Effect of vitamin D supplementation on motor symptoms in Parkinson's disease

Research has suggested that low vitamin D levels in the body may be linked to more severe motor symptoms in people living with Parkinson’s disease. Because of this possible connection, scientists have been exploring whether taking vitamin D supplements could help improve movement-related symptoms in Parkinson’s. Purpose of the Study This study set out to evaluate the impact of vitamin D supplementation on motor symptoms in Parkinson’s disease. It is currently the most thorough analysis on this topic, combining results from several clinical trials to understand the overall effect more clearly. How the Study Was Conducted Researchers reviewed data from 8 randomized controlled trials conducted up to September 2024, including a total of 646 participants with Parkinson’s disease. They used statistical methods to combine the results from these studies and looked at several standard movement assessments to measure the effects of vitamin D. Key Findings No Major Improvement in General Motor Symptoms: Vitamin D supplementation did not lead to significant improvements in commonly used tests for motor function, including: Unified Parkinson’s Disease Rating Scale Part III (UPDRS III) 10/8-Meter Walk Test Timed Up and Go (TUG) Test Improvement in Walking Endurance: A significant benefit was found in the 6-Minute Walk Test, where people who took vitamin D were able to walk farther compared to those who did not receive the supplement. What This Means for People with Parkinson’s While vitamin D supplements may not improve all movement-related symptoms, they could help enhance walking endurance — a meaningful benefit for maintaining independence and mobility. Importantly, the results suggest that vitamin D may also play a role in the underlying processes of Parkinson’s disease, possibly slowing its progression, although more research is needed. Final Thoughts This study highlights the potential of vitamin D supplementation as part of a broader approach to managing Parkinson’s disease. As always, people living with Parkinson’s should talk to their healthcare providers before starting any new supplements to ensure they are safe and appropriate for their individual health needs.