haha, yeah, but:

Vitamin D exposure was associated with 40% lower dementia incidence versus no exposure. Vitamin D effects were significantly greater in females versus males and in normal cognition versus mild cognitive impairment. Vitamin D effects were significantly greater in apolipoprotein E ε4 non-carriers versus carriers. Vitamin D has potential for dementia prevention, especially in the high-risk strata.

Doesn’t tell me the dosage