Nano TiO2 Safety in Cosmetics
Nano TiO2 in cosmetics is extensively reviewed and approved for use in non-spray products. Sprays are restricted due to inhalation risk.
The safety of nano TiO2 in cosmetics has been the subject of extensive regulatory review, particularly through the EU Scientific Committee on Consumer Safety (SCCS) and equivalent bodies in the US (FDA) and Australia (TGA).
EU SCCS opinions (key milestones): - 2014 (SCCS/1516/13): nano TiO2 with proper surface coating, used in non-spray sunscreen up to 25%, is safe - 2018 (SCCS/1583/17): inhalable nano TiO2 (in sprays, loose powders, sprayable products) is potentially hazardous - 2020 (SCCS/1611/19): updated review of nano TiO2 in spray products — concluded unsafe for inhalation route
These opinions form the basis of EU Cosmetic Regulation Annex VI listing for TiO2: - Approved as nano UV filter in sunscreen up to 25% - Specific coating requirements (silica, dimethicone, etc.) - Spray applications excluded
FDA position (US): - TiO2 approved as Category I sunscreen active ingredient - No specific nano labeling required - No spray restriction (although industry practice mirrors EU concerns) - Maximum concentration 25% in sunscreen
Australia TGA: - Nano TiO2 in sunscreen approved - TGA periodically reviews; current position aligns with EU SCCS
The science underlying safety conclusions:
Skin penetration: Multiple in vitro and in vivo studies (Filipe et al. 2009, Schilling et al. 2010, Newman et al. 2009) show: - Nano TiO2 with proper surface coating does NOT penetrate beyond the stratum corneum (outer skin layer) - TiO2 remains on the skin surface during use, washes off completely
This is the foundation for the safety conclusion in non-spray sunscreen use.
Inhalation: Spray sunscreens containing nano TiO2 are problematic because: - Aerosolized nano particles can reach deep lung alveoli - Animal studies (Heinrich et al. 1995, Borm et al. 2004) show pulmonary inflammation from chronic TiO2 inhalation - Some studies suggest carcinogenic potential at high inhaled doses
The 2022 EU classification of TiO2 as Carc. 2 (inhalation) reflects this concern (see related knowledge entry).
Photocatalysis on skin: A potential concern with nano TiO2 is photocatalytic generation of reactive oxygen species (ROS) on skin under UV exposure. Modern surface coatings (silica + organosilane) reduce photocatalysis by >95% (EFSA methylene blue method), addressing this concern.
SEMITI NANO-30 specifications: - Primary particle size: 15–30 nm (TEM measured) - Surface coating: silica (10–15%) + organosilane (5–10%) - Photocatalytic activity: < 5% of uncoated TiO2 (verified by EFSA methylene blue assay) - Heavy metals: Pb ≤ 2 ppm, As ≤ 1 ppm, Cd ≤ 0.5 ppm, Hg ≤ 0.5 ppm - Microbiology: TPC < 100 CFU/g, no pathogens
This specification meets EU Cosmetic Regulation requirements and equivalent regulations in US, Australia, ASEAN.
Approved applications: - Sunscreen lotions, creams, sticks, balms (non-spray) - BB creams, CC creams - Tinted moisturizers - Foundation - Daily wear products with SPF claim - Lip products with SPF claim
Restricted / not recommended applications: - Spray sunscreens (lung exposure) - Loose face powders containing nano TiO2 (inhalation during application) - Aerosol cosmetics
Documentation for cosmetic formulators: - Nano material safety dossier - Surface coating composition certificate - Photocatalytic activity test report - Heavy metal and microbiology analysis - Cosmetic regulatory compliance (EU, US, ASEAN, China NMPA, Korea MFDS)
For formulators developing reef-safe / mineral / physical sunscreens, SEMITI NANO-30 provides the regulatory-compliant nano TiO2 for all major global markets.