Ethylhexyl Methoxycinnamate, also known as Octyl Methoxycinnamate or Octinoxate, is a widely used organic, oil-soluble sun filter that absorbs UV-B radiation. It is commonly found in sunscreens and cosmetics to provide sun protection and protect against UV damage. It is generally considered safe for use in skincare products, with minimal skin irritation. However, concerns have been raised about its potential for hormone disruption, skin absorption, and environmental toxicity.
Barely leads to skin irritation. Reduces the appearance of scars.
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Cinnamate allergy is diagnosed by performing patch tests with 1% cinnamate in petrolatum.
People with allergy to balsam of Peru and related cinnamon-type compounds should avoid sunscreens containing cinnamates.
Cinnamates are chemically related to cinnamon oil and other cinnamon-related compounds that are used widely as flavourings and fragrances in many toiletries and cosmetics.
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Unacceptable
Ethylhexyl Methoxycinnamate is approved for use in sun care preparations in many countries worldwide, with a maximum concentration of 7.5% in America and 10% in Europe. It is often used in combination with other sunscreen ingredients, such as AakoSun BP3 or AakoSun TiO2, to provide broad-spectrum sun protection. Cinnamates are also potent UVB absorbers and therefore used in sunscreen agents and colour cosmetics with sun-protection factor qualities. Octyl methoxycinnamate is the most widely used UVB blocking agent used in the skincare industry. When exposed to sunlight, octyl methoxycinnamate is converted into a less UV absorbent form which means that its effectiveness is reduced over time. This breakdown can be partly prevented by the addition of certain other photostabilisers, particularly bemotrizinol. The combination with other chemicals makes a more water-resistant and stable product. Octocrylene (2-ethylhexyl-2-ciano-3, 3-diphenyl acrylate), a relatively new cinnamate that has both UVB and some UVA absorbing properties is photostable and thought to be non-allergenic and non-irritating. Its widespread use in sunscreen and cosmetic products has led to an increase in octocrylene sensitisation so that it is now a prime photoallergen of chemical-absorbing sunscreens. In addition to allergic-type reactions, concerns have been raised about the relative ease of which octyl methoxycinnamate is absorbed into the skin and may promote the generation of potentially harmful free radicals. What this means in terms of the use of cinnamates in skincare products long term is unknown, hence further research is warranted. Octinoxate is shown to have hormone-mimicking effects on laboratory animals. This chemical is found in humans, including mothers' milk samples.
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