Genetics

Research increasingly suggests that vitamin D may play an important role in the development of multiple sclerosis (MS). Using Mendelian randomization, Mokry and colleagues examined genetic variants associated with lower circulating vitamin D levels and found that genetically reduced 25-hydroxyvitamin D was associated with substantially greater susceptibility to MS. This blog post explores the study's scientific methods, major findings, biological significance, and limitations, while explaining why the results strengthen the case for further randomized clinical trials investigating whether maintaining adequate vitamin D levels could contribute to MS prevention.