This supplement reduces the risk of coronavirus infection by a factor of 12
No, the human study conducted within Istanbul Kanuni Sultan Suleyman Training and Research Hospital is far from perfect. But it does offer the prospect of a supplement that may significantly reduce the risk of infection with the corona virus. The ingredients can be found in every webshop or vitamin shop.
Quercetin as a virus inhibitor
There is some evidence that both vitamin C and quercetin have antiviral properties. On the basis of basic biomedical research, some doctors even suspect that these substances might provide synergistic protection. [Front Immunol. 2020 Jun 19;11:1451.]
In animal studies, quercetin hinders virus infection by blocking the receptors that allow viruses to enter cells, while vitamin C increases the bioavailability of quercetin.
The Turks were inspired by this theory, and decided to conduct an experiment with a self-invented supplement consisting of quercetin, vitamin C and bromelain. The idea behind the addition of bromelain is that this substance, like vitamin C, should increase the bioavailability of quercetin.
The researchers supplemented 71 nurses aged 20-60 in their hospital, who had frequent contact with Covid-19, twice a day for 113-118 days. This supplement provided the nurses with 500 milligrams of quercetin, 500 milligrams of vitamin C and 50 milligrams of bromelain daily.
A control group of 42 nurses received no supplement. They also did not receive a placebo, which is a downside of the study's design.
The supplement worked. In the supplementation group, exactly 1 subject received Covid, in the control group 9. This implies that supplementation reduced the chance of infection by a factor of 12. And yes, this effect was statistically significant. The p was 0.031.
Arslan, Bengu and Ucuncu Ergun, Nurcan and Topuz, Seyma and Yilmaz Semerci, Seda and Suner, Nurettin and Kocatas, Ali and Onal, Hasan, Synergistic Effect of Quercetin and Vitamin C Against COVID-19: Is a Possible Guard for Front Liners. Available at SSRN: https://ssrn.com/abstract=3682517 or http://dx.doi.org/10.2139/ssrn.3682517.
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