When taken at the first sign of symptoms, Oregano-8s synergistic blend of 8 powerful immune boosters, is fast and effective for fighting symptoms of colds and flu. It contains 40 mg of oil of oregano, known for its strong anti-microbial and anti-bacterial properties. The power of oil of oregano is multiplied through the combination of garlic, goldenseal, elderberry, vitamin C, zinc, cayenne and grape seed extract.