Science
Mechanism of Action
This organic compound functions as a UV filter by absorbing ultraviolet B (UV-B) radiation, specifically within the 280-320 nm spectrum, with its peak protection observed at 310 nm. This absorption mechanism effectively prevents harmful UV-B rays from penetrating the skin, thereby mitigating sunburn and DNA damage. Upon absorbing UV-B light, the molecule enters an excited state, then safely returns to its ground state by releasing the absorbed energy as lower-energy, non-damaging heat. It does not provide protection against UV-A radiation and is typically combined with other UV filters to achieve broad-spectrum efficacy.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Regulatory bodies in the United States and European Union permit maximum concentrations of 7.5% and 10% respectively in ready-for-use products, validating its efficacy for UV-B protection at these levels.
- 02 Formulations incorporating Octyl p-methoxycinnamate (OMC) within liposomal or combined liposome-cyclodextrin delivery systems have demonstrated in vivo SPF values of approximately 11.0-11.6, suggesting enhanced protective capabilities through advanced formulation.
Transparency
Dusting Analysis
This ingredient is typically incorporated into liquid or emulsion systems as an oil-soluble UV filter, not as a powder subject to dusting.
The Formula
Formulation
Stability
DEA-METHOXYCINNAMATE is photounstable, with approximately 10% of its SPF protection diminishing within 35 minutes of sunlight exposure. To ensure sustained efficacy and broad-spectrum coverage, it must be co-formulated with stabilizing UV filters (e.g., Tinosorb S) and antioxidants to mitigate oxidative degradation.
Synergies
- Other UV filters (e.g., Tinosorb S) for enhanced stability and broad-spectrum protection.
- Antioxidants for oxidative stability.
Safety
Safety Profile
DEA-METHOXYCINNAMATE (Octinoxate) is regulated as a UV filter. The EU's SCCS deems it safe for cosmetic use up to 10%, including for children. The US FDA permits a maximum of 7.5% by weight in sunscreens, requiring the label name 'Octinoxate'. While some *in vitro* and animal studies suggest weak estrogenic or anti-androgenic effects and potential thyroid hormone alterations at high doses, these findings are not definitively transferable to typical human exposure conditions. It is generally recognized as non-irritating and non-photosensitizing to the skin.
Your Skin
Skin Compatibility
Our Assessment
Verdict
DEA-METHOXYCINNAMATE is a valuable UV-B filter that effectively protects against sun damage, particularly when integrated into formulations with synergistic ingredients to enhance its stability and provide comprehensive broad-spectrum defense.
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