Ethylhexyl Methoxycinnamate

Ethylhexyl methoxycinnamate (octinoxate) is a UVB filter typically used around 2–7.5% (up to 7.5% in the US), and while it is generally tolerated, clinical and post-market data show it can cause stinging/irritant dermatitis in reactive skin and occasional photoallergic/contact allergy. In eczema-prone or barrier-compromised patients—especially with leave-on, high-application, reapplication patterns—its irritation risk is best classified as mild rather than “gentle,” warranting caution and patch testing when histories of sunscreen sensitivity exist. Safety Notes: Ethylhexyl Methoxycinnamate (Octinoxate) is used at very low levels (~0.05–0.5%) in consumer products to boost UVB coverage and improve SPF synergy in moisturizers, primers, and makeup with incidental SPF. In dedicated leave-on sunscreens and high-SPF daily UV products sold OTC, it is commonly used in the 2–7.5% range and can be found up to the EU maximum allowed level of 10% in some high-SPF formulations; rinse-off products rarely use it and generally sit at the low end when present.