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We found that higher levels reported sun exposure, rather than 25(OH)D levels, were associated with less depressive symptoms and levels of fatigue. The role of UV or light therapy will need to be evaluated in randomized controlled trials to confirm an effect on these symptoms in MS.

IL-10 producing B cells are diminished in AAV. Furthermore, Breg might regulate Th1 cells and are associated with Treg in quiescent AAV. Suppression of Th1 cells by Breg may be insufficient in active AAV.

This study shows a negative correlation between vitamin D status and depressive symptoms in patients with MS. Although multiple confounders exist, we observed an indication that vitamin D status might contribute to the presence of depressive symptoms in MS. Therefore, further studies on vitamin D in MS should include depressive symptoms as outcome measures to confirm these findings.