The study

The researchers divided the participants (average age of 43; 54 women, 6 men) into 3 groups who took one of the following:

  • 4,000 IU of vitamin D3 daily
  • 8,000 IU of vitamin D3 daily
  • No intervention (the control)

At the end of the trial, the levels of complement component 3, complement component 4, and plasma vitamin D had increased (improved) in the 2 vitamin D groups and were higher (better) than in the control group. Also, in both vitamin D groups, fatigue symptoms decreased (improved) and were lower (better) than in the control group.

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The results

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This Study Summary was published on June 2, 2025.