Cardiffjack said:
I haven’t said vitamin d will stop infection and don’t think anyone has. Also what do you think is an excess dose . The guidelines in this country is 400 IU a day, which is absolutely inadequate for helping your immune system. I take 4,000 IU a day and haven’t had even a common cold for years.
There is evidence that lots of people who have bad cases of COVID-19 are vitamin d deficient.
Very close to what you take.
Even if the U.K. levels are too low your are probably taking three to four times what you need. Yes, micronutrient deficiency is a risk factor for serious COVID. Ageing and immunity is relatively poorly understood and micronutrient deficiency may be part of this. But, you cannot boost immunity in any safe or meaningful way. If you have a healthy lifestyle and diet, all the supplements and superfoods in the world will not make one iota of difference. There is weak evidence that echinacea has some effect, but tempered with an increased risk of lymphoma. Good for you if you have not had a cold, but there is no way you can consider vitamin d is responsible. My father-in-law says the same thing. When I retired I started taking supplements and have barely had a cold in ten years. But he also has contact with a handful of people per day, not hundreds in a factory.
This is why you need trained epidemiologists to sort out population studies, not the armchair sort. Not my area I admit but I can understand the limitations.
I am an experimentalist and can control variables and confounding factors. Much harder in a population.