1–1.5 g/day of dried ginger in divided doses.
Reliably reduces nausea.
View the study (meta-analysis) →Relieves dysmenorrhea, comparable to an anti-inflammatory drug.
View the study (meta-analysis) →⏱ 3 min read
Ginger (Zingiber officinale) is one of the few herbal remedies with clinical efficacy demonstrated by good-quality randomized trials across several distinct indications, all related to its ability to modulate inflammation, the gastrointestinal serotonergic system, and prostaglandin release; its use in cooking and traditional Asian medicine goes back millennia, and modern pharmacology has confirmed that folk wisdom was not far from the biochemical reality.
The most studied active compounds are gingerols (present in fresh ginger) and shogaols (which form when ginger is dried or cooked), a family of phenolic compounds with anti-inflammatory and antiplatelet activity that also modulate serotonergic 5-HT3 receptors in the digestive tract, which explains a good part of the clinical effects on nausea and inflammatory pain.
The clearest evidence for ginger is its antiemetic effect in several clinical contexts: in pregnancy nausea (where it is one of the few safe options for the first trimester), in postoperative nausea, in chemotherapy-induced nausea, and in motion sickness (travel sickness), several meta-analyses have shown significant reductions in the frequency and intensity of nausea with doses of 500 to 1,500 milligrams daily of root extract, normally divided into two to three doses.
In pregnancy, where most pharmacological antiemetics are contraindicated or of very limited use, ginger is one of the few interventions with efficacy comparable to doxylamine-pyridoxine (the commonly prescribed combination) and a very favorable safety profile; typical doses are 250 mg four times a day, ideally with meals to minimize the gastric irritation that some pregnant women report.
Primary dysmenorrhea is another indication with robust evidence: several randomized trials have shown that doses of 750 to 2,000 milligrams daily of ginger during the first three to five days of the menstrual cycle reduce pain comparably to ibuprofen or mefenamic acid, without the gastrointestinal effects of pharmacological anti-inflammatories that many young women tolerate poorly when they use them repeatedly every month.
The mechanism combines inhibition of cyclooxygenase and lipoxygenase (reducing the synthesis of uterine prostaglandins, the main culprits of menstrual pain) with direct effects on uterine contractility; the effect is noticeable from the first cycle of use and tolerance is very good in most young women, making it a reasonable first-line alternative for mild to moderate menstrual pain.
In knee and hip osteoarthritis, several trials have shown modest pain reductions with doses of 500 to 1,000 milligrams daily of extract over weeks, an effect smaller than that of pharmacological anti-inflammatories but safer in the long term in people who need sustained treatment; on systemic inflammatory markers, the effect is modest but measurable in people with chronic low-grade inflammation.
On blood glucose and lipid profile, the data in type 2 diabetes are promising although heterogeneous: some trials show significant improvements in fasting glucose and HbA1c with doses of 1 to 3 grams daily, others find no clear effect, suggesting that the response may depend on the metabolic subtype and on the quality of the product used.
The doses studied range from 250 mg to 3 grams per day depending on the indication: low doses (250-500 mg four times a day) for nausea in pregnancy, intermediate doses (500-1,500 mg/day) for chemotherapy-induced nausea or motion sickness, and high doses (1-2 g/day) for dysmenorrhea or inflammation; ideally taken with meals to minimize gastric irritation, in standardized capsules or as a tea made from freshly grated ginger.
Generally well tolerated; the most common adverse effects are heartburn, regurgitation, and mild diarrhea at high doses; people taking anticoagulants (warfarin, acenocoumarol, antiplatelet drugs) should be cautious because of ginger's theoretical antiplatelet effect, which may increase bleeding; in pregnancy it is safe at standard doses, but exceeding 1 g/day is not recommended, and it is best avoided in the weeks before delivery because of its antiplatelet effect.
Information, not medical advice. Scientific evidence reflects the quality of the studies.