One analysis of 13 studies concluded that vitamin D deficiency was associated with an increased risk of atrial fibrillation (Nutrition Journal, Nov. 14, 2019).  A randomized controlled trial found that high-dose short-term vitamin D supplements helped prevent A-Fib after coronary bypass surgery (General Thoracic and Cardiovascular Surgery, May, 2020). 

One of the reasons doctors worry about atrial fibrillation is that patients have an increased possibility of blood clotting when it is not moving properly through all the heart’s chambers. One study recruited 200 people with A-Fib taking anticoagulants to prevent clots (Nutrition, Metabolism, and Cardiovascular Diseases, June 25, 2020). Those with low levels of 25-hydroxyvitamin D were more likely to develop a clot anyway. Such clots are especially dangerous because they can move into the brain and cause strokes.

This research adds weight to the importance of knowing your vitamin D level. To learn more about this crucial nutrient, you may want to read our eGuide to Vitamin D and Optimal Health. This electronic resource may be found in the Health eGuides section of this website.