September 3, 2020
The first randomized controlled trial (RCT) of vitamin D in COVID-19 has just been published. The results are astounding: vitamin D nearly abolished the odds of requiring treatment in ICU. Although the number of deaths was too small to say for sure, vitamin D may actually abolish the risk of death from COVID-19.

The trial was conducted at the Reina Sofía University Hospital in Córdoba, Spain. The trial included 76 patients with COVID-19 pneumonia. Although this is no longer the standard of care, all patients were treated with hydroxychloroquine and azithromycin and, when needed, a broad-spectrum antibiotic. Admission to the ICU was determined by a multidisciplinary committee consisting of intensive care specialists, pulmonologists, internal medicine specialists, and members of the ethics committee.
The patients were randomly allocated to receive or not receive vitamin D in a 2:1 ratio. This resulted in 50 patients in the vitamin D group and 26 patients in the control group.

The vitamin D was provided as oral calcifediol, also known as calcidiol, 25(OH)D, and 25-hydroxyvitamin D. This is a metabolite of vitamin D that our livers make. It is is the principle form of vitamin D that circulates in the blood, and we use it as a measure of vitamin D status.
Traces of 25(OH)D occur in food, and it is five times as potent as vitamin D. As described on page 255 of the 1997 DRI Report, 25(OH)D is given an international unit (IU) value that equates it to vitamin D. Whereas one microgram (mcg) of vitamin D is 40 IU, 1 mcg of 25(OH)D is 200 IU.
The treatment in this RCT was soft capsules of 532 mcg 25(OH)D on day 1 of admission to the hospital, followed by 266 mcg on days 3 and 7, and then 266 mcg once a week until discharge, ICU admission, or death.
This is equivalent to 106,400 IU vitamin D on day 1, 53,200 IU on days 3 and 7, and 53,200 IU weekly thereafter. If this were given as daily doses, it would be the equivalent of 30,400 per day for the first week, followed by a maintenance dose of 7,600 IU per day.
The vitamin D status of the patients was not measured. However, the average vitamin D status in this region of Spain during the time of year in which the study was conducted is 16 ng/mL. A single dose of 100,000 IU vitamin D tends to raise a 25(OH)D of 10 ng/mL into the 20-30 ng/mL range. My suspicion is that the bolus dosing in the first week brought the patients’ vitamin D status into the 30-40 ng/mL range by the end of the week, and that most of the healing took place in the circa 40 ng/mL range.

The results are absolutely stunning. 50% of the control group (13 people) required admission to the ICU. Only 2% of those in the vitamin D group (one person) required admission to the ICU.
Expressed as relative risk, vitamin D reduced the risk of ICU admission 25-fold. Put another way, it eliminated 96% of the risk of ICU admission. Expressed as an odds ratio, which is a less intuitive concept but is often used in statistics because it gives an estimate of the effect of the treatment that would be constant across scenarios with different levels of risk, vitamin D reduced the odds of ICU admission by 98%. Either way, vitamin D practically abolished the need for ICU admission.
This was statistically significant at p
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