Ethylhexyl Triazone – UV Filter in Sunscreens
Ethylhexyl Triazone is a synthetic chemical UV filter used in sunscreen products to protect the skin from harmful UV-B radiation.
Things worth knowing about "Ethylhexyl Triazone"
Ethylhexyl Triazone is a synthetic chemical UV filter used in sunscreen products to protect the skin from harmful UV-B radiation.
What is Ethylhexyl Triazone?
Ethylhexyl Triazone (also known as Octyl Triazone or EHT) is a synthetic organic UV filter primarily used in sunscreens and cosmetic products. It belongs to the group of chemical photoprotective agents and is approved as a sunscreen ingredient in the European Union. Ethylhexyl Triazone absorbs UV-B radiation in the wavelength range of approximately 290 to 320 nanometers, preventing this radiation from penetrating the skin and causing cellular damage.
Mechanism of Action
Ethylhexyl Triazone functions as a UV-B absorber. Its molecular structure allows it to absorb UV-B photons and dissipate their energy as heat, rather than transmitting them to skin cells. This protects the DNA of skin cells from direct UV-induced damage that can lead to sunburn, premature skin aging, and an increased risk of skin cancer over time. A key characteristic of Ethylhexyl Triazone is its high photostability, meaning it degrades minimally upon UV exposure and maintains its protective efficacy over extended periods.
Applications and Occurrence
Ethylhexyl Triazone is commonly found in the following products:
- Sunscreen creams, lotions, and sprays
- Daily moisturizers with SPF (Sun Protection Factor)
- Makeup products with sun protection functionality
- After-sun care products
Within the EU, Ethylhexyl Triazone is listed in the Cosmetics Regulation (EC) No. 1223/2009 as an approved UV filter, permitted in sunscreen formulations at concentrations of up to 5%. It is frequently combined with other UV filters to achieve broader spectral coverage (UV-A and UV-B) and to enhance the overall sun protection factor.
Safety and Tolerability
Based on current scientific evidence, Ethylhexyl Triazone is considered safe and well tolerated. Unlike some other chemical UV filters, it demonstrates low skin penetration, meaning it is unlikely to reach deeper skin layers or enter systemic circulation. Allergic reactions are rare but can occur in isolated cases. Individuals with known sensitivity to chemical UV filters should carefully review product labels. To date, there is no evidence of endocrine-disrupting properties, which have been a concern for certain other UV filter substances.
Comparison with Other UV Filters
UV filters are broadly classified into two categories:
- Chemical (organic) filters such as Ethylhexyl Triazone: These absorb UV radiation and convert it into heat energy.
- Physical (mineral) filters such as titanium dioxide or zinc oxide: These reflect and scatter UV radiation.
Compared to other chemical UV-B filters, Ethylhexyl Triazone stands out for its exceptionally high photostability and high molar extinction coefficient, meaning it absorbs UV-B radiation with great efficiency.
Environmental and Sustainability Considerations
Like many chemical UV filters, Ethylhexyl Triazone is being studied for its potential impact on aquatic ecosystems. Current research suggests it has a lower ecotoxicological potential at relevant concentrations compared to some other chemical filters such as oxybenzone. Nevertheless, it is advisable to choose environmentally conscious sunscreen formulations when swimming in natural bodies of water.
References
- Regulation (EC) No. 1223/2009 of the European Parliament and of the Council on cosmetic products. European Commission, Annex VI (List of UV filters allowed in cosmetic products).
- Shaath, N. A. (Ed.): Ultraviolet Filters. Cosmetics and Toiletries, 2009. Allured Publishing Corporation.
- Mancebo, S. E., Hu, J. Y., Wang, S. Q.: Sunscreens: A Review of Health Benefits, Regulations, and Controversies. Dermatologic Clinics, 2014; 32(3): 427-438.
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