Ajwain or Ajowan Oil is a purely herbal medication for cough and cold. It acts by removing the mucus from the airways, suppressing cough, and relieving chest congestion. A well-known antispasmodic and analgesic, ajwain oil has been used as a folk remedy in India and other parts of Asia for centuries. It is used to increase appetite and relieve stomach pain, bloating, flat Arabs used it for their horses. It's been a key ingredient in curry, and the Taliban banned it in Afghanistan. But a new study says that this spice may help to save millions from serious illness