https://www.theguardian.com/world/2020/nov/14/covid-uk-government-requests-guidance-on-vitamin-d-use
Finally! Free dminder app to guesstimate level. 5000-10000iu daily to get level into the 50-70 ng/ml range. Can confirm with blood test at Grassrootshealth.net
Share-share-share. Can end lockdown.