Peter,
Glad you are improving. I am an integrative MD who is aware of conventional wisdom as well as nutritional/natural modes of healing. Ignored by the big money medical system is the foremost role of vitamin D in suppressing inflammation and the severe cytokine storm of serious covid illness. Vitamin D 25 hydroxy blood levels should be maintained over 50 ng/ml for a protective benefit. Most of my patients and I require 5000 IU (125 mcg) of vitamin D3 daily to maintain these levels. If they have not been taking any vitamins, their levels are usually way below 20, posing greatly increased risks for any infection and many cancers. In urgent situations, I advise 20,000 IU daily for 1 week, then maintenance of 5000 IU daily. Vitamin D3 is very cheap, from any vitamin store, OTC from pharmacies. At Costco, a bottle of Nature's Bounty 400 doses of 5000 IU is only about $16 retail, often on sale for $12. For over a year supply, dirt cheap.
I am now 68. In late March 2020 I had a mild covid illness, probably due to my healthy diet, slender body (6 feet, 160 lbs), and excellent vitamin D levels for the past 20 years. Ten months after my mild covid illness, I still had the natural covid antibodies.
