Dec 3, 2020
"About 20 minutes of daily sunshine on 40% of exposed skin produces ample vitamin D in general, but such estimates are gross generalities."
That's an understatement. You comment on the effects of skin color but don't even mention season or latitude. A person sunbathing in Miami, Florida on June 21 is going to get a LOT more vitamin D produced than a person hardy enough to stand naked for 20 minutes in Edmonton, Alberta (or even Seattle, Washington.
Get Michael Ham’s stories in your inbox
Join Medium for free to get updates from this writer.
Supplementation during winter, especially at latitudes remote from the equator, is essential.
