Are you going to take the vaccine?

[Minyatur]

"Thoughts become things"

"The body is a creature of the minds creation"

So anything one truely believes will be true. If one thinks they will suffer irreparable damage from a vaccine. Then they may. The opposite is also true.

The mind/body remains a creature of this density, so there is a limit to what your beliefs can do. It'd think it is more along the lines of enhancing natural features of the mind/body, like your immune system's response for example. This shaping process from mind to body is probably in part lengthy also, which shapes evolution.

If you go ahead and drink a liter of bleach, I doubt the beliefs of your mind can turn it into something useful for the body. I'm not saying that the vaccine contains anything harmful, as I honestly have no idea about that. But if it does, I don't think it is true to say that beliefs can turn it into something useful whatever it contains.