Maybe Vitamin D reduces all-cause hospitalization
Those vitamin D level statistics have been floating around for months. What's missing is a placebo-controlled study to see whether supplementation would make a difference. But that involves more than just clicking a bit of statistics.
[0]https://clinicaltrials.gov/ct2/show/NCT04536298
[1] https://clinicaltrials.gov/ct2/show/NCT04385940
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4463890/#:~:tex....
Unfortunately, [0] and [1] are still ongoing and [2] reads like a blog post of somebody ranting about a statistical error, followed by some anecdotal evidence and the demand for an actual study. There could still be something there, but summarizing all of that as "quite obviously works" is stretching it.