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Moumoujus

ETHYLHEXYL METHOXYCINNAMATE.

Valuable CAS 5466-77-3 / LIGHT STABILIZER, UV ABSORBER, UV FILTER

Ethylhexyl Methoxycinnamate, also known as Octinoxate, is an organic chemical UV filter primarily utilized for its ability to absorb UVB radiation. This ingredient safeguards skin from the detrimental effects of sun exposure, effectively preventing sunburn and mitigating photoaging.

Summary

uv absorber uv filter

Science

Mechanism of Action

This UV filter operates by absorbing harmful UVB radiation within the wavelength range of 280-320 nm, demonstrating peak protection at 310 nm. It converts the absorbed light energy into less damaging heat energy, thereby shielding the skin from UV-induced cellular damage.

Research

Clinical Evidence

High confidence
Effective range ≤10%
Optimal

10%

Key findings

  1. 01 The FDA has approved a maximum concentration of 7.5% for UVB protection in sunscreen products within the United States.
  2. 02 The SCCS (European Union) concluded in its June 2025 final opinion that it is safe and effective as a UV filter up to 10% in cosmetic products, including for children.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Ethylhexyl Methoxycinnamate exhibits limited photostability, with potential SPF protection loss of approximately 10% within 35 minutes of sun exposure. For enhanced stability and broad-spectrum UV coverage, it should be co-formulated with photostable UV filters (e.g., Tinosorb S, Octocrylene) and antioxidants. This oily liquid may also experience yellowing upon light exposure.

Synergies

  • Photostable UV filters (e.g., Tinosorb S, Octocrylene)
  • Antioxidants

Conflicts

  • Benzoyl peroxide
  • Low pH Vitamin C

Safety

Safety Profile

CIR Status
Safe as used
Max tested
10%
Sensitization risk Low

This ingredient can be systemically absorbed through the skin, with detection reported in human plasma, urine, and breast milk. While some in vitro and animal studies indicate weak estrogenic and anti-androgenic effects, the SCCS has concluded its safety as a UV filter up to 10% in cosmetics, including for children. However, it is not considered reef-safe and has been banned in certain regions, such as Hawaii and Key West, due to potential adverse environmental impact on marine ecosystems.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Ethylhexyl Methoxycinnamate is a valuable UVB filter, widely approved for its efficacy in sun protection, yet its systemic absorption, potential environmental impact, and photostability concerns necessitate careful formulation and consumer awareness.

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