L-
tyrosine (also known just as tyrosine) is a nonessential amino acid. This means that it does not need to be obtained from dietary sources; the human body can make L-tyrosine using
phenylalanine, another amino acid. L-tyrosine is also used in
dietary supplements and is claimed to be useful for a variety of different conditions, such as:
- Depression
- Premenstrual syndrome (PMS)
- Attention deficit hyperactivity disorder (ADHD).
How Does L-Tyrosine Work?
As mentioned, L-tyrosine is an amino acid that is important for building proteins. For most people, the body can make its own L-tyrosine, although it is also found in protein-rich foods. People with phenylketonuria (PKU) must obtain L-tyrosine through the diet, since they cannot produce it. Even though it is a large amino acid, L-tyrosine can cross the blood-brain barrier to enter the brain, and may have numerous different effects in the brain. It is not known how L-tyrosine may work for a variety of different disorders.
L-tyrosine (as part of a specially designed protein supplement) is effective for people with phenylketonuria, although further supplementation in addition to the protein supplement is usually not recommended. It is not known if L-tyrosine is effective for other uses.
Dosing Information for L-Tyrosine
A safe and effective L-
tyrosine dose has not yet been established. Be sure to follow the specific instructions on your particular L-tyrosine product.
Side Effects of L-Tyrosine
Although it is a "natural" product, L-tyrosine can still cause side effects. Some of the more commonly reported side effects include:
(Click L-Tyrosine Side Effects to learn more, including potentially serious side effects that you should report immediately to your healthcare provider.)
Drug Interactions With L-Tyrosine
Some people may be more likely than others to experience problems with L-tyrosine. Therefore, you should talk with your healthcare provider before taking it if you have:
- Hyperthyroidism (an overactive thyroid)
- Graves' disease
- Phenylketonuria (PKU)
- Any allergies, including allergies to food, dyes, or preservatives.
Also, let your healthcare provider know if you are:
Make sure to tell your healthcare provider about all the medicines you take, including prescription and non-prescription medicines, vitamins, and herbal supplements.
(Click L-Tyrosine Safety for more information, including any available warnings and precautions with L-tyrosine.)
What If I Take an Overdose of L-Tyrosine?
It is not known what exactly to expect from an L-
tyrosine overdose. If you think you may have taken too much, seek immediate medical attention.
How Should L-Tyrosine Be Stored?
Refer to the label of your individual L-tyrosine product for information on how best to store it. Keep L-tyrosine and all other medications and supplements out of the reach of children.