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A comment on The Big Vitamin D Mistake (2017). Parent comment

Re:The Big Vitamin D Mistake (2017) by User23 on Tuesday October 13, 2020 @04:11PM (#24769785)
Clouds are translucent to the UV light needed for vitamin D synthesis. Even so the days get pretty short up north.

Also you haven’t mentioned your skin tone. Persons with darker skin will obviously have a harder time synthesizing vitamin D from sunlight. Fortunately the PNW is rich in salmon, one of the few good natural dietary sources of vitamin D, which certainly helped earlier peoples to maintain their health.

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Re:The Big Vitamin D Mistake (2017) by mikenew on Tuesday October 13, 2020 @04:20PM (#24769891)
I'd say I'm about an #FFCD94 or so.

I've also started adding more salmon into my diet. A 100g serving seems to be about 500 IU of vitamin D. Apparently fat helps with absorption of vitamin D, so it seems like a good way to get it. Still, not sure it would be enough, and I'm not willing to forego the supplement this winter to see where I'd end up.

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