Sudden drop of heart rate (vasovagal syncope) is associated with lower vitamin D - several studies | VitaminDWiki
Common cause of dizziness (BPPV) reduced 5 X by several doses of 50,000 IU of vitamin D – 2015, 2016 | VitaminDWiki
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The Schellong test: detecting orthostatic blood pressure and heart rate changes in German-speaking countries | Clinical Autonomic Research
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