Ginger has been shown to reduce the severity and duration of chemotherapy-induced nausea in clinical trials. Additional research suggests ginger may help treat nausea from surgery, pregnancy, and motion sickness, though more research is still needed. Laboratory research also indicates ginger may inhibit the growth of some cancer cells and protect against Alzheimer's, but these effects have not been demonstrated in human clinical trials. Ginger should not be used by those with bleeding disorders or taking blood thinners, as it can inhibit clotting. More research is still needed to determine appropriate dosages and drug interactions when using ginger as an anti-nausea supplement.