Vitamin D plays an important role in most diseases, including infectious disease, which is why from the very beginning of the COVID-19 pandemic, Dr. Mercola suspected that optimizing vitamin D levels among the general population would significantly lower COVID-19 incidence and death.
Since then, mounting evidence reveals this is indeed the case, as researchers have repeatedly demonstrated that higher vitamin D levels reduce rates of positive tests, hospitalizations and mortality related to this infection.
Vitamin D3 Reduces ICU Admissions and Mortality
Most recently, a Spanish study1,2 (which has yet to undergo peer-review) found giving supplemental vitamin D3 (calcifediol) to hospitalized patients with PCR-confirmed COVID-19 reduced ICU admissions by 82% and mortality by 64%.3 People who already had higher vitamin D at baseline were 60% less likely to die.
The study included 930 patients, 551 of whom received vitamin D3 — 532 micrograms on the first day of admission followed by 266 mcg on days 3, 7, 15 and 30. The remaining 379 patients served as controls.
All were given standard of care, which included hydroxychloroquine and an antibiotic (or two antibiotics in cases where bacterial infections were diagnosed), plus a steroid in cases involving pulmonary inflammation and/or cytokine storm.4 As reported by the authors:5
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