Comment: Sunshine is free, but ...

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Sunshine is free, but ...

It only produces vitamin D from exposing your skin to it when the sun is high. People who live much north of the Gulf of Mexico can run around naked, but the sun is too low in the sky and the UV-B rays get filtered out by the atmosphere in winter. Sunshine through a pane of glass doesn't work either.
Either vacation way south for four or five months out of the year or supplement.
I take 20,000 IUs per day in winter and 10,000 IUs per day in summer since I spend most of the day in a cubicle. If I feel a cold coming on, I take 50,000 IUs per day for the next three days. That usually kicks it.

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