What it is
Boron nitride is a white, plate-like ceramic powder valued for its silky slip and light-diffusing, soft-focus effect. In sunscreens and tone-up or matte formulas it improves spreadability, blurs the look of pores and fine lines, and helps reduce surface shine. It is an inert filler and does not contribute UV protection on its own.
Safety & warnings
Boron nitride is chemically inert and generally very well tolerated on skin, with no notable allergen or comedogenicity concerns at cosmetic use levels. As with any fine powder, care is reasonable to avoid inhaling loose powder during manufacture or use.
Origin & sourcing
Synthetic; boron nitride is manufactured from boron and nitrogen sources into a fine cosmetic-grade powder.
Questions everyone asks
What does boron nitride do in sunscreen?
It adds silky slip, blurs the look of pores and fine lines, and helps mattify, improving the feel and finish of the product.
Does boron nitride block UV?
No. It is an inert texturizing and soft-focus powder and is not a UV filter.