Piperlongumine is a naturally occurring alkaloid primarily found in the roots and fruits of Piper longum (long pepper), a plant used in traditional medicine. It belongs to the amide alkaloid class and features a structure with a piperidine ring and an α,β-unsaturated carbonyl system, which contributes to its bioactivity. This compound is renowned for its selective cytotoxicity against cancer cells, achieved by elevating reactive oxygen species (ROS) levels and inducing apoptosis, making it a promising candidate for anticancer therapies. Studies have demonstrated its efficacy against various cancers, including breast, lung, prostate, and pancreatic cancers, often with minimal impact on normal cells. Beyond oncology, piperlongumine exhibits anti-inflammatory, antioxidant, antimicrobial, and neuroprotective properties, potentially due to its ability to modulate pathways like NF-κB and STAT3. It is sparingly soluble in water but more soluble in organic solvents, which affects its bioavailability and formulation in pharmaceutical applications. Research from peer-reviewed sources, such as journals from the American Chemical Society and PubMed, highlights its potential in drug development, though further clinical trials are needed. With a molecular weight of 317.34 g/mol, it is a solid at room temperature and stable under normal conditions, but it may degrade under heat or light exposure.