Ginger has long been used as a medicine in Asian, Indian, and Arabic herbal traditions. In China, ginger has been used to aid all types of digestion disorders for more than 2,000 years. Fast forward to modern medicine, and health care professionals still commonly recommend ginger to help prevent or treat nausea and vomiting. It is also ...used as a digestive aid for mild stomach upset. Germany’s Commission E has approved ginger as a treatment for indigestion and motion sickness. Curiously, while most antinausea drugs work on the brain and the inner ear, ginger seems to act directly on the stomach.
For most purposes, the standard dosage of powdered ginger is 1 to 4 g daily, divided into 2 to 4 doses per day. (To prevent motion sickness, you should aim to begin treatment 1 or 2 days before the trip and continue it throughout the period of travel.)