Can a shingles shot help prevent memory problems?

Getting the shingles vaccine didn’t make people go to the doctor more for other things or change how often they were diagnosed with common long-term illnesses like diabetes or high blood pressure—so if people who got the vaccine also had less dementia, it’s probably because the vaccine itself helped, not because they got better overall care.

Before people got the shingles vaccine, those just barely eligible for it were just like those just barely ineligible — same health habits, same chronic conditions — so researchers could trust that any differences later were likely due to the vaccine, not pre-existing differences.

People born right after November 2, 1936, got a free shingles shot when they turned 60, and over the next 7.5 years, fewer of them got dementia than people born just before that date—suggesting the vaccine might help protect the brain.

People who were eligible for the shingles vaccine seem to be less likely to get diagnosed with dementia later on—and this link holds up no matter how researchers tweaked their study rules, which makes it look pretty real.

In Australia, when people turned the right age to get a free shingles shot, way more of them got it than people who were just one year younger and didn’t qualify yet—so making the vaccine free at that age really worked to get more people vaccinated.