Sixty-seven women, all no more than 17 weeks pregnant and with at least one incident of nausea during pregnancy, were assigned to either a placebo group or a ginger group. Women in the ginger group received a total of one gram of ginger per day, in the form of a 250-mg capsule taken three times daily after meals and once before bedtime, for four days. Women in the placebo group received identical-looking capsules at the same intervals. Both groups were asked to consume frequent small meals rich in carbohydrates but low in fat, and to not take any other medications.
At baseline, the women were asked to grade the severity of their nausea in the past 24 hours on a scale of 0-10, 10 being worst, as well as any instances of vomiting The women were asked to continue recording the severity of nausea twice daily the course of the study, and to document any episodes of vomiting at the end of each day. At a follow-up visit one week later, women from both groups were asked to rate any change in the severity of their symptoms to assess their response to treatment.