People love their pills. Personally I think D3 is going to be a bigger factor looking at the epidemiology. All the risk factors and populations are inversely correlated with D3 status much more so than Zn levels. Get both low and we have the tragedy we see now. Modern diets and lifestyles…smh. I never get sick, but also supplement high dose D3, moderate Zn, high C, moderate E, and a multi.