Comment on

• Vitamin D and disease activity in multiple sclerosis before and during interferon-β treatment.

  Løken-Amsrud KI, Holmøy T, Bakke SJ, Beiske AG, Bjerve KS, Bjørnarå BT, Hovdal H, Lilleås F, Midgard R, Pedersen T, Benth JS, Sandvik L, Torkildsen O, Wergeland S, Myhr KM. Løken-Amsrud KI, et al. Neurology. 2012 Jul 17;79(3):267-73. doi: 10.1212/WNL.0b013e31825fdf01. Epub 2012 Jun 13. Neurology. 2012. PMID: 22700809
• Lower serum vitamin D levels are associated with a higher relapse risk in multiple sclerosis.

  Runia TF, Hop WC, de Rijke YB, Buljevac D, Hintzen RQ. Runia TF, et al. Neurology. 2012 Jul 17;79(3):261-6. doi: 10.1212/WNL.0b013e31825fdec7. Epub 2012 Jun 13. Neurology. 2012. PMID: 22700811
• Interferon-β and serum 25-hydroxyvitamin D interact to modulate relapse risk in MS.

  Stewart N, Simpson S Jr, van der Mei I, Ponsonby AL, Blizzard L, Dwyer T, Pittas F, Eyles D, Ko P, Taylor BV. Stewart N, et al. Neurology. 2012 Jul 17;79(3):254-60. doi: 10.1212/WNL.0b013e31825fded9. Epub 2012 Jun 13. Neurology. 2012. PMID: 22700816