Food nanoparticles (titanium dioxide E171)
Nanoparticulate additive
๐ก Several human studies point the same way, with a plausible biological mechanism, but the evidence is not yet conclusive.
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In brief
titanium dioxide in food: this page reviews Food nanoparticles (titanium dioxide E171) (Nanoparticulate additive) โ documented mechanism, everyday exposure situations and possible alternatives. Level of evidence: Probable.
- Where it's found
- Banned from food in France since 2020 and across the EU since 2022, but still found in illegally imported products (confectionery, industrial pastries); still permitted in some medicines and cosmetics.
- Suspected mechanism
- Nanoparticles (under 100 nm) penetrate the body more easily; animal studies have shown placental crossing, which prompted a precautionary ban โ EFSA (European Food Safety Authority) cannot establish a safe daily dose.
- Suggested alternative
- Check ingredient lists (E171 or titanium dioxide) on products imported from outside the EU; the European ban has greatly reduced exposure since 2022.
- Source
- EFSA 2021; ANSES 2019; INRAE study (Bettini et al., NANOGUT); INRAE ASIRPA 2025.
Frequently asked questions
Food nanoparticles (titanium dioxide E171): how is it linked to infertility?
Nanoparticles (under 100 nm) penetrate the body more easily; animal studies have shown placental crossing, which prompted a precautionary ban โ EFSA (European Food Safety Authority) cannot establish a safe daily dose.
Where is Food nanoparticles (titanium dioxide E171) found in everyday life?
Banned from food in France since 2020 and across the EU since 2022, but still found in illegally imported products (confectionery, industrial pastries); still permitted in some medicines and cosmetics.
How can exposure to Food nanoparticles (titanium dioxide E171) be reduced?
Check ingredient lists (E171 or titanium dioxide) on products imported from outside the EU; the European ban has greatly reduced exposure since 2022.
What is the level of evidence for Food nanoparticles (titanium dioxide E171)?
Probable. Several human studies point the same way, with a plausible biological mechanism, but the evidence is not yet conclusive.
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Related factors
Including a factor does not mean it causes infertility: it is simply worth monitoring, depending on its level of evidence.
Content last updated: September 14, 2026