As for the shingles vaccine (which was entirely free to me, as it was and is to many others), even if there is only strong, but not yet sufficient evidence for the dementia aspect, where is the harm in getting it, especially since it's a two for one: shingles elimination or relief and potentially dementia reduction.

I had an interesting debate recently with a relative.

I fully support vaccination and have little concern about long-term side effects from vaccines, but I tend to be far more cautious about newer medications intended for chronic, long-term use, including GLP-1s.

But my relative holds the opposite views and couldn't understand how I could be comfortable with one but not the other.

What finally made it click for them was when I explained that a key difference is the duration of exposure.

With vaccines, the components are present in the body for a very brief period of time. So any side effects from it should show up fairly quickly. The lasting effect comes from the immune system's response and memory, not from the vaccine continually acting on the body for years.

By contrast, someone taking a long-term medication exposes their body to that medication's effects continuously for months, years, or even decades.

Because of that difference, I prefer to see extensive long-term safety data for a medication intended for long term use, whereas I don't have those concerns over a vaccine that is administered once or only occasionally.

It's not that I assume newer long-term medications are unsafe, but the risk-benefit calculation is very different when the body is being exposed to a treatment over such a long period of time.

That's why I don't see the two positions as contradictory. To me, they reflect different levels of caution based on fundamentally different patterns of exposure.