Plus, as has been know for, ever is:If you read the paper, that is not actually how the patients were assigned. The patients were assigned by the ward that they were located in and it appears that the patients in the wards that did not get treatment had a significantly lower level of Vitamin D before the treatment even started. That is a red flag as it indicates that the wards are not randomly populated. It is broadly accepted that Vitamin D levels are associated with worse outcomes. The question is whether supplementation helps. Another red flag is that they did not do their statistics correctly based on how they designed the study. The correct statistical test suggests that it is possible that there is no benefit at all.
They couldn't even successfully balance by gender. There is a significantly higher proportion of men in the non-treatment arm. And we know that is also associated with worse outcomes.
-get nutrients from food/balanced nutrition
-megadosing doesn't work because your body simply gets rid of what it can't use
-supplementation only works for deficient people (see point one)
-C dosing for cold/flu doesn't work, nor will D dosing for COVID-19