Science
Mechanism of Action
It functions as a broad-spectrum chemical filter that targets UVB and UVA II wavelengths, specifically peaking near 288 nm and 352 nm. Upon exposure, the molecule absorbs UV photons, transitioning to an excited state before safely converting that energy into harmless thermal vibration as it returns to its ground state, thereby shielding cellular DNA from photo-damage.
Research
Clinical Evidence
Medium confidence3%
Key findings
- 01 Validated by regulatory bodies as an effective concentration for achieving broad-spectrum protection against short-wave UVA and UVB radiation.
- 02 Standardized patch testing indicated potential for localized irritation over a 72-hour period, though systemic safety profiles remain generally favorable.
Transparency
Dusting Analysis
Because it is an active sunscreen agent regulated by the FDA, it is rarely 'dusted' in sun-care products; however, in secondary products like hair care or fragrances, it may be used at very low levels (below 0.5%) solely to protect the product color rather than the user's skin.
The Formula
Formulation
Stability
Highly resilient to heat and UV exposure. It exhibits a bell-shaped stability curve, performing optimally in neutral to slightly alkaline environments while degrading in highly acidic conditions.
Synergies
- Polymeric film-formers to limit skin penetration
Conflicts
- Aqueous chlorine (swimming pools)
- Strong oxidizing agents
- Highly acidic formulations
Safety
Safety Profile
While CIR reaffirmed its safety in 2021, the FDA currently classifies it as Category III (insufficient data for GRASE status) pending further research into its systemic absorption through the skin barrier.
Your Skin
Skin Compatibility
Our Assessment
Verdict
An effective but aging UV filter that is increasingly being replaced by modern alternatives due to regulatory scrutiny and potential for mild irritation.
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