Polyphenolic compounds are natural substances found in plants, known for their antioxidant properties. They play a crucial role in protecting plants from UV radiation and pathogens. Common sources of polyphenols include fruits, vegetables, tea, and red wine, contributing to their health benefits. These compounds are categorized into flavonoids, phenolic acids, and other polyphenols. Research suggests that polyphenolic compounds may help reduce the risk of chronic diseases, such as heart disease and cancer, by combating oxidative stress and inflammation in the body. Their potential health benefits have made them a focus of nutritional studies and dietary recommendations.