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This may of course be related to the fact that sunscreen is used in areas of high UV penetration. Despite these studies, no medical expert except myself has issued recommendations to be somewhat cautious in the excessive use of sunblock. There are also many synthetic compounds in sunscreens associated with adverse health effects.
Remember, when you have too much sun your skin will tell you...it begins to burn!
In 2007 two studies by the CDC highlighted concerns about the sunscreen chemical oxybenzone (benzophenone-3). The first detected the chemicals in greater than 95% of 2000 Americans tested, while the second found that mothers with high levels of oxybenzone in their bodies were more likely to give birth to underweight baby girls. Some concerns have been raised regarding the use of nanoparticles in sunscreen, which theoretically could increase rates of certain cancers, or diseases similar to those caused by asbestos
However, my main concern is the use the use of sunscreen also interferes with vitamin D production. This chemical is protective against both heart attack and cancer and there is growing evidence sun may be the real cause of cardio-protection and not the mediterranean diet. There was a Vit D deficiency in Australia after a government campaign to increase sunscreen use. in fact, I would recommend spending small amounts of time in the sun without sun protection to ensure adequate production of vitamin D.