The health care system looks for magic guns while missing the obvious.

The study was of high doses. Low doses seem to working as well.

Vitamin D is a steroid that regulates bone growth, the immune system and blood clotting. People with poor immune systems have bad reactions to COVID19.

The dose does not have to be huge. We can get free vitamin D if we just exposed our skin to direct sunlight at noon for a few minutes.

The UVB rays from the sun (these are strongest at noon) converts cholesterol in the skin into Vitamin D3. Our kidneys convert vitamin D3 to D2.

So, a person who gets some direct sun (about 15 minutes) and has a functioning kidney is likely to have the right amount of Vitamin D.

NOTE: free fructose molecules in the kidney destroy vitamin D. High Fructose Corn Syrup, Invert Sugar, Agava nectar and a few other sources have free fructose molecules.