Ginger (Zingiber officinale)
In short
Summary of findings for quick reference
Ginger (Zingiber officinale) is a tropical rhizome with one of the broadest and deepest tradition records of any healing plant. It is one of the most cited single drugs in classical Ayurveda, where it earned the honorific the universal medicine, and it appears in the earliest Chinese materia medica as dried ginger. From its South Asian home it travelled west along the spice routes: the Greek physician Dioscorides and the Roman Pliny both recorded it as a warming digestive imported from Arabia, and it later entered the Greco-Arabic, Unani and Japanese Kampo traditions. Across all of them the same use comes up again and again: a warming root for nausea and digestion.
That convergence is reflected in the modern monographs, and ginger holds an unusually strong regulatory standing for a botanical. The EU herbal monograph gives ginger root a dual status: a well-established-use indication for the prevention of nausea and vomiting in motion sickness, plus traditional-use indications for the symptomatic relief of motion sickness, mild spasmodic digestive complaints with bloating and flatulence, temporary loss of appetite, minor joint pain, and symptoms of the common cold. The German Commission E approved ginger root in 1990 for dyspepsia and motion sickness, and ESCOP lists it for the same core uses. The well-established-use part is the stronger category and is more than long tradition alone.
The clinical evidence is strongest for nausea. Systematic reviews report a small to moderate benefit for nausea outcomes, including pregnancy nausea, from about 1000 to 1500 mg per day of standardised ginger extract. For other uses the picture is more modest: ginger produces a small reduction in osteoarthritis pain and accelerates gastric emptying in mechanistic studies, but the clinical-outcome trials are smaller and less consistent, and the EU monograph has not extended its well-established standing to them. The pregnancy-nausea use is best framed as traditional and discussed with a midwife or doctor. Ginger is best understood as a well-tolerated kitchen and medicine root with deep historical roots and genuinely strong nausea evidence, used in culinary and supplementary amounts rather than as a clinical treatment.
Clinical evidence ↔ Historical significanceWe display two separate evidence categories: clinical evidence from modern trials and historical significance from documented healing tradition. Both are valuable, but they answer different questions.Read more
In every encyclopedia entry we evaluate two distinct categories of evidence. Clinical evidence as used in trials meets a narrower but scientifically essential bar. At the same time, the hundreds of thousands of plant species worldwide have only partially been captured and tested in modern studies.
Alongside the trial picture our researchers compile a comprehensive overview of where and since when a plant has been used across different traditions of natural medicine. When a plant has been used as a medicinal plant in many cultures across many generations, that historical significance deserves to be visible too.
Our position: a truly informative overview emerges only when both categories sit side by side. We communicate transparently what counts as what.
Overview
Ginger (Zingiber officinale) is a tropical rhizome used as both a culinary spice and a botanical medicine across most of Asia for at least two and a half millennia. The pungent active compounds, gingerols in fresh root, shogaols formed when ginger is dried or heated, are the basis for both its flavour and its pharmacological effects.
The European Medicines Agency Committee on Herbal Medicinal Products (HMPC) has issued a monograph supporting traditional use of dried ginger root for relief of symptoms of motion sickness and as a digestive aid. The clinical-research evidence is strongest for nausea-related outcomes.
History
Ginger appears in Chinese herbal canon as early as the Shennong Bencao Jing (c. 100 CE) and in Ayurvedic texts under the Sanskrit name shringavera ("horn-shaped root"). Both traditions used it for nausea, digestive cold, and respiratory complaints. Greek and Roman physicians knew it as imported via the spice route; Pliny the Elder described it in his Natural History in the first century CE.
Ginger was so valued by medieval European apothecaries that it appeared in price-fixed pharmacy tariffs from at least the 13th century. Today it is recognised as one of a small number of botanicals whose traditional digestive and anti-nausea uses have been confirmed by modern randomised controlled trials.
Mechanism
The main pharmacologically active constituents are gingerols (6-, 8-, 10-gingerol) and their thermally-derived dehydration products, the shogaols. Both classes interact with 5-HT3 serotonin receptors in the gut and the chemoreceptor trigger zone, the same target as ondansetron, which underlies the anti-nausea effect.
Gingerols also inhibit COX-2 and 5-LOX, producing mild anti-inflammatory effects, and modulate substance P signalling. At high doses they have anti-platelet activity comparable to aspirin in vitro, which is the mechanistic basis for the warfarin interaction discussed in the safety section.
For nausea outcomes, the evidence base is unusually strong for a botanical. A 2014 systematic review by Marx et al. of pregnancy-associated nausea, a 2020 meta-analysis of chemotherapy-induced nausea (Crichton et al.), and Cochrane reviews of post-operative nausea consistently report a small-to-moderate benefit of 1000 to 1500 mg/day of standardised ginger extract.
For osteoarthritis pain, the evidence is more modest. Bartels et al. (2015, Osteoarthritis and Cartilage) meta-analysed RCTs and found ginger extracts produced a small reduction in pain scores compared with placebo, with a safety profile better than NSAIDs but with smaller effect size. The EMA HMPCEuropean Medicines Agency, Committee on Herbal Medicinal Products (HMPC) has not extended its monograph to this indication.
For digestive symptoms more broadly, bloating, dyspepsia, gastric motility, the evidence is suggestive but smaller-scale. Ginger accelerates gastric emptying in healthy volunteers and patients with functional dyspepsia in mechanistic trials, but clinical-outcome studies are smaller and less consistent.
Evidence
| Outcome | Class | Grade | Effect | Studies |
|---|---|---|---|---|
| Nausea reduction (pregnancy)Systematic reviews of pregnancy nausea report reduced nausea severity vs placebo (Viljoen 2014, 12 RCTs, n=1278). Framing per EMA HMPC traditional use. | EmergingEmerging research. Early small trials suggest an effect but await replication. | IEvidence quality grade I (Insufficient). Not enough evidence to draw a conclusion. More research needed. This is an evidence rating, not a product endorsement. | Systematic reviews of pregnancy nausea report reduced nausea severity vs placebo (Viljoen 2014, 12 RCTs, n=1278). Framing per EMA HMPC traditional use. | |
| Pain reduction (osteoarthritis)Moderate effect size for OA pain reduction (SMD -0.30) | EmergingEmerging research. Early small trials suggest an effect but await replication. | IEvidence quality grade I (Insufficient). Not enough evidence to draw a conclusion. More research needed. This is an evidence rating, not a product endorsement. | Moderate effect size for OA pain reduction (SMD -0.30) | |
| Delayed onset muscle soreness reduction25% reduction in DOMS with 2g/day raw ginger | EmergingEmerging research. Early small trials suggest an effect but await replication. | IEvidence quality grade I (Insufficient). Not enough evidence to draw a conclusion. More research needed. This is an evidence rating, not a product endorsement. | 25% reduction in DOMS with 2g/day raw ginger | |
| Gastric motility enhancementAccelerated gastric emptying by ~25% in functional dyspepsia | EmergingEmerging research. Early small trials suggest an effect but await replication. | IEvidence quality grade I (Insufficient). Not enough evidence to draw a conclusion. More research needed. This is an evidence rating, not a product endorsement. | Accelerated gastric emptying by ~25% in functional dyspepsia |
Usage
Forms and preparation
Ginger comes in many forms, fresh rhizome, dried powder, capsules of standardised extract, tea bags, syrups, and crystallised pieces. For nausea outcomes the studied formats are 250 mg capsules of standardised extract (4 to 6 capsules/day) and fresh ginger root tea (1 to 2 g grated root in hot water). Fresh ginger is highest in gingerols; drying converts a fraction to shogaols which retain pharmacological activity.
Dosage by outcome
| Outcome | Dose | Form | Duration | Population |
|---|---|---|---|---|
| Pregnancy nausea (first trimester) | 750 to 1000 mg/day, 3 to 4 times daily, with food | Standardised dried-root extract capsule | 4 weeks | |
| Motion sickness prevention | 500 to 1000 mg, Single dose 30 to 60 min before travel | Dried root capsule or 2 to 4 g fresh root tea | ||
| Mild dyspepsia / digestive comfort | 1000 to 2000 mg/day, After meals | Fresh root tea or dried-root capsule | 4 weeks |
For nausea-related outcomes, clinical trials have used 1000 to 1500 mg of standardised dried ginger root extract per day, divided into 2 to 4 doses. Acute culinary use of 2 to 4 g of fresh root per day is well-tolerated by most adults. Therapeutic-dose use above 1500 mg/day for longer than 4 weeks has limited safety data and is best supervised.
Safety
Interactions
| Substance | Severity | Mechanism | Recommendation |
|---|---|---|---|
| Warfarin and other coumarin anticoagulants | Medium | Gingerols inhibit thromboxane synthesis, producing additive anti-platelet effect on top of warfarin's anticoagulation. | Discuss with prescribing physician. Monitor INR more frequently if starting therapeutic-dose ginger. |
| Direct oral anticoagulants (apixaban, rivaroxaban) | Medium | Theoretical additive anti-platelet / anticoagulant effect; few clinical reports. | Keep ginger to culinary doses unless cleared by prescribing physician. |
| NSAIDs (additional GI risk) | Low | Both can irritate gastric mucosa at high doses. | Take ginger with food. Limit therapeutic-dose ginger while on chronic NSAID therapy. |
Drug interactions
The most important interaction is with anticoagulants, warfarin in particular, but also direct oral anticoagulants. At high doses, ginger has mild anti-platelet activity that can additively increase bleeding risk. Case reports exist of elevated INR with warfarin + therapeutic-dose ginger. Coordinate with prescribing physician.
Contraindications
Avoid therapeutic-dose ginger if you have an active gallstone problem (ginger increases bile flow, which can be painful with obstructed stones), an active peptic ulcer, or a known bleeding disorder. Culinary amounts are generally fine in these situations but discuss with your physician.
Side effects
| Effect | Frequency | Severity | Notes |
|---|---|---|---|
| Heartburn / mild reflux | Common | Mild | Dose-related. Take with food. |
| Gastric burning sensation | Uncommon | Mild | More common with extract capsules on empty stomach. |
| Allergic contact dermatitis | Rare | Mild | From fresh root in handlers / kitchen workers. |
Most common are mild gastric irritation and heartburn, usually dose-related and easily controlled by taking ginger with food. Allergic contact dermatitis from fresh ginger is reported in handlers.
Look-alikes
FAQs
How much ginger should I take for nausea?
Clinical trials examining nausea outcomes (pregnancy, motion sickness, post-operative, chemotherapy) have typically used 1000 to 1500 mg of standardised ginger root extract per day, split across 2 to 4 doses. Fresh ginger tea (1 to 2 g of grated root steeped in hot water) is a reasonable equivalent for milder cases.
Is ginger safe during pregnancy?
Multiple randomised controlled trials have used up to 1000 mg of ginger daily in the first trimester for morning sickness without finding adverse pregnancy outcomes. Most medical guidelines consider ginger acceptable in moderate culinary or supplementation doses, but doses above 1500 mg per day should be discussed with a midwife or doctor.
Does ginger thin the blood?
Ginger has mild anti-platelet effects in vitro, and case reports describe interactions with anticoagulants like warfarin at high doses. In healthy people consuming culinary amounts, this is not clinically significant. If you are on warfarin, apixaban, or other anticoagulants, talk to your doctor before adding therapeutic-dose ginger supplements.
Fresh ginger, dried powder, or capsules, which is best?
Fresh ginger has the highest gingerol content (the main anti-inflammatory compound) but also varies most in potency. Dried powder concentrates by mass but converts some gingerol to shogaol, which has a different but still active pharmacology. Standardised capsules give the most consistent dosing for therapeutic use. For everyday digestive support, fresh tea works well.
5 sources.
- Viljoen et al.. Viljoen et al. 2014. 2014. PMID:24642205
- Ryan et al.. Ryan et al. 2012. 2012. PMID:21818642
- Bartels et al.. Bartels et al. 2015. 2015. PMID:25091459
- Black et al.. Black et al. 2010. 2010. PMID:20418184
- Wu et al.. Wu et al. 2008. 2008. PMID:18403946
Legal notice: The depiction of historical significance and traditional use is context within our encyclopedia and not a health claim for any product, not a treatment promise, and not a substitute for medical advice. What may be stated on product labels, product pages, or in advertising is governed by the applicable legal requirements.