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Sunscreens remain safe, effective form of sun protection, expertssay - Hyundai Car DVD Player

2013-07-10 12:51:37 | 旅行
Unprotected sun exposure is the most preventable risk factor forskin cancer. More than 3.5 million new cases of skin cancer will bediagnosed in the United States this year, affecting 2 millionpeople. At current rates, one in five Americans will develop skincancer in his or her lifetime. Approximately 75 percent of skincancer deaths are from melanoma, and the incidence of melanoma hasbeen rising for at least 30 years.

"Scientific evidence supports the benefits of sunscreen usageto minimize short- and long-term damage to the skin from UVradiation and outweighs any unproven claims of toxicity or humanhealth hazard," said Daniel M. Siegel, MD, FAAD, president ofthe Academy. "To reduce the risk of skin cancer and prematureaging, dermatologists continue to recommend generously applying awater-resistant, broad-spectrum sunscreen -- that protects againstboth types of ultraviolet radiation (UVA and UVB) -- with an SPF 30or higher, in conjunction with other sun-safe practices such aslimiting sun exposure, seeking shade, and wearing sun-protectiveclothing, hats and sunglasses." Sunscreen products contain one or more active drug ingredients --compounds that absorb, scatter or reflect UV light -- and areregulated as over-the-counter (OTC) drugs by the U.S. Food and DrugAdministration (FDA).

The FDA has several safety and effectivenessregulations in place that govern the manufacture and marketing ofall sunscreen products, including safety data on its ingredients.However, recent media reports have questioned the health risks ofsome sunscreen ingredients, specifically oxybenzone and retinylpalmitate, as well as the use of nanotechnology in sunscreen. Oxybenzone provides effective broad-spectrum protection Oxybenzone is one of the few FDA-approved ingredients that provideseffective broad-spectrum protection from UV radiation, and has beenapproved for use since 1978. "Available peer-reviewedscientific literature and regulatory assessments from national andinternational bodies do not support a link between oxybenzone insunscreen and hormonal alterations, or other significant healthissues in humans," stated Dr. Siegel. Toyota Car DVD Player

"The FDA hasapproved oxybenzone in sunscreen for use on children older than sixmonths, and dermatologists continue to encourage protectingchildren by playing in the shade, wearing protective clothing andapplying broad-spectrum sunscreen." Retinyl palmitate helps protect against aging Retinyl palmitate, is a form of vitamin A (retinol), but is not anactive drug ingredient in sunscreen. When used in sunscreen,retinyl palmitate serves cosmetic purposes as an antioxidant toimprove product performance against the aging effects of UVexposure, or to enhance product aesthetic qualities. Despite recentconcerns from in vitro (test tube) studies and one unpublishedreport using mice, "topical and oral retinoids are widelyprescribed to treat a number of skin diseases, such as acne andpsoriasis, and there is no published evidence to suggest eitherincrease the risk of skin cancer in these patients," said Dr.Siegel. "In fact, oral retinoids are used to prevent skincancers in high-risk patients such as those who have undergoneorgan transplantation." Dr. Hyundai Car DVD Player

Siegel also added that"unlike more potent prescription forms of vitamin A, there isno evidence to suggest that use of sunscreen with retinyl palmitateposes comparable risks." Nanotechnology enhances broad-spectrum protection The broad-spectrum sunscreen active ingredients titanium dioxideand zinc oxide leave a white residue on the skin followingapplication when used in a larger particle form. However, whenthese active ingredients are converted into nanoparticles --smaller, lighter molecules -- they appear to vanish on the skin, donot leave a residue, and retain and enhance their ability to blockUVA and UVB light. "While widespread use of nanotechnology in medicine iscurrently under evaluation, one of the main benefits ofnanoparticles in sunscreens is that the small molecules can providemore protection and more even coverage on the skin's surface thanlarger particles," said Dr. Siegel. "Considerableresearch on the use of nanoparticles on healthy, undamaged skin hasshown that the stratum corneum -- the outermost layer of the skin-- is an effective barrier to preventing the entry of nanoparticlesinto the deeper layers of the skin. Kia Car DVD

Titanium dioxide and zinc oxidehave a long history of safe use in sunscreens and offer goodoptions for broad-spectrum UV protection." Get vitamin D safely There has also been concern that sunscreen use prevents thesynthesis of vitamin D by the skin. Vitamin D is an essentialnutrient that is vital for strong bones and a healthy immunesystem. The Academy recommends that an adequate amount of vitamin Dshould be safely obtained from a healthy diet that includes foodsnaturally rich in vitamin D (e.g., dairy products and fish),foods/beverages fortified with vitamin D (e.g., fortified milk andfortified cereals), and/or vitamin D supplements -- and not from UVexposure. The Academy recently updated its position statement onvitamin D based on the published review of the increasing body ofscientific literature on this vitamin conducted by the NationalAcademy of Sciences Institute of Medicine (IOM).

"Unprotected UV exposure to the sun or indoor tanning devicesis a known risk factor for the development of skin cancer. Sincesun exposure is responsible for vitamin D production in the skin,wearing sunscreen can decrease the skin's production of vitamin D,but alternative and safer options are available to obtain yourvitamin D," states Dr. Siegel. "Individuals who properlyand consistently wear sunscreen or use other UV protectivemeasures, and are concerned about their vitamin D, should discussobtaining sufficient vitamin D from foods and/or vitaminsupplements with their doctor." FDA sunscreen regulations will be helpful Last June, the FDA announced new sunscreen regulations whichclearly define the testing required to make a broad-spectrumprotection claim in a sunscreen and indicate which types ofsunscreen can reduce skin cancer risk. "We look forward to theimplementation of these regulations which will help Americansreduce their risk for skin cancer by guiding them to the mosteffective sunscreens and advising them about other sun-protectionmeasures," said Dr.

Siegel. Sunscreen just one sun protection tool "Despite any concerns over the use of sunscreen, they are animportant component of a daily protection plan, as dermatologistsunderstand that the public may not be willing to wear protectiveclothing and minimize sun exposure. There are many sunscreenproducts available that meet the Academy's recommendations, andconsumers need to be comfortable with their choice of product inorder to use it routinely," Dr. Siegel added.

"Sinceallergic and other reactions can occur, individuals should read theproduct's labeling carefully, use as directed, and seek the adviceof their dermatologist in using sunscreens and any product appliedto the skin. The American Academy of Dermatology will continue tomonitor scientific evidence related to sunscreen ingredients andtheir effectiveness to help guide patients and the public.".

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