--- title: Does the Shingles Vaccine Prevent Dementia? What the Evidence Shows and Who Can Get the Jab Free on the NHS description: Studies link the shingles vaccine to up to 24 per cent fewer dementia diagnoses. What the evidence shows, what it cannot prove and who gets it free. author: Dr Marina Nani (Editor-in-Chief) date: 2026-11-06T14:00:00.076Z updated: 2026-11-06T14:00:00.100Z canonical: https://richhealthmagazine.com/article/does-shingles-vaccine-prevent-dementia image: https://cdn.nanimediahouse.com/unsplash-w3nqqtlk8ic.webp categories: Longevity & Science content_type: Guide publication: Rich Health Magazine schema_type: Article --- The shingles vaccine was designed to stop a painful rash. Over the past two years, studies covering hundreds of thousands of older adults in Wales, Canada and the United States have found something else: people who had the vaccine were diagnosed with dementia less often than people who did not. None of this research proves the vaccine prevents dementia. But the results line up across different countries, different vaccines and different methods, and searches for 'does the shingles vaccine prevent dementia' are rising fast in the UK. The jab is free on the NHS for millions of people, and fewer than half take it up in their first year of being eligible. ## Shingles Vaccine and Dementia Research **Wales.** Health records for more than 280,000 older adults in Wales showed that people who had the older shingles vaccine, Zostavax, were around 20 per cent less likely to be diagnosed with dementia over the following seven years. The link was stronger in women. The findings were published in Nature in April 2025. **Canada.** Researchers in Ontario compared people born just either side of the date that decided who could have the vaccine free. These two groups were alike in health and habits, apart from their access to the jab. Over five and a half years, the eligible group had 2 percentage points fewer new dementia diagnoses, a result the authors judged more consistent with cause and effect than ordinary observational studies. **United States.** A study of more than 500,000 older adults published in June 2026 looked at Shingrix, the vaccine the NHS now uses. Adults who had Shingrix after a stay in a nursing facility had a 24 per cent lower risk of a dementia diagnosis over four years. The study received funding from GSK, which makes Shingrix, though the company had no control over the design or the results. **A wider review.** A review of existing medicines that could be repurposed against Alzheimer's disease, funded by Alzheimer's Society and published in February 2026, named the shingles vaccine as the most promising candidate. Across previous studies, vaccinated people were about 16 per cent less likely to develop dementia. ## Why the Shingles Vaccine Might Protect Your Brain Shingles comes from the chickenpox virus, which stays in your nerve cells for life after childhood chickenpox and can wake up decades later. Earlier research links shingles to a higher risk of cognitive decline, including dementia. There are three main explanations under study. The first is that the virus itself, or the inflammation it causes, damages the brain over time, and the vaccine keeps it suppressed. The second is that shingles raises your risk of stroke, and stroke is one of the strongest risk factors for dementia. The third is that the vaccine gives your immune system a wider boost that reaches beyond shingles. ## What the Research Cannot Prove Yet Every study so far is observational. People who choose vaccines may also exercise more, see their GP more and look after their health in other ways, and these habits lower dementia risk on their own. The Canadian design reduces that problem, but only a randomised trial can settle it, and none has reported yet. Most of the strongest evidence comes from Zostavax, a live vaccine the UK no longer uses. The newer Shingrix data is encouraging but covers a shorter period. For now, the shingles vaccine is a proven way to prevent shingles, with a possible benefit for your brain that scientists are still testing. ## Who Can Get the Shingles Vaccine Free on the NHS In England, you can have the shingles vaccine free if you: - turned 65 on or after 1st September 2023 - are aged 70 to 79 - are aged 18 or over with a severely weakened immune system If you turned 65 before 1st September 2023, you become eligible when you turn 70. You stay eligible until your 80th birthday, and you can have your second dose up to your 81st. The programme is expanding in stages until everyone aged 60 and over is eligible by 2033. Ask your GP surgery if you think you are eligible and have not been contacted. Private clinics and pharmacies also offer Shingrix to people aged 50 and over who are not yet eligible on the NHS. ## Shingles Vaccine Uptake in England Only 42.1 per cent of people who turned 66 had received their first dose by October 2025, after a full year of eligibility. Among people turning 71, uptake was 53.5 per cent. If you, a parent or a partner fall into an eligible group, checking takes one call to the GP surgery. ## How the Shingles Vaccine Works Shingrix is given as two injections. Most people have the second dose 6 to 12 months after the first. If you have a severely weakened immune system, the gap is 8 weeks to 6 months. Shingrix is not a live vaccine and cannot give you shingles. It reduces your risk of getting shingles by more than 70 per cent. You should still have it if you have had shingles before, as shingles can come back. You can have it at the same appointment as your flu or COVID-19 vaccine, so if you are booking your [flu jab this winter](https://richhealthmagazine.com/article/flu-jab-2026-who-is-eligible-side-effects-shortages), ask for both. ## Other Ways to Lower Your Dementia Risk The Lancet Commission on dementia estimates that nearly half of dementia cases could be prevented or delayed by tackling 14 risk factors across your life, from high blood pressure and hearing loss to inactivity, smoking and loneliness. Our guide to [the 14 dementia risk factors you can change](https://richhealthmagazine.com/article/lower-dementia-risk) explains each one. Keeping your blood pressure normal, avoiding diabetes and not smoking in midlife are linked to [13 more dementia-free years](https://richhealthmagazine.com/article/midlife-risk-factors-13-dementia-free-years). ## Dementia Prevention Questions **Q: Does the shingles vaccine prevent dementia?** Studies in Wales, Canada and the United States have found that people who had the shingles vaccine were diagnosed with dementia less often, by between about 16 and 24 per cent depending on the study. These studies show a link, not proof that the vaccine prevents dementia. Randomised trials are needed to confirm it. The vaccine is proven to prevent shingles. **Q: How can you prevent dementia?** You cannot always prevent dementia, but you can lower your risk. The Lancet Commission on dementia identifies 14 risk factors you can change, including high blood pressure, hearing loss, high cholesterol, diabetes, smoking, drinking too much alcohol, physical inactivity, obesity, depression, social isolation, untreated vision loss, head injury, air pollution and less education in early life. Together they account for nearly half of dementia cases. **Q: How can you prevent dementia naturally?** Staying physically active, eating a balanced diet, keeping your weight and blood pressure in a healthy range, not smoking, drinking less alcohol, staying socially connected and keeping your mind active all lower your risk of dementia. Treating hearing loss with hearing aids and getting your eyesight checked also help. **Q: What is the best way to prevent dementia?** There is no single best way. The strongest evidence supports tackling several risk factors together, especially high blood pressure, hearing loss, inactivity, smoking and social isolation, starting in midlife or earlier. Ask your GP about an NHS Health Check if you are aged 40 to 74, as it checks your blood pressure, cholesterol and diabetes risk.