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Moumoujus

TITANIUM/TITANIUM DIOXIDE.

Essential / COLORANT, OPACIFYING

Titanium Dioxide is a mineral-derived ingredient primarily recognized as a physical UV filter, creating a protective barrier on the skin. Beyond its robust sunscreen capabilities, it functions as a cosmetic colorant and opacifying agent, also contributing to a mattifying effect through sebum absorption.

Summary

cosmetic colorant opacifying UV absorber UV filter thickening agent sebum absorption

Science

Mechanism of Action

This ingredient forms a physical barrier on the skin's surface, reflecting and scattering ultraviolet B (UVB) and, to a lesser extent, UVA radiation. It is highly photostable, ensuring its protective properties remain intact under sunlight exposure. Additionally, Titanium Dioxide acts as an opacifying agent and cosmetic colorant, while its microporous structure can absorb and disperse sebum, promoting a matte finish on the skin.

Research

Clinical Evidence

High confidence
Effective range 1–25%
Optimal

25%

Key findings

  1. 01 The U.S. FDA has approved Titanium Dioxide as a safe and effective sunscreen active ingredient at concentrations up to 25%.
  2. 02 The SCCS considers nano-Titanium Dioxide safe for use as a UV-filter in sunscreens when applied dermally to intact or compromised skin, at concentrations up to 25%.

Transparency

Dusting Analysis

Commonly dusted
Min. effective
1.4%
Red flag below
25%

While safe for dermal application, the SCCS advises against using nano-titanium dioxide in formulations that may lead to lung exposure (e.g., sprayable products and loose powders) due to potential lung inflammation observed in animal studies. The IARC classifies titanium dioxide as a possible carcinogen (Group 2B) when inhaled. For pigmentary forms, 1.4% is deemed safe in hair styling aerosol sprays, but 25% is not recommended for such applications.

The Formula

Formulation

Solubility
Oil
Optimal pH 5 – 5.8
0 7 14

Stability

Titanium Dioxide is insoluble in water, organic solvents, and inorganic acids, typically requiring dispersion in oil-based formulations. It is photostable, resisting breakdown upon sun exposure. Aggregation is promoted around its isoelectric point at pH 5.8, while optimal structural properties for anatase phase nanoparticles are observed around pH 5.0.

Conflicts

  • Agglomeration or sedimentation if not properly dispersed
  • Reactivity with certain ingredients such as Ascorbyl Palmitate
  • Potential impact on the crystalline form and physical properties of other active ingredients in complex formulations

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
25%
Sensitization risk Low

The FDA considers Titanium Dioxide safe and effective for topical application as a sunscreen active up to 25%. The SCCS similarly regards nano-titanium dioxide as safe for dermal use in sunscreens up to 25%. However, there are significant safety concerns regarding inhalation: the SCCS recommends against its use in sprayable products or powders due to potential lung inflammation from lung exposure, and the IARC classifies inhaled titanium dioxide as a possible carcinogen (Group 2B). The EFSA's decision to ban Titanium Dioxide as a food additive (E171) is specific to oral intake and does not pertain to its dermal use in cosmetics.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Essential

Titanium Dioxide is an essential and highly effective physical UV filter, broadly approved for dermal use in sunscreens and cosmetics with excellent skin compatibility, though careful consideration is required for formulations leading to inhalation exposure.

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