Correlation may not be causation, but it does provide a null hypothesis to fire at. And people with adequate vitamin D seem to die less (https://www.mayoclinicp

Correlation may not be causation, but it does provide a null hypothesis to fire at. And people with adequate vitamin D seem to die less (https://www.mayoclinicproceedings.org/article/S0025-6196(18)30183-6/fulltext https://www.mayoclinicproceedings.org/article/S0025-6196(18)...). Hence the conclusion in this paper (which does have dosages in it). https://www.mdpi.com/2072-6643/12/7/2097/htm https://www.mdpi.com/2072-6643/12/7/2097/htm "The bottom line is that there is no downside to increasing our intake of vitamin D to maintain serum 25(OH)D at at least 30 ng/mL (75 nmol/L), and preferably at 40–60 ng/mL (100–150 nmol/L) to achieve optimal overall health benefits of vitamin D."