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Lysine for Cold Sores: Why Reviews Find No Evidence
Lysine for cold sores is not shown to work. A Cochrane review found no evidence of efficacy for preventing them. Another review found doses under 1 g a day ineffective and doses above 3 g a day only improved how people felt. Reviralis Complete lists no lysine, so these results do not apply to it.
Written by the Reviralis label deskUpdated · 4 min read
The idea01
Does lysine prevent cold sores?
No. A Cochrane review of interventions for preventing cold sores reported no evidence of efficacy for lysine (Chi 2015, Cochrane: Preventing Cold Sores).
Lysine is an amino acid, sold as a supplement and widely suggested online for cold sores. The idea is popular. The proof is missing. Cochrane reviews follow a fixed method, and when they say no evidence of efficacy, the trials gathered did not show a benefit.
That does not prove lysine is useless in every case. It means that, today, there is no good basis to promise it.
Doses02
What doses of lysine have been studied?
A review of lysine trials found doses under 1 g a day ineffective and doses above 3 g a day only improved subjective experience (Mailoo and Rampes 2017, Lysine Review (Integr Med)).
Subjective means how people felt, not a count of sores. So even at higher doses, the review did not report fewer outbreaks as a clear result.
| Question | Finding | Source |
|---|---|---|
| Does it prevent cold sores? | No evidence of efficacy | Cochrane review |
| Under 1 g a day | Ineffective | Lysine review |
| Over 3 g a day | Only subjective improvement | Lysine review |
| Any cure for herpes | None exists | CDC |
The CDC states that herpes has no cure (CDC, About Genital Herpes). No lysine dose changes that.
On the label03
Is there lysine in Reviralis?
No. The Reviralis label lists no lysine, in the vitamin and mineral lines or in the 661 mg blend.
The 40 names on the label are 22 vitamin and mineral lines plus 18 blend names, from DMAE bitartrate to phosphatidylserine. You can count them in the ingredient list. Lysine is not among them.
So the lysine results neither support nor weaken the product. We discuss lysine only because readers ask about it. The honest reading is that the label's blend has no lysine, and no source shows any of its listed names prevents outbreaks.
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 packsBuying a supplement04
How should you judge any supplement sold for cold sores?
Ask three things: what was tested, at what dose, and what the result measured.
- Was it tested in people, or only in a lab?
- Did the trial use the same dose as the product gives?
- Did it count outbreaks, or only how people felt?
FDA says a supplement sold to treat or prevent a named disease is a drug (FDA, Questions and Answers on Dietary Supplements). FDA and FTC have acted against products sold for sexually transmitted infections, and say no over-the-counter supplement can treat or prevent them (HIV.gov, FDA and FTC Act on Fraudulent HIV and STD Products). If a page leaves out the test, the dose and the result, treat the claim as marketing.
Our direct answer on supplements and outbreaks pulls the sources together.
Proven care05
What is the proven care for repeat cold sores?
Prescription antivirals are the proven care, and a clinician decides who needs them.
The CDC says they shorten outbreaks, and daily suppression lowers recurrences and partner transmission (CDC, About Genital Herpes). Keep prescribed medicine exactly as directed. Do not stop an antiviral to try lysine or any capsule.
Reviralis is not an antiviral, and no source shows it prevents or reduces outbreaks. See a clinician for a weak immune system, a sore lasting over two weeks, frequent repeats, or any eye symptom.
FAQ06
Reviralis questions people ask
Is lysine safe to take for cold sores?
We did not gather a safety source for lysine, so we cannot give a verdict. Ask a pharmacist or clinician, especially if you take other medicines, have kidney problems, or are pregnant or nursing.
How much lysine did the studies use?
A review reported that doses under 1 g a day were ineffective, and doses above 3 g a day only improved how people felt. That is what we can say. We give no dose advice.
Can lysine clear the virus?
No. The CDC and WHO both say herpes has no cure. Lysine has not been shown to prevent cold sores either, so it should not replace a prescribed antiviral or a clinician's plan.
Why do some people say lysine worked for them?
Cold sores come and go on their own, so a good stretch can look like a result. Personal stories are not trials. Cochrane found no evidence of efficacy for preventing cold sores.
Does Reviralis Complete contain lysine?
No. Its 40 label names are 22 vitamin and mineral lines and an 18-name blend, and lysine is not among them. Reviralis is not an antiviral, and no source shows it prevents outbreaks.
Who wrote this07
Written and reviewed by
Pages built from the label, the order page and linked NIH, 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 USA Authorized Reviralis Retailer. 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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