ScienceDietary supplements gain popularity during the pandemic To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScience11/19/2021November 19, 2021Many people are looking to strengthen their immune systems during the pandemic. Some have argued that vitamin D can help fight off COVID-19, but studies don't back this up. And too much vitamin D can even be harmful. https://p.dw.com/p/3vB3BAdvertisement