I don't know what you mean by "these studies" as the link is to only one study. This study does a pretty questionable job of establishing that any amount of vi

I don't know what you mean by "these studies" as the link is to only one study. This study does a pretty questionable job of establishing that any amount of vitamin D levels reduces likelihood of severe infection. It doesn't even attempt to say what level of supplementation would lead to what vitamin D levels. So I think the answer to your question is a firm, "No."