Proanthocyanidins are a class of flavonoids found in various plants, known for their antioxidant properties. They are commonly present in foods like grapes, berries, and apples, as well as in beverages such as red wine and tea. These compounds help protect cells from damage caused by free radicals and may contribute to overall health. Research suggests that proanthocyanidins may support cardiovascular health by improving blood circulation and reducing inflammation. They are also studied for their potential benefits in managing conditions like diabetes and allergies. However, more research is needed to fully understand their effects on human health.