When? September.
Of whom? Cordoba University of Spain.
What have scientists studied? 50 patients at Covid-19 Hospital with Covid-19 received vitamin D. Their health results were compared with 26 volunteers in a control group who were not given the tablets.
What did they find? Only one of the 50 patients needed intensive care and none died. Half of the 26 virus patients who did not take vitamin D were subsequently admitted to intensive care and two died.
What were the limitations of the study? The small pool of volunteers. Patients’ vitamin D levels were not checked before admission. Comorbidities were not taken into account.
When? September.
Of whom? University of Chicago.
What have scientists studied? Vitamin D levels of 500 Americans were tested. The researchers then compared the levels of the volunteers with the number captured by the coronavirus.
What did they find? Rates of 60% higher than Covid-19 among people with low levels of “solar vitamin”.
What were the limitations of the study?
The researchers did not verify other compositional factors. It is unclear whether or not the volunteers were deficient in vitamin D during coronavirus testing. The age of the people, the place of work and the place where they lived – factors that greatly increase the chance of contracting the virus – were not taken into account.
When? September.
Of whom? Tehran University in Iran and Boston University.
What have scientists studied? Data analyzed from 235 patients hospitalized with Covid-19.
What did they find? Patients who had enough vitamin D – at least 30 ng / ml – were 51.5% less likely to die from the disease. They also had a significantly lower risk of becoming seriously ill or in need of ventilation. Patients who had a lot of nutrients also had less inflammation – often a deadly side effect of Covid-19.
What were the limitations of the study? Confused factors such as smoking and social economic status have not been recorded for all patients and could have an impact on the severity of the disease.
When? July.
Of whom? Tel Aviv University, Israel.
What have scientists studied? 782 people who tested positive for coronavirus had vitamin D levels before infection evaluated retrospectively and compared with healthy people.
What did they find? People with vitamin D levels below 30 ng / ml – optimal – were 45% more likely to test positive and 95% more likely to be hospitalized.
What were the limitations of the study? They did not look at the underlying health conditions and did not check vitamin D levels at the time of infection.
When? June.
Of whom? Free University of Brussels.
What have scientists studied? Vitamin D levels compared in nearly 200 patients at Covid-19 Hospital with a control group of over 2,000 healthy people.
What did they find? Men who were hospitalized with the infection were significantly more likely to have vitamin D deficiency than healthy men of the same age. Deficiency rates were 67% in the COVID-19 patient group and 49% in the control group. The same thing was not found in women.
What were the limitations of the study? Independent scientists say that the level of vitamin D in the blood decreases when people develop serious diseases, which the study did not take into account. This suggests that the disease is the one that leads to the decrease in the level of vitamin D in the blood in this study and not the other way around.
When? June.
Of whom? Inha University in Incheon, South Korea.
What have scientists studied? 50 hospitalized patients with Covid-19 were checked for all vital vitamin levels and compared with a control group.
What did they find? 76% of them were deficient in vitamin D, and a severe vitamin D deficiency (<10 ng / dl) was found in 24% of patients with Covid-19 and only 7% in the control group.
What were the limitations of the study?
The small sample and the researchers did not take into account the decrease in the level of vitamins when they get sick.
When? June.
Of whom?. Independent scientists from Indonesia.
What have scientists studied? Vitamin D levels were checked in 780 patients at Covid-19 Hospital.
What did they find? Almost 99% of the patients who died had vitamin D deficiency. Of the patients with vitamin D levels higher than 30 ng / ml – considered optimal – only one percent died.
What were the limitations of the study? It has not been evaluated by colleagues by colleagues, a process that often reveals flaws in studies.
When? May.
Of whom? University of Glasgow.
What have scientists studied? Vitamin D levels in 449 people in the UK Biobank who had confirmed Covid-19 infection.
What did they find? Vitamin D deficiency has been associated with an increased risk of infection – but not after adjustment for founders such as ethnicity. It led the team to conclude that “their findings do not support a potential link between vitamin D levels and the risk of Covid-19 infection.”
What were the limitations of the study? Vitamin D levels were taken 10 to 14 years ago.
When? May.
Of whom? University of East of England.
What have scientists studied? Mean vitamin D levels in populations in 20 European countries were compared with rates of Covid-19 infection and death at that time.
What did they find? The average level of vitamin D in each country was “strongly associated” with higher levels of Covid-19 cases and deaths. The authors said at the time, “The most vulnerable population group for Covid-19 is also the one with the highest vitamin D deficiency.”
What were the limitations of the study? The number of cases in each country was affected by the number of tests performed, as well as by the various measures taken by each country to prevent the spread of the infection. And he only looked at the correlation, not the causality.
When? May.
Of whom? Northwestern University.
What have scientists studied? Detailed data from dozens of studies around the world that included vitamin D levels among patients with Covid-19.
What did they find? Patients with severe deficiency are twice as likely to experience major complications and die.
What were the limitations of the study? Cases and deaths in each country were affected by the number of tests performed.