I just read an item that says that most Vitamin D absorption happens through the eyelids. Now that everyone wears sunglasses all the time in the sun, that may explain why we have so many Vitamin D deficiencies and related illnesses. They suggested sitting outside with your eyes closed, eyelids towards the sun, and have a moment of gratitude.
Since the second way to get Vitamin D is through the skin, constant sunscreen use is probably not good either!
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