[cherry]

I thought he was an excellent speaker....I missed the part about not being able to absorb from the Sun( I think its more like the sun activates vit d????) above the 36th latitude.....

I was surprised to learn that black skinned people really are generally very low in Vit D especially in the upper USA....of all the public service announcements this should be number one.....but alas, there's no money in vitamins...

[Steve Van Doorn]

How we synthesis vitiman D from the sun?
This guy does a nice brake down
https://www.youtube.com/watch?v=eVFICYDjReE

The UVB radiation adds hydrogen to 7-Dehydrocholesterol molecule (cholesterol lacking hydrogen) the liver processes.
If you get the D3 from milk and eggs (usually not enough from foods) they don't need the sun.

One thing I found interesting in this is where does the bacteria (Bacteroides thetaiotamicron) come from to produce the 7-Dehydrocholesterol? our body can't produce it. It seems Thiamine (b1) helps process it.
https://pubmed.ncbi.nlm.nih.gov/28951891/

[MomwithHope]

“I was surprised to learn that black skinned people really are generally very low in Vit D especially in the upper USA....of all the public service announcements this should be number one.....but alas, there’s no money in vitamins...”

Does that mean the sun is racist???