Study Suggests High-Dose Vitamin D May Boost Brain Function in Dementia-Risk Patients

Research from Emory University examined 54 older adults with mild cognitive impairment and sleep disturbances, finding that those taking 5,000 international units or more of vitamin D daily performed better on cognitive assessments. The study highlights vitamin D's potential role in supporting brain health during early stages of cognitive decline, when interventions may still be effective in slowing progression toward Alzheimer's disease. The form of vitamin D—whether plant-derived or animal-based—did not affect the cognitive benefits observed.

Vitamin D serves multiple functions in the body beyond bone health, including regulation of muscle and nerve activity as well as influence over sleep-wake cycles. Sleep problems and mild cognitive impairment frequently co-occur in older adults, with roughly half of those diagnosed with moderate to severe Alzheimer's disease reporting sleep disturbances. This connection suggests a potentially bidirectional relationship where poor sleep may accelerate cognitive decline.

The Emory research involved a small group of 54 participants who self-reported their vitamin D supplementation while undergoing standard cognitive testing. Notably, the study found no meaningful difference between the two common forms of vitamin D supplementation, suggesting the source or type may be less important than consistent daily intake at higher doses for potential cognitive benefit.