Vitamin D Linked to 13% Higher Cognitive Scores in Study
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- Emory University researchers found that adults with mild cognitive impairment and sleep disturbances who took at least 5,000 IU of vitamin D daily scored more than 13% higher on the Montreal Cognitive Assessment (MoCA) than those taking none, after adjusting for other factors.
- The study, published in Sleep Medicine, enrolled 54 participants with both MCI and sleep problems, and was the first to examine vitamin D intake specifically in this high-risk population.
- Lower daily doses of vitamin D showed no association with improved cognitive scores — only the 5,000 IU-or-more group saw the measurable benefit on the MoCA test.
- Senior author Victoria Pak, associate professor at Emory's Nell Hodgson Woodruff School of Nursing, called MCI a potential "critical window for intervention" when cognitive changes are emerging but brain-health opportunities may still exist.
- Both vitamin D2 (plant or fungi-derived) and vitamin D3 (produced via sun exposure or animal-based foods) were linked to similar cognitive performance gains, indicating the form of supplementation did not appear to matter.
- The research was funded by the National Institute on Aging through NIH grants R01AG097853-01 and R61AG080606, with co-authors including Sirui Zhou, Paul Sudeshna, Lynn Marie Trotti, and Donald Bliwise.
Why it matters: With more than 7 million Americans currently living with Alzheimer's dementia and projections nearing 13 million by 2050, identifying low-cost, modifiable factors during the MCI stage — before full dementia sets in — carries significant public-health stakes. The 5,000 IU threshold finding points to a specific, testable intervention for a high-risk subgroup, not a blanket recommendation for the general population.
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