Materia Medica
Ginger
Zingiber officinale — Rhizoma · Zingiberaceae
Educational content only. This monograph is not medical advice and is not a substitute for care from a qualified practitioner. Do not stop or change a prescribed medication based on anything you read here. If you are pregnant, nursing, or taking medication, especially a blood thinner, talk with your doctor or a clinical herbalist before using ginger in medicinal amounts.
Key Takeaways
- Fresh and dried ginger are two different medicines from one plant. Drying converts mild gingerols into hotter shogaols, which is why dried ginger burns deeper and fresh ginger works more at the surface.
- Nausea is the most studied use. Randomized trials reported reduced nausea and vomiting in pregnancy, and the traditional record covers motion sickness and upset stomach across every major system.
- In one comparison trial, participants taking 1 gram of ginger powder daily reported pain relief similar to those taking mefenamic acid or ibuprofen. The trial had no placebo group, so read it as promising rather than settled.
- The blood-thinning question is unresolved. Laboratory work shows platelet effects, the strongest human trial found none, and a few case reports suggest an interaction with anticoagulant drugs. The caution stands if you take those medications.
- German Commission E lists pregnancy as a contraindication, while multiple trials since reported reduced nausea at 1 gram daily with no detected harm. Both positions are shown below so you can see the disagreement.
What Ginger Is and Where It Comes From
Ginger is the rhizome of Zingiber officinale, a tropical perennial in the same family as turmeric and cardamom. A rhizome is an underground stem rather than a true root, and it stores the plant's aromatic oils and pungent resins. The plant's original wild home is unknown, though it is presumed to be southern Asia, and it has been cultivated so long that it no longer sets viable seed. Growers propagate it entirely by dividing the rhizome.1 India, Nigeria, and China lead production today.
Fresh vs. Dried: One Plant, Two Medicines
Drying does more than remove water. Heat and drying convert gingerols, the main pungent compounds of the fresh rhizome, into shogaols, which are sharper and more heating. Every major tradition noticed the difference long before the chemistry was known, and several gave the two forms separate names and separate jobs.
- Fresh ginger is warming, opens the pores, and pushes circulation toward the skin. Traditions reach for it at the first chill of a cold, and for nausea and cramping.
- Dried ginger is hotter and works deeper in the core. It is the traditional choice for chronic cold digestion and poor central circulation.45
Energetics
Ginger is pungent, warming to hot, and drying. Fresh ginger is diaphoretic, meaning it promotes sweating and moves heat outward to the surface, which is why ginger tea at the first sign of a chill is a near-universal folk practice. Dried ginger concentrates its heat in the digestive core. Ayurveda adds one unusual detail: unlike most pungent herbs, ginger has a sweet post-digestive effect, which makes it gentler on the tissues over time than its heat would suggest.4 In traditional terms, ginger suits cold, damp, sluggish states and aggravates hot, inflamed, acidic ones.
Traditional Uses of Ginger
Western Herbalism and the Eclectics
The Eclectic physicians of the 1800s used ginger constantly, both as a medicine and as a carrier that softened harsher drugs. King's American Dispensatory records it as a stimulant, carminative, and sialagogue (an herb that increases saliva flow) with these core uses:1
- Flatulence, atonic dyspepsia, and cramping pains of the stomach and bowels
- Diarrhea and cholera-type illness, combined with astringents, when the surface and limbs are cold
- Ginger tea for breaking up colds and easing painful menstruation
- Externally as a warming plaster for headache and a poultice ingredient for slow-healing ulcers
Their specific indications describe one consistent pattern of cold, weak digestion: loss of appetite, gas, gurgling, spasmodic cramps, cool extremities.1 David Hoffmann carries the same picture into modern Western practice and calls ginger among the best-known herbs for motion sickness.3
Ayurveda: Adrakh and Sunthi
Ayurveda calls ginger the universal medicine and uses fresh and dried forms deliberately. Sebastian Pole describes fresh ginger (adrakh) as the choice for peripheral circulation, nausea, menstrual cramps, and wet coughs with clear or white mucus, while dried ginger (sunthi) kindles agni, the digestive fire, and clears deep-seated cold.4 Dried ginger is one third of Trikatu, the classical digestive formula it shares with black pepper and long pepper. If you have read the black pepper monograph, this is the same formula mentioned there.
Traditional Chinese Medicine: Sheng Jiang and Gan Jiang
Chinese medicine treats the two forms as separate herbs with separate entries.5
- Sheng Jiang, the fresh rhizome, releases the exterior, disperses cold, warms the middle, stops vomiting, and resolves thin phlegm. It appears in cold-and-flu formulas and is a classic antidote herb for seafood reactions.
- Gan Jiang, the dried rhizome, warms the middle and rescues collapsed yang. It is reserved for deeper, more chronic interior cold with weak digestion and cold limbs.
Constituents and What Extracts Them
Which preparation you choose matters, because the active compounds do not all dissolve in the same things. The pungent principles sit in an oleoresin, a thick resin-and-oil fraction that alcohol and fats pull well and water pulls only partially.1
| Constituent group | Notes | Dissolves best in |
|---|---|---|
| Volatile oil (1 to 3 percent) | Sesquiterpenes including zingiberene and beta-bisabolene; carries the aroma and part of the carminative action | Alcohol; escapes with steam, so cover your pot |
| Oleoresin (4 to 10 percent): gingerols | Main pungent compounds of fresh ginger; studied for anti-nausea and anti-inflammatory activity | Alcohol and fats; hot water extracts a useful portion |
| Oleoresin: shogaols | Formed from gingerols during drying and heating; hotter and more stimulating | Alcohol and fats |
| Starch and polysaccharides | Up to half the dried weight; bulk and mild demulcent character | Water |
What the Research Shows
Ginger is one of the most-trialed herbs in the world. Each study card below names the preparation, the design, and the weak points, so you can weigh the claim yourself.
Nausea and vomiting in pregnancy
- Preparation
- Dried ginger powder in capsules, 1 g per day for 4 days.
- Design
- 70 pregnant women at or before 17 weeks, randomized and double-masked against an identical placebo. Nausea scores and vomiting episodes both dropped more in the ginger group, and 28 of 32 ginger takers improved versus 10 of 35 on placebo. No harm to pregnancy outcomes was detected (Vutyavanich et al., Obstetrics and Gynecology, 2001).6
- Weak points
- Small, short, single hospital, and the powder was not standardized. Later trials and systematic reviews point the same direction, which raises confidence, though data on rare fetal outcomes remain limited across the whole literature.
Menstrual pain, head to head with two drugs
- Preparation
- Dried ginger rhizome powder, 250 mg capsules four times daily for the first 3 days of the period, compared against mefenamic acid and ibuprofen on the same schedule.
- Design
- 150 university students with primary dysmenorrhea, double-blind, three equal groups. Pain relief and satisfaction were statistically similar across all three groups (Ozgoli et al., Journal of Alternative and Complementary Medicine, 2009).7
- Weak points
- No placebo arm, so all three treatments could in theory be riding the same expectation effect. Participants were assigned by alternation rather than a random sequence, follow-up covered a single cycle, and pain was self-reported on a verbal scale. A later randomized trial reached a similar conclusion against mefenamic acid, which helps, but the evidence tier stays moderate.
Does ginger thin the blood?
- Preparation
- A commercial ginger tablet equivalent to roughly 0.4 g of rhizome powder daily, taken for 7 days before and 7 days after a single 25 mg dose of warfarin.
- Design
- Open-label, randomized, three-way crossover in 12 healthy men. Ginger changed nothing: INR (a lab measure of how long blood takes to clot), platelet aggregation, and warfarin blood levels all held steady (Jiang et al., British Journal of Clinical Pharmacology, 2005).8
- Weak points
- Healthy volunteers rather than patients, a low ginger dose, a single warfarin dose, and no blinding. Set against it: laboratory studies showing ginger inhibits thromboxane synthetase, an enzyme involved in platelet clumping, and a small number of case reports of raised INR in anticoagulated patients using ginger products. A 2015 systematic review judged the human platelet evidence mixed and inconclusive.9 The disagreement is why the medication caution below stays in place.
The wide-angle view
- Preparation
- Everything from fresh rhizome to powders to standardized extracts, at doses from under 1 g to several grams daily.
- Design
- A 2020 review in Nutrients gathered 109 randomized controlled trials of ginger in humans. The most consistent signals were for nausea and vomiting, digestive function, and modest improvements in blood lipid and glucose markers (Anh et al., Nutrients, 2020).10
- Weak points
- The trials used wildly different preparations, doses, and durations, and many were small. A review this broad shows which uses have the most trial activity behind them. It cannot prove that any single protocol works.
Dosing: Multiple Perspectives
Dosing in herbalism is a perspective, not a single number. The ranges below describe how named sources have used ginger. They are not a recommendation for you. Work with your healthcare provider or a clinical herbalist to decide what fits your situation, especially if you take medication.
| Source | Preparation | Dose |
|---|---|---|
| King's American Dispensatory, Felter and Lloyd, 18981 | Powdered rhizome; infusion of 1 ounce root per pint of boiling water | 10 to 30 grains of powder (roughly 0.65 to 2 g); 1 to 2 fluid ounces of the infusion |
| German Commission E2 | Dried rhizome, cut or powdered, or equivalent preparations | 2 to 4 g daily for digestive complaints; 1 to 2 g taken about an hour before travel for motion sickness11 |
| David Hoffmann, Medical Herbalism (affiliate link), 20033 | Tincture; infusion of the fresh root | 1.5 to 3 ml tincture three times daily; about 1 teaspoon of fresh grated root per cup, covered, steeped 5 minutes |
| Sebastian Pole, Ayurvedic Medicine (affiliate link), 20064 | Fresh root as hot tea; dried powder | Fresh ginger tea as needed for cramps, chills, and digestion; dried ginger capped at 2 g daily during pregnancy |
| Clinical trial protocols67 | Dried powder in capsules | 1 g daily, split into divided doses, in the pregnancy nausea and menstrual pain trials above |
| Culinary use | Fresh slices, grated root, or ground spice in food | To taste, daily. Food amounts sit comfortably below every therapeutic range here. |
The spread is smaller than it looks. Most sources land between 1 and 4 grams of dried rhizome per day, and the trial doses sit inside the traditional ranges. The larger variable is form: a gram of dried ginger is considerably hotter than a gram of fresh.
Preparations
The oleoresin chemistry above drives these choices. Alcohol and fats carry the pungent compounds best, hot water gets a working portion of them, and the aroma rides on a volatile oil that escapes with steam.
- Fresh ginger decoction. Simmer 4 to 6 thin slices of fresh root per cup of water, covered, for 15 minutes. Covering the pot keeps the volatile oil in the tea instead of in your kitchen air. This is the preparation traditional sources name for chills, queasiness, and menstrual discomfort, and the form the Eclectics used for breaking up a cold.1
- Tincture. Alcohol extracts the full oleoresin, which makes tincture the most complete and shelf-stable preparation. Hoffmann's range is 1.5 to 3 ml, three times daily.3
- Powder in capsules. The route used in nearly every clinical trial, and the form sources describe for the higher dried-ginger ranges, since few people want to eat that much powder outright.
- Honey and fresh juice. Grated fresh ginger pressed for juice and stirred into raw honey is a traditional warming syrup, used in Ayurvedic practice for coughs with clear, thin mucus.4 The honey carries the pungent resin well and softens its edge.
- External compress. A cloth soaked in strong hot ginger tea and applied to the skin is a folk use of the rubefacient action, meaning it draws blood to the surface and warms the area. King's records ginger plasters applied for headache on the same principle.1
Ginger also pairs naturally with other warming herbs. It appears alongside cinnamon in winter teas, with black pepper in the Trikatu digestive formula, and next to its cousin turmeric in the kitchen, where the two rhizomes share a family and a long history of being cooked together.
Handmade in Montana
Ginger's warmth runs through several of the goods made here in Montana. Everything below is in stock and ships from my home studio.
Safety, Contraindications, and Interactions
None of the following is medical advice. These are documented cautions from named sources, offered for education. Decisions about medications, pregnancy, and health conditions belong with you and your trusted healthcare provider.
- Anticoagulant and antiplatelet medications. The evidence cuts both ways, as the research section shows: laboratory platelet effects, a human trial finding no interaction with warfarin, and scattered case reports of raised INR in patients on anticoagulants.89 Because the cost of getting this wrong is high, the prudent position is unchanged: culinary amounts are considered low risk, and anyone on warfarin, phenprocoumon, or antiplatelet drugs should involve their prescriber before using ginger medicinally, and monitor as advised.
- Hot constitutions. Pole cautions against ginger where there is already substantial heat: hyperacidity, reflux, ulcers, inflamed joints, heavy sweating.4 The energetics predict this: a hot, drying herb aggravates hot, dry states.
- Gallstones. Commission E advises people with gallstones to consult a practitioner before using ginger, since it stimulates bile flow.2
- High doses on an empty or irritated stomach. Several grams of dried powder at once can cause heartburn and gastric burning, particularly in people with gastritis or ulcers. Food amounts do not carry this problem.
Ginger in Pregnancy
This is the one place where respected sources openly disagree, so both positions are laid out.
- The cautious position. German Commission E lists pregnancy as a contraindication for ginger, a stance written into its 1990 monograph.2
- The permissive position. Randomized placebo-controlled trials since then, including Vutyavanich's, gave 1 g daily to pregnant women and found reduced nausea with no detected harm to pregnancy outcomes,6 and Hoffmann points to the long record of traditional use for morning sickness.3
- The traditional middle ground. Both Ayurvedic and Chinese practice permit ginger in pregnancy while capping dried ginger at about 2 g per day.4
Trial data on rare outcomes are still thin, which is why the disagreement persists. If you are pregnant, this decision belongs in a conversation with your midwife, doctor, or clinical herbalist rather than on a product label or this page.
Frequently Asked Questions
Is ginger good for nausea?
Nausea is ginger's most studied area. Randomized trials reported reduced nausea and vomiting in pregnant women taking 1 g of dried powder daily, and traditional practice extends the use to motion sickness and ordinary upset stomach. If your nausea is severe, persistent, or paired with other symptoms, see your healthcare provider.
What is the difference between fresh and dried ginger?
Drying converts gingerols into hotter shogaols, so dried ginger is more heating gram for gram. Traditions use fresh ginger for surface conditions like chills, nausea, and cramps, and dried ginger for deep, chronic cold digestion.
Does ginger thin the blood?
Unproven either way. Laboratory studies show platelet effects, the strongest human trial found no interaction with warfarin, and a handful of case reports suggest one. Culinary use is considered low risk. If you take a blood thinner, talk with your prescriber before using ginger medicinally.
How do I make ginger tea?
Simmer 4 to 6 thin slices of fresh root per cup of water in a covered pot for 15 minutes. The lid matters, because the aromatic oil leaves with the steam.
Can I take ginger while pregnant?
Sources disagree. Trials reported reduced pregnancy nausea at 1 g daily with no detected harm, while Commission E lists pregnancy as a contraindication and traditional systems cap dried ginger near 2 g daily. Bring the question to your midwife or doctor.
Are ginger and turmeric related?
Yes. Both are rhizomes in the Zingiberaceae family, along with cardamom. They share warming, circulation-supporting characters and are often cooked together. The turmeric monograph covers its cousin in full.
Does ginger help with menstrual cramps?
In one double-blind trial, women taking 1 g of ginger powder daily reported relief similar to those taking mefenamic acid or ibuprofen over a single cycle, though the trial lacked a placebo group. The traditional record points the same way, from the Eclectics' use of ginger tea for painful menstruation to Ayurvedic practice. Cramps that are severe or worsening deserve a medical workup.
Keep reading
- Peppermint — the cooling counterpart in digestive tea blends
- Black Pepper — ginger's partner in the Trikatu formula
- Gut health articles
Sources
- Felter HW, Lloyd JU. Zingiber (Ginger). King's American Dispensatory, 1898. Public domain, hosted at Henriette's Herbal.
- German Commission E monograph, Zingiberis rhizoma (1990). Expanded Commission E: Ginger root. American Botanical Council.
- Hoffmann D. Medical Herbalism: The Science and Practice of Herbal Medicine (affiliate link). Healing Arts Press, 2003.
- Pole S. Ayurvedic Medicine: The Principles of Traditional Practice (affiliate link). Singing Dragon, 2006.
- Bensky D, Clavey S, Stöger E. Chinese Herbal Medicine: Materia Medica, 3rd edition. Eastland Press, 2004.
- Vutyavanich T, Kraisarin T, Ruangsri R. Ginger for nausea and vomiting in pregnancy: randomized, double-masked, placebo-controlled trial. Obstetrics and Gynecology. 2001;97(4):577-582.
- Ozgoli G, Goli M, Moattar F. Comparison of effects of ginger, mefenamic acid, and ibuprofen on pain in women with primary dysmenorrhea. Journal of Alternative and Complementary Medicine. 2009;15(2):129-132.
- Jiang X, Williams KM, Liauw WS, et al. Effect of ginkgo and ginger on the pharmacokinetics and pharmacodynamics of warfarin in healthy subjects. British Journal of Clinical Pharmacology. 2005;59(4):425-432.
- Marx W, McKavanagh D, McCarthy AL, et al. The effect of ginger (Zingiber officinale) on platelet aggregation: a systematic literature review. PLOS ONE. 2015;10(10):e0141119.
- Anh NH, Kim SJ, Long NP, et al. Ginger on human health: a comprehensive systematic review of 109 randomized controlled trials. Nutrients. 2020;12(1):157.
- European Medicines Agency. Assessment report on Zingiber officinale Roscoe, rhizoma (revision 1), summarizing the Commission E posology for motion sickness.