The statement is broadly that this is not intended as a treatment but offers a useful way of deciding how likely a patient is to not respond to initial therapy.

The statement is broadly that this is not intended as a treatment but offers a useful way of deciding how likely a patient is to not respond to initial therapy. I don't think a sensible person is suggesting a massive dose of vitamin d on a arrival is a cure. As for the consequence of is the deficiency linked to poor otherwise health that is interesting to disentangle. This does offer a very good explanation to the idiotic statements of "covid is racist". I.e. if it is linked to vit-d deficiency it offers a way to reduce deaths in minorities. These early concerns suggested that covid would hit Africa for instance really badly, and it is yet to do so.