[blam]

"These articles never seem to give the form of Vitamin D used. I assume it was D3."

Yes, Vitamin D3. I buy mine at Costco.

[Veto!]

I get the best one at Amazon:

Garden of Life Olde World Icelandic Cod Liver Oil Liquid - Lemon Mint Flavor - 1,000mg Omega 3 Fish Oil, Fatty Acids, EPA, DHA, Vitamin D & A, CLO Supplements for Heart

Reputedly, Iceland has the cleanest waters. It comes in a glass bottle and I keep it in the fridge to keep it fresh. Take it after freakfast with my other 8 supplements.

I’m 89 and had a cold about eight years ago. My MD said I didn’t need a Covid shot.