Vitamin or Mineral Supplements Don’t Prevent Dementia (only one Vitamin D trial, it used 400 IU)
Vitamin or Mineral Supplements Don’t Prevent Dementia New York Times
Reporting on
Cochrane Database of Systematic Reviews: Vitamin and mineral supplementation for maintaining cognitive function in cognitively healthy people in mid and late life Dec 2018
VitaminDWiki rented the PDF, which describes the single Vitamin D trial considerd

Items in both categories Seniors and Cognitive are listed here:
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Items of Cognition and Meta-analysis
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Overview Alzheimer's-Cognition and Vitamin D starts with
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Cognitive category starts with the following
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The study did not consider the benefits of Omega-3
(Omega-3 is not a vitamin nor a mineral)
Items in BOTH the categories Cognition and Omega-3
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