Hey, it's Marco! Okeedoekee, we just don't get enough sunlight on our skin, so we can't make enough vitamin D3. Now, because we don't make enough vitamin D3, we can't store enough calcidiol. Without enough stored calcidiol, we can't produce enough of the active vitamin D (calcitriol).
Most of us live far from the tropics, work indoors and clothe our bodies. High-rise buildings create perpetual shade for city-dwellers. City haze absorbs most of the UV-B. When we travel to work or relax at home, we stay behind glass, leaving all the UV-B outside. Finally when we do venture outdoors, we cover up with sunscreen to protect our skin from sun damage, aging and cancer.
Is it any wonder that we are vitamin D deficient?
Vitamin D3
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