One issue with supplementation is the food matrix effect - Yes, Vitamin deficiencies are associated with all kinds of badness, but just supplementing this one n

One issue with supplementation is the food matrix effect - Yes, Vitamin deficiencies are associated with all kinds of badness, but just supplementing this one nutrient doesn't address the underlying problem and often doesn't improve clinical outcomes. Rather, the deficiency is an indicator of poor health satus and to be fixed by adjusting the dietary pattern. That's the thing with a lot of vitamin d and c associations anyway.