Diethylhexyl Butamido Triazone

Diethylhexyl Butamido Triazone is an oil-soluble UVB filter used in sunscreens typically around a few percent, designed to be photostable and to remain largely on the skin surface due to its high molecular weight, which limits penetration. Human repeat-insult patch testing and post-market experience generally show a low rate of irritation or sensitization, but sunscreen filters can still sting or irritate very reactive or barrier-impaired skin in real-world use (especially when layered with other actives). Given its overall favorable tolerability but non-zero risk in compromised skin, it warrants a very gentle (not inert) score. Safety Notes: Diethylhexyl Butamido Triazone (a lipophilic UVB filter, often sold as Uvasorb HEB) appears at very low levels (~0.1–1%) in daily moisturizers/BB products and lower-SPF sunscreens where it is used to boost UVB protection and photostability in combination with other filters. In high-SPF leave-on sunscreens, the top of the observed consumer market is typically around 5–10%, with 10% aligning with the EU maximum permitted concentration for this filter; rinse-off products rarely use it and generally sit at the low end when present.