Vitamin D And Skin Care

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Vitamin D And Skin Care

The media-emphasized main conflict surrounding this vitamin (which is actually a hormone, not a vitamin) revolves around sun exposure and whether or not using sunscreen hinders our bodies’ ability to manufacture vitamin D. Vitamin D deficiency can be a serious health problem and sunlight can be the most abundant, natural way for our bodies to create it. But can our bodies utilize the sun to create vitamin D if we regularly use sunscreen? The answer is a resounding yes. Despite news stories to the contrary, several large, controlled studies have shown that vitamin D deficiency does not result from ongoing regular sunscreen use. Aside from sun exposure, vitamin D supplementation is still a good idea because even with sun exposure we can still be deficient. (Sources: The Journal of the American Osteopathic Association, August 2003, pages 3-4; American Journal of Clinical Dermatology, March 2002, pages 185-191; Dermatology, January 2001, pages 27-30; and British Medical Journal, October 1999, page 1066).

You may be wondering what other roles vitamin D plays in maintaining healthy skin. Skin cells, along with the cells of our other major organs, have receptor sites for vitamin D. These sites allow the conversion of vitamin D (via sun exposure) to its active form. Thus far, the most substantiated information pertaining to vitamin D and skin involves its role as a potential treatment for psoriasis and its involvement in the prevention of skin cancers.

If you suffer from psoriasis, you should know that the active form of vitamin D, 1,25-dihydroxyvitamin D3 (also known as calcitriol) can help control the proliferation of skin cells that lead to psoriatic lesions and modulate the immune system’s hyper-response to this disorder. Various topical prescription treatments using vitamin D derivatives are available, but making sure you consume enough vitamin D via diet or supplementation plays a role, too. Vitamin D deficiency, which is actually quite common, can lead to problems with cell growth and differentiation throughout the body, including skin. Some researchers are working to prove that long-term vitamin D deficiency leads to skin malignancies (skin cancer). The protective effects of topically-applied vitamin D analogues (chemical compounds similar to the vitamin D our skin naturally produces in the presence of sunlight) have been demonstrated in-vivo (on a live subject), though studies have been conducted on mouse, rather than human, skin. Understandably, researchers believe that further exploration into how topically-applied vitamin D may protect skin cells from the DNA damage that leads to cancer is worthwhile. In the future, it is possible that sunscreen recommendations will be accompanied by new vitamin D dietary guidelines to ensure proper levels are achieved.

It’s hard to imagine that a vitamin could find itself in the midst of a controversy, but that is exactly the position vitamin D is in. The conflict is over risking sun exposure because of our bodies’ need for vitamin D. Vitamin D deficiency can be a serious health problem, most notably by blocking the absorption of calcium and phosphorus, causing a chronic imbalance and bone deterioration. As luck would have it, sunlight is the most abundant, natural source that helps our bodies make vitamin D.

You may be unaware that, despite the name, vitamin D is not actually a vitamin. It is a hormone known as calcitrol. When your skin is exposed to UVB light, it converts 7-dehydrocholesterol (present in your skin and bloodstream) into vitamin D, where the liver and kidneys activate it and it begins regulating and enhancing the absorption of the minerals calcium and phosphorus in the body. Since there are very few foods that naturally contain vitamin D (your best options are salmon, mackerel, and cod liver oil) most of us need to rely on either sun exposure or vitamin D-fortified foods (such as milk and cereals) to ensure we get enough.

Where the controversy takes place is that exposing our skin to the sun without sunscreen is dangerous, but there are those that believe sunscreen will cancel out the body's ability to manufacture vitamin D from sun exposure. This concern has been expressed from several seemingly reputable resources and Archives of Dermatology, December 1988, pages 1802-1804).

On the other side of this argument are proponents for sun avoidance (myself included) who encourage maintaining adequate levels of vitamin D through dietary sources and supplements without skimping on the sunscreen because sunscreen does not block the amount of UVB radiation needed to help the body manufacture vitamin D.

An article reprinted in PCI Journal (Volume 12, Number 4, November 2004) refers to comments by dermatologist Darrell S. Rigel, M.D., clinical professor, New York University Medical Center in New York City. He reports that as someone who sees and treats skin cancer patients on a daily basis, it is appalling to him that anyone in good conscience would claim that intentional sun exposure, regardless of length of time, is beneficial. It is a fact that skin cancer rates are rising and solid science supports the daily application of sunscreen as the best defense against the damaging effects of sunlight. The same article also mentioned a 1997 study published in the Journal of the National Cancer Institute. It concerned patients with xeroderma pigmentosa (a disease that causes multiple skin cancers in persons exposed to even small amounts of UV radiation). The study demonstrated that these patients, despite avid sun avoidance and constant UV protection, still had normal levels of vitamin D over a period of several years. There is also the issue that no sunscreen, regardless of active ingredients or how often or liberally it is applied, can provide 100% protection from UV radiation. The tiny amount of UVB light that sunscreens do not shield is enough to begin the synthesis of vitamin D (though depending on your skin color and climate, supplemental vitamin D will likely still be necessary).

Further, several large, controlled studies have shown that vitamin D deficiency does not result from ongoing regular sunscreen use. Vitamin D supplementation is a good idea because most people’s diets are naturally deficient in it, not to mention as we age our bodies’ ability to produce vitamin D naturally diminishes due to the decrease in 7-dehydrocholesterol (a component in skin that begins the conversion process for vitamin D). (Sources: The Journal of the American Osteopathic Association, Volume 103, Number 8, August 2003, pages 3-4; American Journal of Clinical Dermatology, March 2002, pages 185-191; Dermatology, January 2001, pages 27-30; British Medical Journal, October 1999, page 1066). Before beginning any new vitamin supplement program, make sure to consult your physician.

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