French National Academy recommended 100,000 IU of Vitamin D to elderly to fight COVID-19
[Press release from the National Academy of Medicine: Vitamin D and Covid-19]
"recommends the rapid serum vitamin D (i.e. 25 OHD) testing in people over 60 years of age with Covid-19, and a loading dose of 50,000 to 100,000 IU in case of deficiency, which could help limit respiratory complications;
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1. Should not wait days for results of a Vitamin D test if already infected, just supplement* Can speedup the restoration of the Vitamin D and immune system by taking Vitamin D in the form of nanoemulsion topically or mucosal - eliminating the delay by the liver and kidneys1. Everyone should have the dose, not just the elderly1. Obese will usually need a 2X larger dose1. Monthly (or bi-weekly) dosing is great for prevention
66% of the Vitamin D COVID-19 RCTs use at least 100,000 IU in the first week

Many clinical trials are underway which are testing Vitamin D to fight COVID-19

COVID-19 treated by Vitamin D - studies, reports, videos
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Loading Dose of Vitamin D category has the following
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- Nursing home in France. Typically 50,000 IU monthly
Annweiler recommendations for Vitamin D for COVID-19, etc. often start with 200,000 - June 2021