Vitamin D naturally produced by the sun or a pill?
The sun is the absolute best source of Vitamin D.
Pills are a poor second choice, only for when sunshine is unavailable.
Wonder if the study factored the damaging aspects of rebreathing your own breathe wearing face-masks ?
Sunlight is best, but few of us spend the solid hour daily with sun hitting enough of our exposed skin to get all of the Vitamin D we need. For the rest of us, the vast majority of us, we are left with the pill to make up the difference.
I remember a pill back in the 70s that was called “Sunshine”.
😏
Sun isn’t much good when you have no skin exposed and the sun is low in the sky. Hence the (rough) 34 degrees latitude recommendation.