L-tyrosine is considered a nonessential amino acid found within the human body and is the precursor for the production of neurotransmitters associated with mood, attention, memory, motor skills and coordination. "Nonessential" refers to the fact that this amino acid is one of the 11 amino acids manufactured within the body.
L-tyrosine is the precursor to neurotransmitters such as dopamine, epinephrine and norepinephrine, which are often found in lower levels in individuals with depression. It is often used as a dietary supplement to promote a healthy mood and may have a positive effect on symptoms associated with depression such as irritability, fatigue and problems with attention and memory.
The only group of individuals with a medical need for L-tyrosine supplementation are those diagnosed with phenylketoneuria, a condition that can lead to a deficiency in L-tyrosine.
What to Look for
L-tyrosine is most often used for mood-related problems and as an exercise supplement. This amino acid can be purchased as a dietary supplement or ingested through protein-rich foods such as meats, seafood, beans, seeds and dairy products. Other foods rich in L-tyrosine include oatmeal, bananas and avocados.
L-tyrosine is more effective when combined with vitamin B-6, folic acid and copper, which all help convert this amino acid into the end product, norepinephrine. It can also be taken in combination for mood support with L-tryptophan, another nonessential amino acid that is critical in maintaining a healthy mood and sleep. L-tryptophan is converted to serotonin, a neurotransmitter also found in lower levels in depressed individuals, and is found in foods such as turkey, cottage cheese and soy products.
Common Pitfalls
Individuals diagnosed with diseases associated with neurotransmitters such as Parkinson's disease or schizophrenia should avoid taking L-tyrosine unless advised to do so by their physicians.
As with most natural alternatives, too little research has been done to know the effective doses recommended for mood support. Users may take an amount that is ineffective and erroneously conclude that the product does not work.
Individuals who wish to target fatigue and lethargy should avoid taking a combination of L-tyrosine and L-tryptophan. These two amino acids compete for the same brain receptors, and the combination may cancel out the energizing effect of L-tyrosine.
All users should consult with their physicians or mental health professionals before using any natural alternative, since most natural alternatives act as a drug within the body and have the potential to interact with prescription medications.
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