Octisalate is a chemical sunscreen ingredient that helps protect the skin from the sun's ultraviolet (UV) rays. It absorbs UVB rays specifically, which are the main cause of sunburn. Octisalate is often used in combination with other sunscreen ingredients to provide broad-spectrum protection against both UVA and UVB rays. It is a well-tolerated and non-irritating ingredient, making it suitable for sensitive skin types and can be found in many sunscreens, moisturizers, and other skin care products. It also helps to prevent skin aging and other sun-related skin issues.