After adjusting for demographic variables and comorbidities, this retrospective analysis of COVID-positive patients in New York City, shows a significant association between low 25(OH)D levels and an increased likelihood of need for oxygen support.
In this observational study, treatment with cholecalciferol booster therapy, regardless of baseline serum 25(OH)D levels, appears to be associated with a reduced risk of mortality in acute in-patients admitted with COVID-19.
In this 154 patient prospective cohort study in India, individuals with severe COVID-19 had lower vitamin D levels and were more likely to be vitamin D deficient. Deficient patients were more likely to pass...
In this 40 person randomized, placebo-controlled study in India a greater proportion of vitamin D-deficient individuals with mildly symptomatic COVID-19 infections tested COVID-19 negative...
This 129 person cohort study conducted in Italy did not report a relationship between vitamin D levels and health outcomes in the enrolled COVID-19 population.
In this small, case control study conducted in China there was an association between vitamin D deficiency and COVID-19, especially in severe cases.
In this cohort study of 489 patients who had a vitamin D level measured in the year before COVID-19 testing, the relative risk of testing positive for COVID-19 was 1.77 times greater for patients with likely deficient vitamin D status compared...
Plasma 25(OH)D levels less than 75 nmol/L appear to be an independent risk factor for COVID-19 infection and hospitalization in the Israeli population.
In this small, quasi experimental study, elderly, frail nursing home residents in France diagnosed with COVID-19 who were given a high, single dose of vitamin D during or just before COVID-19 infection experienced an improved survival rate...
