Yes, this means you should measure your blood Vitamin D and supplement whenever it shows up as deficient (much more likely in the winter). Yes, correlation does

Yes, this means you should measure your blood Vitamin D and supplement whenever it shows up as deficient (much more likely in the winter). Yes, correlation does not prove causation, and yes, the recent randomized controlled study[0] may have problems too, but in aggregate the evidence is overwhelming. Don’t forget! [0] https://www.sciencedirect.com/science/article/pii/S0960076020302764 https://www.sciencedirect.com/science/article/pii/S096007602...