Wednesday, June 19, 2024
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Vitamin D Supplementation has No Effect on Bone Health in Multiple Sclerosis Patients

Multiple sclerosis often results in physical disability, which is exacerbated by osteoporosis and bone fractures. Holmøy and colleagues examined the effects of vitamin D supplementation on multiple sclerosis and bone health, but found that it has no clear benefits.

 

Multiple sclerosis, or MS, is a condition in which the immune system attacks and erodes the fatty sheaths that cover, protect, and insulate nerve fibers. Without this fatty cover, nerve fibers cannot get signals to their destination, resulting in physical and psychiatric issues. As a result of physical disability and steroid use, MS patients typically suffer from high rates of osteoporosis and bone fracture, which further worsens the burden of the disease. The cause of MS is unknown, but some researchers have suggested that vitamin D may slow progression of the disease and help maintain bone health in individuals with MS.

In a small study published in BMC Neurology, Holmøy and colleagues examined the effect of vitamin D supplementation on multiple sclerosis and bone health. Their study included 71 Norwegian MS patients between 18 and 50 years of age who did not have other conditions that may affect bone. Patients received either a weekly 20,000 IU vitamin D supplement or a placebo, and all participants received a daily 500 mg calcium supplement as well. The researchers then measured bone mineral density using a densitometer, and measured blood concentration of different proteins linked to bone growth at baseline, 48 weeks, and 96 weeks.

The treatment and placebo groups did not differ at baseline in measured biomarkers of bone growth, but the treatment group had lower parathyroid hormone levels than the placebo group at the end of the study. However, the link between these markers of bone growth and bone mineral density is weak. There were no differences between individuals who were also receiving treatment for other MS symptoms.

The researchers conclude that vitamin D supplementation does not influence bone health in individuals with multiple sclerosis. Supplementation may only be beneficial for individuals who are already vitamin D deficient, or may be more useful as a daily, rather than weekly, pill. These results are consistent with other studies looking at vitamin D supplementation in the general population. However, over half of the patients in the placebo group were using vitamin D supplements that were not provided as part of the study, which may mask differences between the treatment and placebo group. Future studies will also require much larger sample sizes.

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