80% of sunscreens are useless or harmful, says EWG Mother Nature Network Environmental Working Group 2015 Guide to Sunscreens 217 Sunscreens which were OK See also VitaminDWiki Ways to block UVA but not the UVB which makes vitamin D Sunscreen in a pill (with low SPF) Melanoma huge increase - perhaps due to use of sunscreen or lower vitamin D - Aug 2014 - free book UV spectra of the sun and sunscreens