"We have shown that vitamin D3 appears to stimulate the type I interferon signaling system in the body – a key part of the immune system that provides a first l

"We have shown that vitamin D3 appears to stimulate the type I interferon signaling system in the body – a key part of the immune system that provides a first line of defence against bacteria and viruses." I suggest particularly important for elderly people. https://scitechdaily.com/study-finds-vitamin-d3-important-for-fighting-infections-helps-strengthen-defenses-against-covid-19/ https://scitechdaily.com/study-finds-vitamin-d3-important-fo...