> Unless you live in a northern hemisphere and have darker skin.
Why is this a problem for darker skinned people living in northern hemisphere? Their bodies dont make enough vitamin D even after exposure to the sun?
Why is this a problem for darker skinned people living in northern hemisphere? Their bodies dont make enough vitamin D even after exposure to the sun?
"Vitamin D synthesis is highly dependent on the concentration of melanin in the skin as melanin absorbs and scatters UVR-B, resulting in a less efficient conversion of 7-dehydrocholesterol to previtamin D3[3]. Therefore, dark-skinned individuals will experience slower vitamin D synthesis than light-skinned ones. "
Anecdotal article I found about latitude vs. UV-B exposure: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5037520/
I live at ~60° of northern latitude, and AFAIK people around here commonly don't get enough UV-B exposure for sufficient vitamin D synthesis for half of the year or so, so you need to get it either from nutrition or supplements.