Minute-9:30 Patients vitamin D levels should be tested upon admission. Calcifediol, fast acting vitamin D should be administered when low. Works right away, unlike D3, which can take a week or two to be bioavailable to fight infection and disease.
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Preventive Vitamin D Supplementation and Risk for COVID-19 Infection: A Systematic Review and Meta-Analysis
https://www.mdpi.com/2072-6643/16/5/679
(28th Feb 2024)