine used in studies ranges from 7 g to 30 g daily.
Based on the findings, mentioned in the above paragraph, it has been inferred that tyrosine might enhance alertness in people suffering from jet lag , but this has not been studied directly.
What Is the Scientific Evidence for Tyrosine?
Tyrosine seems to be generally safe, though at high dosages some people have reported nausea, diarrhea, vomiting, or nervousness. As with any other supplement taken in multigram doses, it is important to use a high-quality product; even a very small percentage of contaminant in the product might add up to a dangerous amount.
Maximum safe dosages for young children, women who are pregnant or nursing, or those with severe liver or kidney disease have not been established.
- Reviewer: EBSCO CAM Review Board
- Review Date: 08/2013 -
- Update Date: 08/22/2013 -