Experts have found that dietary supplements with vitamin D are unlikely to prevent infection with COVID-19 or other respiratory infections. Even if the vitamin level in the blood of a person is low.
Two large-scale studies conducted at the height of the pandemic showed that dietary supplements with vitamin D are unlikely to provide additional protection against coronavirus infection. In the first study, 3,100 people with low levels of this vitamin received various doses of it. But in any quantities, vitamin supplements did not reduce the risk of acute respiratory infections, including colds or flu, as well as coronavirus and even the severity of its course.
The second double-blind randomized clinical trial involved 34,000 Norwegians. Part received fish oil, and the second part received a placebo. Cod liver oil naturally contains doses of vitamin D, vitamin A and Omega-3 fatty acids. And here dietary supplements did not prevent coronavirus, did not reduce the severity of its course and did not additionally protect against acute respiratory tract infections.
The first study was conducted by experts from Queen Mary University of London, and the second by the University of Oslo. This is further proof that vitamin D is not a protection factor against coronavirus infection, as was assumed in the first months of the pandemic.
