Mixed messaging on Vit D & COVID-19

Vit D and Covid-19 correlation versus causality?  A short summary:

https://www.mcgill.ca/oss/article/covid-19-health/truth-about-vitamin-d-and-covid-19

https://www.mayoclinic.org/diseases-conditions/coronavirus/expert-answers/coronavirus-and-vitamin-d/faq-20493088

https://jamanetwork.com/journals/jama/fullarticle/2775003