Bo
Boron Nitride
Boron Nitride
A powder made of boron and nitrogen that adds slip.
What it does
It’s a powder made of boron and nitrogen. The EU lists it to add slip and bulk to a formula.
The evidence, graded
expert consensusUS safety reviewers (2015) say boron nitride is used in cosmetics as a slip modifier, which helps products glide on. It’s used at up to 25%, in eye shadow. At 50% it caused minimal irritation; at 18.7% it didn’t cause allergy, and it isn’t expected to pass the skin’s outer layer. An eye shadow with 13% caused no problems in a two-week use test. They judged it safe as used.Fiume 2015 · International Journal of Toxicology ↗
Graded per the methodology: strong · moderate · emerging · expert consensus. A weak source on a strong claim gets the weaker label.
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