Sinapine is primarily found in cruciferous plants such as mustard and rapeseed, where it functions as a natural antioxidant. It plays a role in protecting plant cells from oxidative stress caused by environmental factors. In research, sinapine has attracted interest for its potential health-promoting properties, particularly its antioxidant activity in biological systems. Studies suggest it may contribute to reducing oxidative damage in cells, which is linked to aging and chronic diseases. Due to its presence in oilseed meals, sinapine is also examined in the context of animal feed, where its effects on digestibility and nutritional value are evaluated. Additionally, it serves as a marker compound in the analysis of seed quality and processing in the food and feed industry.