Vitamin D absorption and metabolism

As with other fat soluble vitamins, fat in the intestine is necessary for vitamin D absorption. Vitamin D from food and supplements is absorbed through the intestinal walls and can be stored in the fat cells of the liver, skin, brain and bones in amounts sufficient for many months' consumption.
Exposure to sunlight in spring, summer and autumn usually makes up for any shortfall in dietary vitamin D and even brief exposure to sunlight during these times is adequate. There may, however, be problems in winter months in some climates.
Vitamin D absorption The production of vitamin D in the body is blocked by anything which blocks ultraviolet light including skin pigment, smog, fog, sunscreen, windows and hats.

 

 
 
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