What Are Some Side Effects of L-Tyrosine?


Quick Answer

Possible side effects of L-tyrosine include nausea, fatigue, heartburn, joint pain and headache, according to WebMD. L-tyrosine is considered generally safe for oral or transdermal application in doses of up to 150 milligrams per kilogram per day for up to three months.

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Full Answer

The medical community does not have enough information on the effects of L-tyrosine on children to determine whether it is safe to use, states WebMD. Additionally, it is not known whether L-tyrosine is safe to use during pregnancy or while breast-feeding. Patients of depression, Parkinson's disease and attention deficit disorder use L-tyrosine to maintain mental alertness.

One important contraindication to the use of L-tyrosine is in conjunction with Graves disease, reports WebMD. Graves disease manifests itself through an overactive thyroid gland that uses L-tyrosine to produce thyroxine. Excess levels of L-tyrosine combined with hyperactivity of the thyroid gland can create conditions in which the body creates dangerous amounts of thyroxine, so individuals suffering from Graves disease should not take any L-tyrosine supplements.

Additionally, L-tyrosine is known to interact with levodopa, according to WebMD. L-tyrosine may reduce the effectiveness of levodopa by decreasing the amount of levodopa the body is able to absorb. As a result, medical professionals discourage the use of l-tyrosine and levodopa at the same time.

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