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What is N-acetyl L-tyrosine and does it matter with thyroid medicine?
N-acetyl L-tyrosine is a modified form of the amino acid tyrosine. Sources warn that tyrosine may interact with MAO inhibitors and thyroid medicine. On the Reviralis Complete label it is the 7th of 18 names in a 661 mg blend, so it holds at most 94.4 mg per serving of two capsules. The real amount is not printed.
Written by the Goreviralis label deskUpdated · 4 min read
The ingredient01
What is N-acetyl L-tyrosine?
It is tyrosine with an acetyl group attached. Tyrosine itself is an amino acid in protein foods that the body uses to build messenger chemicals and thyroid hormone.
Supplement makers sell the acetyl version as easier to dissolve. We found no source that shows it is absorbed better in people, so treat that as a sales claim. The research we read looks at plain L-tyrosine, not the acetyl form.
That research says tyrosine helps thinking only under short-term stress or demand, and only when messenger function is intact (Jongkees 2015, Tyrosine Supplementation Review (J Psychiatr Res)). It is a narrow finding, not a general promise.
Medicines02
Does tyrosine interact with thyroid or MAO inhibitor medicine?
We found no source that names an interaction, so we cannot say. The tyrosine review we read does not cover interactions (Jongkees 2015, Tyrosine Supplementation Review (J Psychiatr Res)), and the label tells antidepressant and prescription users to ask first.
MAO inhibitors are a class of antidepressant. Thyroid medicine, such as levothyroxine, is taken for an underactive thyroid. The Reviralis label already names antidepressants and medicine affecting the nervous or cardiovascular system in its caution. Tyrosine is one more reason to show a pharmacist the label.
| If you take | Why to ask |
|---|---|
| An MAO inhibitor antidepressant | No source found naming an interaction; the label says ask first |
| Thyroid medicine | No source found naming an interaction; ask about timing |
| Any prescription medicine | The label says consult your provider first |
| A prescribed antiviral | Keep taking it; ask if anything in the blend matters |
On timing, we have no source that sets a gap in hours, so we give none. Ask the pharmacist who fills your thyroid prescription how to space it from any new supplement.
The arithmetic03
How much N-acetyl L-tyrosine can Reviralis hold?
At most 94.4 mg per serving. It sits 7th of 18 names in the blend, and the seventh cannot outweigh the six before it.
US rules list blend members from most to least by weight (21 CFR 101.36). Seven names share the top of a 661 mg total, so the seventh is at most 661 divided by 7, which is 94.43 mg. That is a ceiling from list order. The real amount is not printed, and it could be much smaller.
The sales page for Reviralis talks about outbreaks and flare-ups. The label never mentions herpes, and we found no source tying tyrosine to herpes. Herpes simplex virus has no cure. Prescription antivirals such as acyclovir, valacyclovir and famciclovir are the proven care (CDC, STI Treatment Guidelines: Herpes).
Reviralis: from $49 a bottle60 capsules a bottle · 2, 3 or 6 bottles · free US shipping on 3 and 6 · 60-day money-back guarantee
See packsBefore you buy04
What should you do before adding it to your routine?
Make a one-page medicine list, label in hand, and bring it to a pharmacist.
List every medicine
Include thyroid pills, antidepressants and anything over the counter.
Read the caution
Ask first if pregnant or nursing, if you have a medical condition or seizure history, or if you take prescription medicine. Not for anyone under 18.
Keep your care plan
Keep taking prescribed medicine, including any antiviral. See a clinician for a diagnosis, since other conditions look like herpes.
Know the emergency signs
Call 911 for trouble breathing, a seizure, chest pain, swelling of the face or throat, or sudden confusion with a severe headache and stiff neck.
The medicine check page has the longer list, and the ingredients page shows where tyrosine sits among all 40 names. Next in the label order: the post on green tea extract. Packs are on the pricing page.
FAQ05
Reviralis questions people ask
What is the difference between L-tyrosine and N-acetyl L-tyrosine?
N-acetyl L-tyrosine is L-tyrosine with an acetyl group added, which makers say helps it dissolve. We found no source showing better absorption in people. The research we read concerns plain L-tyrosine.
Does tyrosine interact with thyroid medicine?
It may, according to Memorial Sloan Kettering. We found no source giving a safe gap in hours, so ask the pharmacist who fills your thyroid prescription how to space any new supplement. Do not change a prescribed dose on your own.
How much N-acetyl L-tyrosine is in Reviralis?
The label does not print it. It is 7th of 18 names in a 661 mg blend, so it holds at most 94.4 mg per two-capsule serving. The real figure could be far lower, and no lab report is published.
Can tyrosine be taken with antidepressants?
Tyrosine may interact with MAO inhibitors, so tell your prescriber and pharmacist before any tyrosine product. The Reviralis label also asks people taking antidepressants to consult a provider before use. Do not stop a prescribed antidepressant on your own.
Who wrote this06
Written and reviewed by
Pages built from the label, the sales page and linked NIH, CDC, FDA, FTC, Mayo Clinic and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is the information site for a U.S. stocking partner for Reviralis. It is not the manufacturer or the distributor named on the label. We earn money when you buy through our order links.
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