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“Unlike some other chemicals used in food, titanium dioxide has no nutritive, preservative, or food safety function—its use is purely cosmetic,” said CSPI principal scientist for additives and supplements, Thomas Galligan. “The prospect of titanium dioxide nanoparticles damaging DNA is concerning enough for us to recommend consumers avoid foods that have it.” 

Fig. 3. Cell survival measured on samples of MSSA with bare and functionalized P25TiO₂NPs after 6 h of irradiation. A: P25TiO₂NPs, B:vitaminB2@P25TiO₂NPs, C: vitaminC@P25TiO₂NPs in concentrations of 0.2 μg/mL (red) and 0.2 mg/mL (blue). p <0.05.