From "The Truth about SPF Index & Sun Protection" at http://www.prnewswire.com/news-releases/the-truth-about-spf-index--sun-protection-119179429.html
"Almost 99% of the vitamin D we make comes from sun exposure. With the overuse of SPF, Americans are becoming more vitamin D deprived, resulting in an increased risk of cancer, heart disease, and PMS symptoms. In addition to the deprivation of vitamins, this over-exposure to the sun-protecting chemicals creates a "plastic bag" effect which suffocates the skin." - BIONOVA cosmetics press release
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