Vitamin D Levels and Cutaneous Production

Factor #1: Use of Sunscreen: In order for the skin to make vitamin D, it is necessary that the skin gets UVB rays from sunlight. Because of this, sunscreens that block UVB radiation also inhibit your skin from manufacturing vitamin D. This is an extremely important factor to keep in mind, especially because sunscreen protects us from the sun’s damaging effects, including premature skin aging and skin cancer.

Factor #2: Skin Color: The melanin content of the skin also largely determines how well the dermal tissues can make vitamin D from the sun’s rays. The darker the skin color, the more difficult it is for your skin to produce Calcitriol. This is because melanin functions as a natural sunscreen that filters out UVB radiation, which is mandatory for vitamin D creation.

Factor #3: Your Weight: Calcitriol is a vitamin soluble in fat and oils, which means it gets stored in your body fat. The more body fat you have accumulated, the more vitamin D is deposited in the fat stores, which means less vitamin D makes its way into your circulation, this is called decreased bioavailability. Vitamin D deficiency is strongly correlated with obesity and many scientific studies have shown that there is reduced bioavailability of vitamin D in obese people.

Factor #4: Age: Age also reduces the skin’s natural ability to cutaneously synthesize vitamin D from the rays of the sun. Scientific studies have revealed that a 70 year old individual manufactures 4x less vitamin D from the sun than a twenty year old. Recognition of this difference is very important for the elderly who may spend an insignificant amount of time in the sunshine, and solely depend on exposure to the sun for meeting their vitamin D needs.

Although our bodies are capable of producing plenty of vitamin D from the sun under the right conditions, the aforementioned factors influence the efficiency of vitamin D synthesis by our dermal tissues. It is important to understand that vitamin D taken up through food sources is not influenced by any of these limiting factors. The Food and Drug Administration’s listed daily requirement of vitamin D is only 400IU, however, several studies contest this dosage and seem to indicate a need for a higher daily intake. The National Institute of Medicine has taken this in to account and recommends 2,000IU a day for healthy adults. Due to the fat-solubility of vitamin D, amounts higher than 10,000 IU every day may be toxic unless prescribed by a medical doctorwho has checked your circulating Vitamin D levels.

If you enjoyed this informative article please also take a look here: vitamin d health and vitamin d deficiency and diabetes.

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