Vitamin D prevents COVID, keeps you out of the ICU and prevents death

Over 200 health scientists and medical experts have signed an open letter calling for “immediate widespread increased vitamin D intakes” to fight COVID ( The letter is endoresed in an introductory letter by former US Surgeon General Richard H. Carmona.

The researchers highlight the following points:

Low levels of vitamin D almost certainly promote COVID-19 infection; higher levels of vitamin D are associated with lower rates of COVID infection

Higher levels of vitamin D are associated with lower risk of severe cases, hospitalization and admission to ICU

Vitamin D is a very effective treatment

Higher levels of vitamin D are associated with lower risk of death

Vitamin D affects COVID risk more strongly than most other health conditions

Evidence “suggests the possibility that the COVID-19 pandemic sustains itself in large part through infection of those with low vitamin D”

• Evidence suggests that “deaths are concentrated largely in those with vitamin D deficiency”

Increased vitamin D would reduce infections, hospitalizations, ICU admissions, & deaths

The levels of vitamin D needed are very safe, and vitamin D is safer than drugs

Many factors predispose people to higher risk of COVID, “but inadequate vitamin D is by far the most easily and quickly modifiable risk factor with abundant evidence to support a large effect”

Adults should take 4,000IU of vitamin D a day

Powerful Studies
People with vitamin D deficiency are a significant 1.77 times more likely to get COVID. But if you give them vitamin D, the increased risk disappears. That suggests that taking vitamin D reduces your risk of getting COVID (JAMA Netw Open 2020;3(9):e2019722).

The newest vitamin D study looked at vitamin D levels in 186 COVID patients hospitalized with severe acute respiratory syndrome. “A remarkably high” 59% of them were vitamin D deficient. The lower their vitamin D, the worse their infection: in men, 55% of stage 1 patients were deficient in D; 74% of stage 3 patients were.

Blood levels of vitamin D below 20 ng/ml indicate a severe deficiency. In this study, almost everyone with blood levels below 19 ng/ml died. Blood levels below 25 ng/ml indicate a vitamin D deficiency. 85% of people with levels below 25 ng/ml died. The optimal level of vitamin D is 50-80 ng/ml. When blood levels reached just 34ng/ml, nobody died: 0%. Patients who were deficient in D were 387% more likely to die.

These startling results show that blood levels of vitamin D are associated with disease severity and risk of dying from COVID-19. COVID patients with vitamin D deficiency are almost 4 times more likely to die, and, in this study, nobody died if their vitamin D levels even approached normalcy (Am J Clin Pathol 2021;15(3):381-8).

Another recent study of people with COVID who were hospitalized with symptoms of acute respiratory infection put them into a control group who received “best available therapy” or a group who also got vitamin D. The study used a highly absorbable form of vitamin D known as calcifediol. The people in the study had a variety of comorbidities. But, regardless of comorbitities, only 2% of the vitamin D group had to be admitted to ICU. 50% of the control group had to go into ICU. 8% of the control group died. No one in the vitamin D group died. And everyone in the vitamin D group was discharged without complications (J Steroid Biochem Mol Biol 2020 Oct;203:105751).


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