Diagram of vitamin D production. We can see that sunrays are involved from the beginning of the reaction
Frontiers skin vitamin
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"Black people ignore that their ancestors, who adjusted to the material conditions of the Nile valley, are the oldest guides of humankind on the way to civilisation".
"Black people ignore that their ancestors, who adjusted to the material conditions of the Nile valley, are the oldest guides of humankind on the way to civilisation".