LOS ANGELES, Sept. 26, 2013 /PRNewswire-iReach/ -- Sunscreens have been in existence for close to 100 years. The aim was to block ultraviolet (UV) light, the harmful rays of the sun. Sunscreens began with pasty zinc oxide that no one would use. Then scientists created sunscreens with clear chemicals that absorbed UV light. In 1944, Coppertone® became the first mass marketed sunscreen. Leap to now, when about a billion dollars' worth of sunscreen are sold each year in the United States.
UV light causes skin cancer, in particular melanoma which is the second most aggressive cancer topped only by pancreatic cancer. UV light also prematurely ages the skin, so it's extremely important to avoid the sun as much as possible or protect the skin with sunscreen.
There are 17 individual sunscreen ingredients that are FDA approved: 15 of these are clear chemicals that absorb UV light and two are made of minerals that reflect UV light. Of these 15, nine are known endocrine disruptors. To be effective, chemical sunscreens need to be rubbed into the skin 20 minutes before sun exposure. They do a pretty good job at blocking UV light, but they actually get used up as the sun shines on them. In fact, some sunscreens lose as much as 90% of their effectiveness in just an hour, so they need to be reapplied often. This is not the case with zinc oxide and titanium dioxide, the two mineral, or physical, sunscreens. These two work very differently – they sit on the surface of the skin and physically block UV light.
Chemical sunscreens don't sit on the surface of the skin – they soak into it and quickly find their way into the bloodstream. They scatter all over the body without being detoxified by the li
|SOURCE DR. Alex Khadavi|
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