Vitamin D Improves Cognition in At Risk Population

The scientific evidence for the benefits of vitamin D for dementia and Alzheimer’s is rapidly accumulating. This new study adds even more.

Mild Cognitive Impairment (MCI) is that area of cognition that is worse than the normal cognitive decline expected from aging but not as serious as the cognitive decline of Alzheimer’s.

46% of people with MCI experience sleep disturbances. The trouble is, the MCI makes the sleep disturbances worse, and then the sleep disturbances make the MCI worse.

Around 27% of people with MCI progress to Alzheimer’s disease. The period of MCI may be an important window for preventing Alzheimer’s. And vitamin D might help to do just that, according to this new study.

The study of 54 people with MCI and sleep disturbances found that those who supplemented 5000 IU of vitamin D a day or more had significantly better cognition as measured by the Montreal Cognitive Assessment compared to people who did not take vitamin D daily.

This is the first study to suggest the potentially valuable possibility that simply taking vitamin D could preserve cognition in people with MCI and sleep disturbances.

Sleep Medicine. Oct 2026;146:108960.

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For much more on preventing and treating MCI, dementia and Alzheimer’s, see our book The Family Naturopathic Encyclopedia.

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