Ajowan essential oil (Ajowan Seed Oil), also called ajwain oil, is acquired with the processes of steam distillation which is done on the seeds of a plant which has the botanical name of Trachyspermum ammi syn. Carum copticum. What is the use of ajwain oil? It possesses anti-fungal, antibacterial, tonic, antiviral, anti-parasitic, antiseptic, and anti-nausea effects. Along with this, it is also used as a treatment for toothaches and whooping cough in India. Ajwain oil is beneficial in the treatment of diarrhea, digestive weakness, skin illness, and gas.