Perhaps the Vitamin D deficiency pandemic caused the COVID-19 pandemic
Support for the conjecture
Fact: (before 2020) more viral infections if low Vitamin D
7X less risk of influenza if Vitamin D levels higher than 30 ng – Oct 2017
Observation More likely to be infected and/or die of COVID-19 if low vitamin D
COVID-19 treated by Vitamin D - studies, reports, videos as of July 29 included
21 trials, +10 observational studies, +7 recommendations, +34 associations, +58 speculations
Fact: Vitamin D levels have been crashing since 1993

click on chart for details
Fact: Low Vitamin D is associated with poor health
Vitamin D Meta-analyses finding an association of low Vitamin D with 26+ health problems
Fact: Supplementing with Vitamin D improves Health
50,000 IU of Vitamin D twice a month proven to fight #F00:25 health problems
50,000 IU of Vitamin D once a week proven to fight an additional #F00:17 health problems
See also VitaminDWiki
There are 2 concurrent pandemics – COVID-19 and Vitamin D deficiency – May 13, 2020
- vs conjecture on this page that D ==> COVID
Preventing a COVID-19 pandemic with Vitamin D – Grant April 2020
See also web
Perhaps solve the other pandemic: Vitamin D deficiency — to help beat Coronavirus?
- April 9, Joanneova - Australia 258 comments 10 days later
Vitamin D deficiency as risk factor for severe COVID-19: a convergence of two pandemics
preprint May 5. updated May 18
186 patients. Lower Vitamin D levels associated with worse COVID-19 only for males
