Sick room, bad smells (cooking, cigarettes) : diffuse with another essential oil (lemon, for example).
Diarrhea dilute in a vegetable oil and massage into the abdomen, or internally by consulting a therapist beforehand.
Laryngitis: dilute in a vegetable oil and massage the arch of the foot, or use by mouth and rectum, consulting a therapist beforehand.
Lack of concentration: by olfaction.
NOTE* In high doses or with repeated application, oregano essential oil is toxic to the liver. It is therefore contraindicated in cases of liver disorders.