Diethylhexyl Butamido Triazone

Irritancy: unknownComedogenicity: unknownUV Absorber

The details

Diethylhexyl Butamido Triazone (aka Iscotrizinol) is an oil-soluble organic UV filter that mainly absorbs UVB and a bit of UVA II light. This ingredient is great at preventing sunburn but doesn't cover the deep UVA I range. This is why it's often paired with a UVA filter like Avobenzone or Bemotrizinol . Two of its biggest selling points are efficiency and stability: Most of the other chemical filters are considered "photostable" if they can last for two hours. Because this ingredient is oil-loving, it can sit neatly into the oil phase of emulsions and shines in water-repellent/water-resistant formulations. The EU and Canada allow it to be used up to 10% and Japan allows it up to 5%. Unfortunately, it's not yet an FDA approved sunscreen agent so you won't be able to find it in sunscreens in the US. Safety-wise, it has a pretty solid record: the EU's Scientific Committee on Consumer Safety (SCCS) has reviewed it and found low skin absorption, no capacity to produce skin irritation or photo-irritation. In vitro testing has found less than 0.1% of the applied dose is absorbed by the skin over 24 hours (mostly due to its large molecule size). Fun fact: This ingredient even has anti-inflammatory properties similar to those of ketoprofe, an anti-inflammatory medication.