Why take vitamin D supplements when there’s plenty of natural vitamin D available through sunlight?
When exposed to the sun and specifically to UVB rays, our skin synthetizes what we call vitamin D, also called the Sunshine Vitamin. Vitamin D that we get from the sun is not the same vitamin D that is presented in oral supplements. Vitamin D coming from the sun is actually a hormone, synthetized through a quite complex process by our liver and then our kidneys, before it becomes available for use in the body. Pretty much every of our organs needs vitamin D to function optimally, and essentially every tissue and cell in the body has vitamin D receptors.
Vitamin D production from sunlight is well regulated by the body itself. There’s no risk of overdosing in sun-generated vitamin D, although there is a high risk of vitamin D toxicity caused by excessive consumption of vitamin D supplements. Sunlight and foods that contain Vitamin D have no side effects whereas supplements do. On the other hand, adequate sun exposure 2-3 times a week during the "sunny season" (when the UVB's are the strongest) is enough to fill your body needs and avoid vitamin D deficiency.
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