Vitamin D, now conclusive that Dr John Campbell can’t critically assess a study

Effect of calcifediol treatment and best available therapy versus best available therapy on intensive care unit admission and mortality among patients hospitalized for COVID-19: A pilot randomized clinical study
https://www.sciencedirect.com/science/article/pii/S0960076020302764
Calcifediol Treatment and COVID-19–Related Outcomes
https://academic.oup.com/jcem/article/106/10/e4017/6294179

Effect of a Single High Dose of Vitamin D3 on Hospital Length of Stay in Patients With Moderate to Severe COVID-19: A Randomized Clinical Trial
https://doi.org/10.1001/jama.2020.26848

High-dose vitamin D versus placebo to prevent complications in COVID-19 patients: Multicentre randomized controlled clinical trial
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0267918

A single-oral bolus of 100,000 IU of cholecalciferol at hospital admission did not improve outcomes in the COVID-19 disease: the COVID-VIT-D—a randomised multicentre international clinical trial
https://bmcmedicine.biomedcentral.com/articles/10.1186/s12916-022-02290-8

COVID-19 and vitamin D (Co-VIVID study): a systematic review and meta-analysis of randomized controlled trials
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8862170/

Effect of a test-and-treat approach to vitamin D supplementation on risk of all cause acute respiratory tract infection and covid-19: phase 3 randomised controlled trial (CORONAVIT)
https://www.bmj.com/content/378/bmj-2022-071230

A review of the growing risk of vitamin D toxicity from inappropriate practice
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5980613/

Vitamin D Global Market Report 2023 – By Type (Vitamin D3, Vitamin D2), By IU Strength (500,000 IU, 100,000 IU, 40 MIU), By Form (Oil, Powder), By End User (Adults, Pregnant Women, Children) – Market Size, Trends, And Global Forecast 2023-2032
https://www.thebusinessresearchcompany.com/report/vitamin-d-global-market-report

NHS guidance on vitamin D
https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-d/