Vitamin D may not protect against covid-19

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Vitamin D may not protect against covid-19 

A recent editorial in the BMJ referred to two published RCTs.1  Cross-sectional studies report a  link between low serum vitamin D levels and catching covid-19. One trial in the UK compared vitamin D at either 3200 IU/day vs 800 IU/day for six months and found no difference in the prevalence of covid-19. 65% of participants had less than 75 nmol/L of blood vitamin D. The other was in Norway, where low dose vitamin D was given vs placebo, and no difference was seen. 

The authors suggest not giving vitamin D to those with normal vitamin D levels, instead focusing on higher-risk people such as pregnant women, the elderly and those with less exposure to the sun, and supplement 1000-2000 IU/day if they have low blood levels of vitamin D. The standard NZ cholecalciferol contains 50,000 IU of vitamin D. 


  1. Can vitamin D protect against covid-19? Two new trials find no effect, but aren’t the final word BMJ (2022)   View here

Gems are chosen by the Goodfellow director Dr. Bruce Arroll to be either practice changing or practice maintaining. The information is educational and not clinical advice.

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