Zinc oxide works like a microscopic mirror.

It reflects and scatters UV radiation rather than absorbing it like chemical sunscreens.

Zinc oxide is a mineral sunscreen. It sits on top of your skin and physically blocks UV rays from penetrating. Think of it as a layer of tiny mirrors that bounce the light away. That’s why it’s often called a “physical” or “mineral” sunscreen.

Chemical sunscreens absorb UV radiation, convert it to heat, and then release it. That process can degrade the sunscreen over time. Zinc doesn’t do that. It just sits there and reflects. That’s also why it’s more stable and generally considered safer — no chemical absorption into the skin.

It also covers both UVA and UVB, so you don’t need a separate ingredient for broad-spectrum protection. The trade-off is the white cast, but modern micronized formulas have gotten better.

That’s why dermatologists love it. It’s simple, stable, and effective.