3-Propylidenephthalide is a naturally occurring compound found in plants such as celery (Apium graveolens), responsible for its characteristic celery-like aroma and flavor. It is primarily used in the fragrance and flavor industry, incorporated into perfumes, cosmetics, food, and beverage products to impart a unique celery-like sensory profile. As a specialty chemical, it serves as an intermediate in organic synthesis for producing more complex structures. Additionally, it is researched for bioactive properties, including antimicrobial, antioxidant, and anti-inflammatory effects, positioning it as a potential ingredient in pharmaceuticals, natural health products, and cosmeceuticals. Current applications in bioactive uses remain in the research and development stage to ensure safety and efficacy.