@SirVixofVixHall
Latest zoe study shows that vitamin D makes a negligible difference.
Not really
@SirVixofVixHall
Take from the press release:
We found that multivitamins, vitamin D, omega-3, and probiotic supplements all had a small protective effect against testing positive for the virus. We found that multivitamins, vitamin D, omega 3, and probiotic supplements all modestly helped protect women, but we didn’t see the same consistent protective effect for men.
As they go on to point out, it wasn't a clinical trial (so there could be many other factors that have skewed the results). There may have been reporting bias (ie men were less accurate in reporting their regimen), it could be that people that take supplements are more likely to lead a healthy lifestyle or are more concerned about protecting themselves from COVID-19 so are more cautious in other ways. It also doesn't take into account whether participants were deficient in Vitamin D or not as that wasn't tested. It is entirely possible to be deficient even though you are taking a supplement and vice versa. It also doesn't seem to take into account the dosage taken by participants.
As they say:
"Our research is an observational study and not a clinical trial, so it is quite speculative, and we can’t make strong recommendations based on the data we have."
I would say the fact that they found a moderate benefit from taking vitamin D but not other vitamins (eg vitamin C or zinc) is a positive. As there have been several studies (but not all) that have found a link with vitamin D deficiency and COVID-19 risk, I would say that the Zoe study is further evidence that it is worth taking vitamin D supplements. A small benefit is better than none.
The report, like all scientific papers, is written cautiously and is careful not to overstate any findings. The findings of the QMUL clinical trial of high dosage vitamin D will be much more informative.