What is a notable characteristic of zinc oxide in cosmetics?

Zinc oxide is recognized for its ability to absorb ultraviolet (UV) radiation, making it a popular ingredient in sunscreens and other cosmetic products designed to provide sun protection. One notable characteristic is that while it effectively absorbs harmful UV rays, it does not penetrate the skin. This means that it forms a physical barrier on the skin's surface, which helps to reflect and disperse these rays rather than being absorbed, thus enhancing its safety and efficacy in sun protection. This combination of UV protection and non-absorption into the skin contributes to its frequent use in formulations targeting sun damage and skin health.