Which ingredient in sunscreen is known for offering physical protection?

Zinc oxide is recognized as a key ingredient in sunscreens for its ability to provide physical protection against harmful UV rays. Unlike chemical sunscreens, which absorb UV radiation, zinc oxide sits on the skin's surface and acts as a barrier that reflects and scatters both UVA and UVB rays. This physical form of sun protection starts working immediately upon application, making it a popular choice for individuals with sensitive skin or those seeking broad-spectrum protection.

Chemical filters like octinoxate, avobenzone, and oxybenzone, on the other hand, tend to absorb UV radiation and convert it into heat, which can then be released from the skin. While these ingredients can be effective in their own right, they do not offer the same immediate protective qualities as zinc oxide, which is why it stands out as a primary agent for physical protection in sunscreen formulations.