Like garlic, ginger has long been used in cooking and in medicine. The stem contains substances called gingerols, which give ginger its flavor and odor. Shogaols are another type of active ingredient. Ginger can be used fresh, dried, or as a juice or oil.
(See also Overview of Dietary Supplements.)
Many people take ginger to relieve pregnancy-related nausea and vomiting or motion sickness. Scientific studies suggest ginger is effective for pregnancy-related nausea and postoperative nausea and vomiting, but not for nausea caused by chemotherapy. Ginger powder may help relieve painful menstrual periods not caused by another disorder (primary dysmenorrhea). Ginger may have moderate benefit for osteoarthritis. Some people take ginger to help manage type 2 diabetes.
The following is an English-language resource that may be useful. Please note that THE MANUAL is not responsible for the content of this resource.
National Institutes of Health (NIH), National Center for Complementary and Integrative Health: General information on the use of ginger as a dietary supplement