Can a Shingles Vaccine Protect Your Heart?
An observational study of more than a million people in South Korea found that those vaccinated against herpes zoster were 26% less likely to die from heart disease or to have a stroke, heart attack, or heart failure than people who had not been vaccinated. The protective effect of the live zoster vaccine lasted for up to eight years, with the largest reduction in the first two to three years after vaccination.
These findings were published in the European Heart Journal and reported in The BMJ in 2025. This was an observational study, not a randomized trial, so it shows an association rather than proof of cause. Even so, it adds to the evidence that the shingles vaccine may do more than prevent a painful rash.
What the Data Show
Researchers followed over a million people in South Korea and compared those who received the live zoster vaccine with those who did not. The outcome they tracked was a combination of death from heart disease, stroke, heart attack, and heart failure.
Vaccinated people had a 26% lower risk of that combined outcome. The benefit persisted for up to eight years, and it was strongest in the first two to three years after vaccination. The reduction in cardiovascular disease risk was more pronounced among men, among people under 60, and among those with unhealthy lifestyle habits such as smoking, drinking alcohol, and being inactive.
Dr. Kumar’s Take
I find this study interesting for two reasons. The first is the size: over a million people is a lot of signal to work with. The second is the pattern of the result. The effect was largest in the first two to three years after vaccination and then faded across the eight years of follow-up, which is the shape you would expect if the vaccine itself were doing something, rather than the shape you would expect from a fixed difference between the kinds of people who seek vaccination and the kinds who do not.
That said, this is observational. People who choose to get vaccinated often take better care of their health in other ways, and no amount of statistical adjustment fully removes that problem. I would also note that the benefit was larger in people with unhealthy lifestyle habits, which cuts against the simplest version of the healthy-volunteer objection. I am not going to tell you the vaccine protects your heart. I will say that if you were already on the fence about a vaccine that prevents a genuinely miserable illness, this is a reason to stop being on the fence.
How the Shingles Vaccine May Protect the Heart
The herpes zoster virus is the same virus that causes chickenpox. After the initial infection it stays dormant in nerve tissue and can reactivate later in life as shingles. A vaccine that prevents reactivation prevents the inflammatory illness that follows it.
That is the most plausible route from a shingles vaccine to a cardiovascular effect, and the timing in this study fits it: the risk reduction was concentrated in the first two to three years after vaccination and diminished over the following years. This study measured outcomes, not mechanism, so the biological pathway remains a hypothesis.
Who Should Consider the Shingles Vaccine?
This study suggests the cardiovascular association was more pronounced among men, among people under 60, and among people with unhealthy lifestyle habits including smoking, drinking, and inactivity. If you are in one of those groups, the case for following through on vaccination is a little stronger than it was before.
Study Limitations
This was an observational study, meaning researchers did not randomly assign anyone to be vaccinated. People who get vaccinated may live healthier lives in ways the analysis cannot fully capture. The study was conducted in South Korea, so how well the result transfers to other populations and other health systems is an open question. It examined the live zoster vaccine specifically. The size of the study, over a million people, gives the estimate precision, but precision is not the same thing as freedom from bias.
Practical Takeaways
- Ask your doctor whether you are due for shingles vaccination. The primary reason is still shingles itself, a painful illness that this vaccine prevents.
- The cardiovascular association in this study was strongest in men, in people under 60, and in people who smoke, drink, or are inactive.
- The observed benefit lasted up to eight years and was largest in the first two to three years, so timing matters less than simply getting it done.
Related Studies and Research
If you found this article helpful, you may also want to explore these related topics on cardiovascular health:
- Can meditation help prevent heart attacks and strokes?
- Ultra-processed foods linked to 47% higher heart disease risk
- Irregular sleep patterns increase heart disease risk by 2x in large study
- Does rosuvastatin prevent heart disease in healthy people with intermediate risk? A look at the HOPE-3 trial
FAQs
Is the shingles vaccine specifically approved for heart protection?
No. The shingles vaccine is approved to prevent herpes zoster and its complications. The cardiovascular finding here is an observed association in an observational study, not an approved indication and not proof of cause. Randomized trial evidence would be needed before anyone could make a cardiovascular claim for the vaccine.
Can the shingles vaccine help if I have already had a heart attack?
This study tracked a combined outcome that included heart attack, stroke, heart failure, and death from heart disease, and vaccinated people had a 26% lower risk of that outcome. The reduction was more pronounced among men, among people under 60, and among people with unhealthy lifestyle habits. If you have established heart disease, bring this to your cardiologist and decide together, since your vaccination plan should sit inside your overall prevention plan rather than beside it.
How long do the heart benefits of the shingles vaccine last?
In this study, the protective effect of the live zoster vaccine lasted for up to eight years. The greatest reduction in risk appeared in the first two to three years after vaccination, and the effect diminished over the years that followed. Whether any benefit persists beyond eight years is not something this study can answer.
Bottom Line
An observational study of over a million people in South Korea found that people vaccinated against herpes zoster were 26% less likely to die from heart disease or to have a stroke, heart attack, or heart failure. The effect lasted up to eight years, was largest in the first two to three years, and was more pronounced in men, in people under 60, and in people with unhealthy lifestyle habits. This is association, not proof. But the shingles vaccine was already worth getting for shingles alone, and this makes the decision easier rather than harder.
