One of the risk factors du jour for coronavirus disease 2019 (COVID-19) has been vitamin D deficiency.
Even Anthony Fauci, MD, has said he takes a vitamin D supplement. Vitamin D “does have an impact on your susceptibility to infection,” Fauci, director of the National Institute of Allergy and Infectious Diseases, told actress Jennifer Garner in a September interview. “I would not mind recommending—and I take it myself—taking vitamin D supplements.”