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Does Vitamin D Lower Risk of Severe COVID-19 Infection?

Most people do not realize this, but we are in the middle of various chronic disease pandemics that are interconnected by the way they affect our health. Vitamin D deficiency being one of them, many people are affected without even knowing it.

The sunshine vitamin, is an extremely important nutrient needed for all living things to thrive. Deficiency is known to weaken the immune system and viruses like the flu and COVID-19 attack the immune system. Having healthy vitamin D levels generally helps against any disease, it is essential for the functioning of the innate and adaptive immune system.


It’s no news that we are fast becoming an indoor species of humans living in isolated self-contained boxes. In most industrialized countries, we spend over 80 percent of our lives indoors, whether at homes, work, schools, restaurants or even in our car.

Did you know you can’t get sufficient UVB rays that trigger the synthesis of vitamin D through interior glass shielded windows or in a car? Virtually all commercial and automobile glass blocks UVB rays.

Evidence from several clinical trials and pooled studies show that vitamin D supplementation lowers the severity of acute respiratory tract infections. Benefits of supplementation have been proven among patients of all ages, including people with pre-existing chronic conditions.

To reduce the risk of severe infection, the Institute for Functional Medicine recommended that people at risk of influenza and/or COVID-19 consider taking at least 5,000 IU/d of vitamin D3 for a few weeks to rapidly raise 25(OH)D concentrations. The goal should be to raise 25(OH)D concentrations to optimal levels between 50–80 ng/mL (125–200 nmol/L).

Please note, anybody can get infected with COVID-19 regardless of their vitamin D levels, however, severe symptoms seem more likely among people deficient in Vitamin D.

Download my immune support guide to learn how to incorporate vitamin D rich foods in your diet, and other nutrient dense foods to improve your immune resilience.

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