I think the parent poster is referring to https://www.medrxiv.org/content/10.1101/2020.11.16.20232397v1 https://www.medrxiv.org/content/10.1101/2020.11.16.20232

I think the parent poster is referring to https://www.medrxiv.org/content/10.1101/2020.11.16.20232397v1 https://www.medrxiv.org/content/10.1101/2020.11.16.20232397v... (Can't find the HN discussion link at the moment, unfortunately -- it didn't point to that particular link!) Worth noting that this RCT was for bolus supplementation of Vitamin D3 at some point in their hospital stay, and excluded patients already supplementing with D3. This study stands in stark contrast to the earlier pilot out of Spain: https://www.sciencedirect.com/science/article/pii/S0960076020302764?via%3Dihub#bib0100 https://www.sciencedirect.com/science/article/pii/S096007602... -- though as noted, this was not D3 but rather Calcifediol (a D3 metabolite), and a much smaller study.