Ozone therapy consists of the introduction of ozone into the body via various methods, usually involving mixing of the ozone with various gases and liquids and injecting this into the body, including the vagina, rectum, intramuscular (in a muscle) or subcutaneously (under the skin). Ozone can also be introduced via autohemotherapy, in which blood is drawn from the patient, exposed to ozone and re-injected into the patient.