In Alzheimer mice models, which are completely flawed to begin with. Another pure junk headline.

They also did a retrospective population-based cohort study (no intervention), which is not enough to prove any kind of causality and is prone to confounding factors that can't be easily controlled for (how much time people spend in the sun every day will have a huge impact in their Vitamin D levels and their needs for supplementation or not).

Or it might improve the condition: https://pubmed.ncbi.nlm.nih.gov/29447107/

Vitamin D status and risk of dementia and Alzheimer's disease: A meta-analysis of dose-response

Science is hard, and effect sizes matter.

I'm 76. Have declining cognitive function. Have been taking D3 for over a decade. Damn! I don't know what to do other than to experiment with not taking D3.

I can't possibly believe any Alzheimer's research right now.

https://www.dailykos.com/stories/2022/7/22/2111914/-Two-deca...

https://www.science.org/content/article/potential-fabricatio...

New territory. Needs really deep research.