The vitamin D created by your body from sunlight has been shown to last longer than supplemental. As we age the bodies ability to manufacture vitamin D from sunshine wanes, if indeed you get enough sun.
The vaxx screwed up my body chemistry but the blood tests I had to undergo established the supplements I needed (D & Fe).
Most older people require a D supplement.
thanks for the info
“The vitamin D created by your body from sunlight has been shown to last longer than supplemental.”
Vitamin D is released slowly from the skin into the blood over several days. Oral is digested immediately but is fat-soluable and can be stored and released over weeks.
I’m 79 and been taking Vitamin D for years. I never got Covid and can’t remember the last time I had a cold.