Individuals who are deficient in vitamin D have been found to be at an increased risk of severe COVID-19 disease. In addition to strengthening teeth and bones, vitamin D supports nervous, brain and immune system health, lung and cardiovascular function and regulates insulin levels.
A 2021 large-scale observational study revealed that high vitamin D levels may be protective against COVID-19 and noted that while the recommended dietary allowance for vitamin D is 600 to 800 international units (IUs) per day, the National Academy of Medicine states that up to 4,000 IUs per day is safe for the majority of people. Another 2021 study found that persons with low vitamin D levels were at higher risk of serious disease, increased intensive care unit stays, and death. Ensuring adequate vitamin D levels may prevent a person from developing serious COVID-19 illness.
