A recent Emory University study found that adults with mild cognitive impairment and sleep disturbances who took 5,000 IU or more of vitamin D daily scored significantly higher on cognitive tests compared to those who didn't supplement with vitamin D.
- 5,000 IU+ vitamin D linked to better cognition in seniors
- Study focused on adults with mild cognitive impairment and sleep problems
- Both vitamin D2 and D3 forms showed similar benefits
What happened
Researchers at Emory University studied 54 older adults experiencing both mild cognitive impairment (MCI) and sleep disturbances — conditions often associated with early dementia. Participants taking at least 5,000 IU of vitamin D daily scored over 13% higher on the Montreal Cognitive Assessment (MoCA), which evaluates memory and thinking skills. This finding remained consistent even after adjusting for other influencing factors.
The study compared the effects of different types of vitamin D supplements, finding that vitamin D2 (plant-based) and vitamin D3 (sun and animal-based) both correlated with improved cognitive performance. Those taking lower doses of vitamin D did not show significant cognitive benefits, highlighting the importance of sufficient supplement levels.
Why it feels good
This research offers hope for people facing early cognitive challenges by suggesting a simple, modifiable, and accessible way to potentially support brain health. Since sleep disturbances and MCI can be early indicators of dementia, the study indicates there might be a valuable window for intervention to help maintain cognitive function.
Vitamin D is a crucial nutrient tied to nerve and muscle function as well as sleep quality. Considering sleep disturbances are common among Alzheimer’s patients, the discovery of a link between vitamin D supplementation and improved cognition aligns with efforts to find holistic approaches to delay or lessen cognitive decline.
What to enjoy or watch next
This preliminary finding opens the door for more extensive studies on vitamin D and cognitive health, especially among at-risk older adults. Those interested in brain health may want to follow future research on dosing, timing, and long-term effects of vitamin D supplementation.
Meanwhile, maintaining overall wellness through balanced nutrition, good sleep hygiene, and regular exercise remains key. Keep an eye out for new developments from Emory and other research institutions investigating safe, effective ways to support brain function as cognitive decline remains a growing global concern.