I first paid attention to Vitamin D 18-20 years ago. I can’t recall the presenter, but he compared Vit D to the iron rods in a nuclear reactor. I don’t know if you’re old enough to remember the videos shown in the 60s& 70s of a room filled with ping pong balls on mouse traps. Another ball is tossed in the room and it explodes a moment or so later with all the balls flying all over—that’s how a nuclear explosion was explained. The room was reloaded, this time with panels that represented the iron rods in a reactor, and this time the “explosion” was controlled. So D3 is like the rods to prevent the cytokine storm and allows the immune system to react in a controlled manner.