Chemical Free Sun Screens Raise ConcernsUntitled

Chemical Free Sunscreens containing nano-scale ingredients raise potential concerns. Micronized and nano-scale zinc oxide and titanium dioxide are present in many of the available "chemical free" sunscreens. While skin absorption of these products has not been a problem, studies of other nano-scale materials have raised concerns about the toxic effects of these agents on the lungs from powder and spray sunscreens. (pneumonia due to titanium nanoparticles. Cheng TH, Ko FC,Chang JL,Wu KA,Ann Thorac Surg (2012 Feb) 93(2):666-9.)