“It looks like patients with poor vitamin D status could have more severe COVID-19,” stated Dr. Hans Konrad Biesalski, professor at the University of Hohenheim, Germany in “Healthline.” He evaluated vitamin D and COVID-19.  Here is his explanation for vitamin D level problems: “The most important vitamin D source is through the formation of sunlight in the skin, which seems to works less with an increased age.”

Also, both the elderly and the chronically ill often spend less time outdoors and cannot get enough sun. People tested with low vitamin D levels tend to be older or more likely to have previous illnesses than people with normal vitamin D levels. Over 60 years of age, a reduction in the synthesis of vitamin D in the skin becomes apparent. This may be the main reason they get sicker with a Sars CoV-2 infection.

“An additional intake of vitamin D is particularly recommended for people with a previous illness or older adults,” said the doctor. Vitamin D levels are often devastatingly low in people in nursing homes. But people in home offices or people who stay longer in closed rooms and rarely go outside can also have an inadequate vitamin D supply.