Last week, I posed Friends of the Earth a challenge – “What is your worst case estimate of the human health risk from titanium dioxide and/or zinc oxide nanoparticles in sunscreens?”  Georgia Miller of FoE Australia and Ian Illuminato of FoE in the US have kindly provided a detailed response.  Rather than just keep this as a comment on the original blog, I thought it deserved a wider airing – and so am posting it here. I will respond to the response in a few days time.  In the meantime, I would be extremely interested in what others think of the use of nanoparticles in sunscreens, based on my original piece and Georgia and Ian’s piece below.  Please do comment – this seems to be an area that desperately needs some good and open discussion.

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