Across 3 studies, all reported beneficial effects of ginger on reducing vomiting frequency, with effect sizes ranging from small to large. Evidence is strongest for chemotherapy-induced vomiting (doses up to 1 g/day) and for hyperemesis gravidarum in pregnancy. The pooled odds ratios from meta-analyses indicate a significant reduction in vomiting (OR 0.30–0.41).
Effective dose range: up to 1 g/day
Studied populations: patients undergoing chemotherapy; pregnant women with hyperemesis gravidarum
Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed).
Generated Jun 11, 2026
Doses used in studies
g/day: 1 (median 1, IQR 1–1)— 1 study
Safety in these studies
vomitingIncreased riskOR 0.30; 95% CI 0.12 to 0.79; p = 0.02; I2 = 36%
the ginger supplement intake group, which took not more than 1 g of ginger supplementation per day for above four days, had significantly less acute vomiting than the control group (OR 0.30; 95% CI 0.12 to 0.79; p = 0.02; I2 = 36%)
nauseaNo significant differencep = 0.53 (acute), p = 0.31 (delayed)
the incidence of acute nausea (p = 0.53), the incidence of delayed nausea (p = 0.31) ... were not significantly different between the ginger supplement intake group and the control group
vomitingNo significant differencep = 0.09 (acute), p = 0.89 (delayed)
the incidence of acute vomiting (p = 0.09), and the incidence of delayed vomiting (p = 0.89) were not significantly different between the ginger supplement intake group and the control group
the ginger supplement intake group, which took not more than 1 g of ginger supplementation per day for above four days, had significantly less acute vomiting than the control group (OR 0.30; 95% CI 0.12 to 0.79; p = 0.02)
The majority of the MAs found a significant positive effect of ginger on the improvement of nausea in pregnancy compared with placebo, or equivalence to conventional treatments