What it is
Cerium oxide is a cerium-based inorganic oxide that occurs as a fine, pale powder. In cosmetic formulas it can be used to add opacity, modify texture, and help with the look and finish of mineral-based products. In tone-up and mineral sunscreens it may contribute to the powdery feel and appearance of the formula.
Spectrum coverage
Regional approval · max %
Safety & warnings
As used in cosmetics it is an inert mineral powder. As with other fine powders, care is taken to avoid inhalation during manufacturing, but in finished leave-on products it is not associated with fragrance allergy or significant skin irritation.
Origin & sourcing
It is an inorganic mineral material derived from cerium, a rare-earth element, and is processed into a refined cosmetic-grade powder.
Questions everyone asks
Is cerium oxide a UV filter?
No. In these formulas it functions as an inorganic opacifying and texturizing powder rather than as an approved UV filter.
What does cerium oxide add to a mineral sunscreen?
It can contribute opacity and a smooth, powdery finish, helping shape the texture and appearance of mineral or tone-up formulas.