From the early days of the COVID-19 pandemic, researchers examining the question of why some people were better protected from the infection than others began to look at a possible role for vitamin D.

Vitamins are nutrients that are found in the foods we eat. They’re needed for functions such as growth, metabolism, and nervous system activities. Share on Pinterest Anna Denisova/Getty Images Often, ...

You’ve heard about them growing up, you’ve seen them on food packaging, and you’ve read about them in nutrition articles: Vitamins. You've probably heard common phrases like: "Take your vitamins,” ...