What it is
Hydroxyapatite is a naturally occurring and synthesizable calcium phosphate mineral supplied as a fine white powder. In sunscreens it can act as a bulking and opacifying agent, help absorb excess sebum or moisture, and improve the feel and finish of the product. It is sometimes used as a porous carrier or to modify the surface and dispersion of pigments and mineral UV filters.
Safety & warnings
Hydroxyapatite is an inert mineral powder with a low potential for irritation or sensitization in topical use. As with other fine powders, the main practical consideration is avoiding inhalation of loose powder during handling.
Origin & sourcing
Cosmetic hydroxyapatite is typically produced synthetically as a calcium phosphate, though the same mineral occurs naturally and is a major component of bone and tooth mineral.
Questions everyone asks
What is hydroxyapatite used for in sunscreen?
It serves as a powdery bulking and opacifying ingredient that can absorb excess oil and improve the product's texture and finish.
Is hydroxyapatite natural?
The mineral occurs naturally and is a major component of bone and teeth, but the cosmetic grade is usually made synthetically as a calcium phosphate.