The team around Professor Gibbons at Johns Hopkins University has most likely stunned the medical world with its latest publication in Nature. Even I was surprised that the positive effects of vitamin D supplementation on COVID-19 infections and mortality are so strong and clear!

A quick summary? About 200,000 participants per group in the study. Supplementation with vitamin D2 or D3 in different doses. Infection reduction between 20 and 28%. Mortality reduction from 25 to 33%. Even stronger results in certain subgroups.

Can anyone seriously still claim that vitamin D supplementation has no effect?

And now that COVID-19 is emerging again, you cannot simply sweep the importance of this work under the rug...


Gibbons J.B. et al (2022) “Association between vitamin D supplementation and COVID-19 infection and mortality” Nature 12:19397