A member asked:

Are there any interactions or concerns regarding taking the amino acid l-tyrosine and the thyroid med synthroid? drug interdiction sites dont have much on the two together as one is a drug and the other i guess isnt. mixed chatter on the subject.

2 doctors weighed in across 2 answers
Dr. Stuart Hickerson answered

Specializes in Family Medicine

This amino acid is one of the basic amino acids your thyroid uses to make thyroid hormone. If you are taking synthroid this can lead to excess thyroid in the serum and signs of hyperthyroidism. Some times a provider will do this to improve response to thyroid replacement, but should probably not be done unless your provider thinks this is appropriate.

Answered Feb 25, 2020

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Dr. John Berryman answered

Specializes in Obstetrics and Gynecology

Tyrosine and Synthroid do not interact in an adverse way. Check with your physician who prescribed the Synthroid, as he/she may know other medical history which would influence taking both.

Answered Feb 25, 2020

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