One of the most effective broad-spectrum UV absorbers: covers the entire UVA1, UVA2, and UVB range. Extremely photostable (doesn’t break down under sun) and often used to stabilize other filters like Avobenzone. By filtering out UV, it helps prevent sunburn, wrinkles, and hyperpigmentation. Widely used in modern sunscreens globally (not yet in US) for long-lasting high SPF protection