The amino acid L-tyrosine can be converted into norepinephrine, a neurotransmitter that affects mood. Women taking oral contraceptives have lower levels of tyrosine, and some researchers think this might be related to depression caused by birth control pills.

Does L-tyrosine interact with any medications?

What other drugs will affect L-Tyrosine? Do not take L-Tyrosine without medical advice if you are using any of the following medications: levodopa; or. thyroid replacement (Synthroid, Levothroid, and others).

When should you not take L-tyrosine?

Since tyrosine is involved in the production of thyroid hormones, you should not use L-tyrosine if you have a thyroid condition such as hyperthyroidism or Graves disease. It could cause your levels to go too high. Some tyrosine is converted into the neurotransmitter epinephrine.