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When your skin is exposed to Sunlight, it makes vitamin D from cholesterol. Ultraviolet B rays hit cholesterol in the skin cells, providing the energy for vitamin D synthesis to occur.
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https://www.healthline.com/nutrition/vitamin-d-from-sun
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Vitamin D has many roles in the body and is essential for optimal health. Apr 28, 2018

"ESSENTIAL"!
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That's very bad for us undead.


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