Rutin (CAS 153-18-4), commonly known as Vitamin P, is a natural bioflavonoid widely found in plants such as buckwheat, pagoda tree buds, and citrus fruits. It is renowned for its exceptional ability to enhance capillary toughness and reduce vascular permeability, often used as a vasoprotective agent. Additionally, it functions as a powerful antioxidant, helping to scavenge free radicals, promote vitamin C absorption, and exert anti-inflammatory effects. As a result, rutin is extensively applied in pharmaceuticals, health products, and skincare products.