Vitamin D for mental health and physical function with diabetes: Is a higher dose better? Original paper

In this 1-year randomized controlled trial in older African American people with type 2 diabetes, taking a higher dose of vitamin D was no better than a lower dose for improving depression symptoms and physical function.

This Study Summary was published on April 16, 2025.

The study

All 75 of the participants (ages 55–80; 72% women, 28% men) had insufficient vitamin D levels at baseline. They were assigned to take either 600 IU or 4,000 IU of vitamin D daily.

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The results

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This Study Summary was published on April 16, 2025.