Link: https://www.sciencealert.com/common-vitamin-may-reduce-buildup-of-alzheimers-proteins-study-finds

the study: https://www.neurology.org/doi/10.1212/WN9.0000000000000057

New research has linked levels of vitamin D in midlife with toxic tangles of tau protein that accumulate in the brains of those with Alzheimer's disease.

Don't over do it.

Yeah, & I discovered that some people have a gene for .. conserving vitamin-D, or something like that, so that dosages insufficient for normal people are entirely sufficient for them.

damn biochemistry gets complicated, when you try understanding all the different things properly..

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To add more context that (if i'm understanding
the study correctly), higher levels of vitamin D in midlife lowers dementia risks.

"In a group of dementia-free individuals, higher serum 25(OH)D at early midlife was associated with lower tau deposition on brain-PET a mean of 16 years later. Low vitamin D in midlife may represent a potentially modifiable target to mitigate the risk of neuroimaging signs of preclinical dementia."