University of Calgary researchers to look at aging brain as study provides association but not causal link between vitamin D intake and prevention of dementia. Observational nature of study did not have the power to account for confounding variables.

Medical Mythbusting Commentary for March 2, 2023

Source:
University of Calgary researchers to look at aging brain as study says vitamin D prevents dementia

Reference:
Vitamin D supplementation and incident dementia: Effects of sex, APOE, and baseline cognitive status