1. Covid-19: Public health agencies review whether vitamin D supplements could reduce risk
2. Scientific Advisory Commission on Nutrition. Rapid review: vitamin D and acute respiratory tract infections, June 2020. https://app.box.com/s/g0ldpth1upfd7fw763ew3aqa3c0pyvky.
3. Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis of individual participant data
4. NICE. Covid 19 rapid evidence summary: vitamin D for covid-19 evidence summary. 29 June 2020. www.nice.org.uk/advice/es28/chapter/Key-messages.
5. Royal Society. Vitamin D and covid-19. 18 June 2020. https://royalsociety.org/-/media/policy/projects/set-c/set-c-vitamin-d-and-covid-19.pdf.