Ecamsule
INCI: Terephthalylidene Dicamphor Sulfonic Acid
Reviewed by Daisy · Last updated 18 Aug 2026
Also known as: Terephthalylidene Dicamphor Sulfonic Acid, Mexoryl SX
Photostable UVA filter Technical name is terephthalylidene dicamphor sulfonic acid
EWG Safety Score
What Is Ecamsule?
Ecamsule is a sunscreen ingredient that provides broad-spectrum UVA protection. Its technical name is terephthalylidene dicamphor sulfonic acid. Ecamsule is a photostable, organic UVA filter, meaning it does not break down significantly when exposed to sunlight, maintaining its efficacy. It is a benzylidene camphor derivative, known for its strong absorption of short UVA rays, which helps prevent photoageing and sun damage. It is often used in combination with other UV filters to provide comprehensive sun protection.
Clinical Evidence & References
- Matta, M. K., Zusterzeel, R., Pilli, N. R., Patel, V., Volpe, D. A., Florian, J., & Oh, S. S. (2019). Effect of sunscreen application under maximal use conditions on plasma concentration of sunscreen active ingredients: a randomized clinical trial. Jama, 321(21), 2082-2091
- DeLeo, V. A., Clark, S., Fowler, J., Poncet, M., & Loesche, C. (2009). A new ecamsule-containing SPF 40 sunscreen cream for the prevention of polymorphous light eruption: a double-blind, randomized, controlled study in maximized outdoor conditions. Cutis, 84(3), 153-159
- Ecamsule - an overview. ScienceDirect Topics.
Published Research
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Ecamsule (Mexoryl SX): UVA protection efficacy J Am Acad Dermatol, 2006
Frequently Asked Questions
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