Low 25-hydroxyvitamin D, but not the bioavailable fraction of 25-hydroxyvitamin D, is a risk factor for multiple sclerosis. Behrens JR, Rasche L, Gieß RM, Pfuhl C, Wakonig K, Freitag E, Deuschle K, Bellmann-Strobl J, Paul F, Ruprecht K, et al. Eur J Neurol. 2015 Jul 28. PMID: 26220765. Abstract CommentRecommendBookmarkWatch