In Canada D3 is a recommended supplement, from second hand sources.

D is not recommended here unless you dont drink milk, which is fortified with D3.

My son developed bone issues acvording to one ortho... which put me on the trail of vit D3, K 2 and the many minerals that make up bone.

At our 5000 summer and 10,000 winter dosing, I expect it will help control covid and other issues.