Ginger

Zingiber officinale Roscoe (Zingiberaceae) is a sterile, cultivated perennial. NCBI Taxonomy files it as taxon 94328. It does not set reliable seed in cultivation; farmers plant rhizome pieces. Shoots are reed-like, with two-ranked lanceolate leaves and a ligule. The inflorescence is a cone of overlapping bracts; flowers are small, yellowish, and often scarce in commercial plots. The medicinal and culinary part is Zingiberis rhizoma: a branched, palmately knobby rhizome with a corky tan skin, a pale-yellow fibrous interior, and a sharp aroma. It is a stem, not a root. Ph. Eur. monograph 1522 is the quality frame for the dried drug.

Native as a cultigen in tropical Asia; now grown across South and Southeast Asia, the Caribbean, Africa, and Australia. Young “spring” ginger is juicier and milder; mature rhizome is hotter and more fibrous. Drying and heating convert gingerols toward shogaols. Chinese pharmacy splits shēng jiāng (fresh) from gān jiāng (dried)—same species, different process, different traditional indications. Japanese and Korean kitchens pickle young rhizome; that is food chemistry, not a motion-sickness monograph.

The hot principles are phenolic ketones: 6-gingerol in fresh rhizome, 6-shogaol enriched by drying, and zingerone from further degradation. Essential oil (zingiberene and kin) carries the scent. Related spices are not substitutes: turmeric (Curcuma longa) is curcuminoids; greater galangal (Alpinia galanga) is a different ginger-family rhizome; grains of paradise and cardamom are still other genera. Ornamental torch ginger (Etlingera) is not Z. officinale.

Sanskrit, Chinese, and Greco-Roman sources already treat ginger as spice and stomach medicine. The spice trade made dried rhizome a shipboard antiemetic long before capsules. Fresh versus dried splits in Chinese materia medica are centuries old. British herbal books kept ginger for cold, wind, and nausea. None of that is a randomized trial.

German Commission E (1990) listed powdered rhizome for dyspepsia and motion-sickness prevention. EMA’s HMPC wrote a well-established-use monograph for powdered ginger to prevent motion sickness (first adopted 2012; revision 1, 7 May 2025) and a longer traditional-use list: symptomatic motion sickness, mild spasmodic gut complaints, temporary loss of appetite, minor articular pain, and common-cold symptoms. The 2025 revision is the current EU herbal law object—not a license for every candy or shot.

Late-twentieth-century trials moved ginger into pregnancy nausea, postoperative nausea, and chemotherapy. Ryan and colleagues’ URCC CCOP study (2012) randomized 744 patients, 576 of whom provided analyzable data. Viljoen’s 2014 Nutrition Journal meta-analysis and Matthews’s Cochrane review of NVP interventions are the pregnancy evidence pile NCCIH still leans on. History here is a spice that picked up a trial file, not a new plant.

Gingerols and shogaols act on the gut more than on a single brain receptor. Proposed mechanisms include 5-HT3 receptor antagonism (the same family as ondansetron, at a much milder, non-drug level), slowed or regularized gastric motility, and TRPV1 warmth that people read as “settling.” EMA’s motion-sickness note is candid: the way it works is not fully known; some studies point at gastrointestinal motility. That is enough to explain a peripheral antiemetic and not enough to call ginger a serotonin drug.

Anti-inflammatory work for osteoarthritis is mostly gingerol/shogaol effects on eicosanoids and cytokines in experimental systems. Bartels’s 2015 meta-analysis of OA RCTs is the human summary, not a replacement for NSAIDs. Antiplatelet effects show up in vitro and in older volunteer work; EMA’s 2025 monograph lists no known drug interactions for the specified powders and tinctures. US clinical pages still flag anticoagulants. Both sentences can be true: licensed EU powders have no proven warfarin interaction, and high-dose extracts still warrant a conversation about bleeding risk.

Fresh and dry are not interchangeable chemotypes. Heat and storage raise shogaols. A candied slice, a tea bag, and a standardized capsule will not share a milligram of 6-gingerol.

Motion sickness is EMA’s well-established indication for powdered rhizome in adults: 1–2 g about an hour before travel, single use. Traditional-use powder can be 500–750 mg half an hour before, with a pediatric traditional rung from age six. It is meant to prevent nausea rather than to treat it once it has started. Results vary: EMA’s bibliographic review supports prevention, while NCCIH notes that most studies of ginger for motion sickness haven’t shown it to be helpful. Prescription motion-sickness medicines such as scopolamine are better studied.

Nausea and vomiting of pregnancy: NCCIH says ginger may help, mostly as supplements rather than food, and to talk to a clinician. Viljoen et al. (Nutrition Journal 2014; PMC3995184) reviewed twelve RCTs (1,278 women); in the two placebo trials that could be pooled for nausea, ginger improved it, while the fall in vomiting episodes was not significant (p = 0.06); an apparent edge for daily doses under about 1.5 g came only from comparisons with vitamin B6, not placebo. Hu et al. (2022) pooled ginger against B6 and placebo. Matthews’s Cochrane review of NVP interventions (2015, CD007575) said ginger products may help but evidence was limited and inconsistent. ACOG’s public morning-sickness FAQ discusses ginger among non-drug options. EMA still prefers to avoid licensed ginger medicines in pregnancy as a precaution. Food amounts in cooking are not those capsules. Hyperemesis gravidarum, severe pregnancy vomiting with dehydration or weight loss, needs medical treatment; ginger alone is not enough.

Chemotherapy-induced nausea: Ryan et al. (Supportive Care in Cancer 2012; PMC3361530) randomized 744 patients (576 analyzable), all on a 5-HT3 receptor antagonist antiemetic; 0.5–1.0 g ginger daily reduced acute nausea. A smaller trial by Zick et al. (Supportive Care in Cancer 2009) found no benefit, and worse acute nausea, when ginger was added to aprepitant. Choi et al. (Nutrients 2022; PMC9739555) reviewed later CINV RCTs—signals exist, products and timing vary. Ginger is an adjunct, not a replacement for guideline antiemetics. MSKCC files it in that cautious oncology frame.

Postoperative nausea: Tóth et al. (Phytomedicine 2018) meta-analyzed prevention and found a possible alternative or add-on. Heterogeneity is real. Do not skip prescribed PONV prophylaxis for a lozenge.

Period pain (dysmenorrhea): NCCIH says research suggests ginger dietary supplements might help reduce the severity of menstrual cramps. The 2016 Cochrane review of dietary supplements for dysmenorrhea (Pattanittum et al., CD002124; 27 trials, 3,101 women) found very limited evidence that ginger eased pain compared with placebo (three trials, 266 women), and rated all the evidence in the review low or very low quality. A 2024 meta-analysis (Moshfeghinia et al., Journal of Integrative and Complementary Medicine) pooled 12 trials and found ginger better than placebo for pain intensity and duration, with no difference from NSAIDs for pain intensity; the authors noted risk of bias and sparse safety reporting. Ginger may be worth trying for ordinary cramps. Periods that are very painful, worsening, or heavy deserve a gynecology check, because conditions such as endometriosis need a diagnosis.

Osteoarthritis and “cold” folklore: Bartels 2015 (PMID 25300574) reported modest OA symptom benefit versus placebo. EMA traditional use covers minor articular pain and common-cold symptoms. Neither is a disease-modifying arthritis drug. Dyspepsia and bloating are traditional GI indications; concentrated ginger can also cause the heartburn you were treating.

Food: fresh rhizome sliced or grated in tea, stir-fry, or broth. Young ginger is milder. This is the lowest-intensity exposure.

Dried powdered rhizome: the EMA well-established object for motion sickness (1–2 g before travel). Traditional GI doses run roughly 0.18–1 g three times daily. Most pregnancy trials in Viljoen’s review gave 1,000–1,950 mg/day in divided doses, and ACOG lists 250 mg capsules four times daily; the chemotherapy benefit was clearest at 0.5–1 g/day of extract. More is not clearly better, but Viljoen’s hint that lower doses did better came only from comparisons with vitamin B6, not placebo.

Tinctures (EMA traditional: 1:10 or 1:2 in 90% ethanol) and syrups exist. Candied ginger and ale are food, with sugar as the other active. Extracts standardized to gingerols are a different, hotter product than kitchen powder.

If someone and a clinician use ginger for nausea, match the trial form: dry powder or a labeled capsule in the 0.5–1 g/day band, not an unnamed “gut shot.” Stop if reflux becomes the new problem. Hold high-dose capsules before surgery if a surgeon is already holding other antiplatelet herbs.