While most of us are aware that direct sunlight exposed to bare skin synthesizes the production of vitamin D in the body, many are not aware however, that during the winter months, we simply cannot produce much Vitamin D at all regardless of sun exposure.
Researchers have found that the production of previtamin D3 in your skin varies depending on several factors, which include skin type, weather conditions, and sunscreen use.
During the winter at latitudes above 35 degrees, there is minimal previtamin D3 production in the skin. Darker skin pigmentation, application of sunscreen, aging and clothing can also have a dramatic effect on previtamin D3 production.
However, at the other end of the scale, excessive exposure to sunlight does not result in vitamin D overdose, because previtamin D3 and vitamin D3 are photolyzed to biologically inert chemicals before they can build up to dangerous levels.
Most of the United States and ALL of Canada and Europe are above the 35 degree latitude and therefore it's crucial that everyone supplement with vitamin D throughout the winter and spring.
Keep your D levels at optimal levels and stay healthy this winter.
Current Vitamin D Council recommendation guidelines suggest 5,000 I.U's per day for most individuals.
I personally take 6-10,000. And remember to test your D levels periodically and make adjustments accordingly.
http://www.vitaminDcouncil.org/
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