Oregano oil is a type of essential oil that is extracted from oregano plant. As this oil is made from natural herbs and there is no added preservatives, it is free from side effects. The oil contains powerful antioxidants such as phenols, terpenes and terpenoids. It can be externally applied to skin and inhaled by using steam inhaler. Oregano oil helps to treat asthma, cough, earache, acne, dandruff, ringworm, spider bites, toothache and muscle pain. It can be used as insect repellent and also might improve digestion by increasing bile flow and by fighting with bacteria, fungi and other parasites.