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Titanium dioxide (TiO 2 ) has for decades been approved for use in sunscreens as a physical sunblock. It is not known whether reducing the size of TiO 2 particles in sunscreens creates new issues of safety and/or effectiveness. A study was therefore conducted to investigate the relative risk of skin penetration by TiO 2 nanoparticles in healthy fairskinned individuals.
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Coelho et al. (2016) studied this question.
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