High dose Vitamin D intake and quality of life in relapsing-remitting multiple sclerosis: a randomized, double-blind, placebo-controlled clinical trial

Background: Low level of vitamin D is associated with a more severe course and low quality of life in relapsing-remitting multiple sclerosis (RRMS). Low dose vitamin D intake has improved quality of life in RRMS patients. Objective: This study explored the effect of high dose vitamin D intake on quality of life in RRMS patients in a double blind randomized clinical trial. Methods: 94 RRMS patients were randomized to two groups. One group received 50,000 IU vitamin D3 every five days for 3 months. The other group received placebo. Interferon-beta (IFN-beta) continued as the main treatment in both groups. Quality of life was assessed using MSQOL-54 Persian version at the beginning and at the end of the study. Results: After 3 months, the vitamin D group had a significant difference in mental health composite with placebo group, 62.41 +/- 13.99 vs. 60.99 +/- 17.99 (p-value = 0.041). Change in health was 75.74 +/- 25.73 and 70.59 +/- 26.45 in vitamin D and placebo group, respectively (p-value = 0.036). Conclusions: Mental QOL improved significantly after taking high dose vitamin D for 3 months in vitamin D group relative to placebo.