Ginseng is an herbal supplement. Ginseng contains active elements called ginsenosides. The roots are used to make medicine. It contains antioxidants and anti-inflammatory qualities. Ginseng may strengthen the immune system, improve brain function, fight fatigue, use to treat different types of cancer and improve signs of erectile dysfunction. Other uses involve the treatment of anemia, swine flu, prediabetes and diabetes, inflammation of the stomach lining (gastritis), fever, and asthma.