First of all, "my wife's son is a doctor" is not evidence. Second, of all, your inflammatory tone is unwarranted and adds nothing of value. It would be better

First of all, "my wife's son is a doctor" is not evidence. Second, of all, your inflammatory tone is unwarranted and adds nothing of value. It would be better if you actually looked at the sources and referenced those in your critique. Of course, it would also be good if you didn't misconstrue my argument, e.g. I neither claimed that there are no vitamin D absorption differences between ethnicities, nor that low levels of vitamin D aren't a problem; low levels of any vital nutritional element are a problems. I did state that I haven't yet seen evidence of a direct link from increased (i.e. more than average) vitamin D intake to a lower probability of being infected with or being seriously affected by covid19.