Thank you, Mary--really valuable and helpful info...
So, one thing you have to understand is that there is a UVA/UVB spectrum. Titanium dioxide is very good in the UVB spectrum, but just covers a small portion of the UVA spectrum. Regulations in the US allow manufacturers to say it is broad spectrum. This is why you have to be so careful about picking a sunscreen.



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and want to find a good non-chemical sunscreen that I can use all over. I am unsure about overheating related to this, which was part of my question 
