Ensuring vitamin D is optimal can be beneficial...
"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. Thus, a healthy vitamin D3 status may help prevent viruses and bacteria from gaining a foothold in the body."
https://scitechdaily.com/study-finds-vitamin-d3-important-fo...