Curcuma longa
Turmeric
Generally recognised as safeOther names: Turmeric
Rhizome (turmeric) widely used in Asia; native to tropical Asia.
Perennial with stout rhizome and showy inflorescences.
- Family
- Zingiberaceae
- Plant type
- Perennial herb
What the safety levels mean (expand legend)
- Generally recognised as safe. Often a common herb with reasonable harvest and use; still read the specific warnings on the card.
- Information. Primarily informational — details in the text and warnings below matter most.
- Caution. Needs extra care (dose, duration, sensitive groups, interactions).
- Risky. Significant risks — verify sources, contraindications and professional guidance.
- Not for home experimentation. Not suitable to experiment with at home without knowledge and certainty.
- High risk for internal use. Particular risk with internal use (e.g. alkaloids); avoid prolonged or irresponsible dosing.
- Not specified. Level not filled in yet — rely on individual warnings and links below.
Photograph on Wikimedia Commons (CC BY 3.0).
Plant habit
Safety — read before use
For this herb it is important to check warnings, mix-ups and cautions. Start with the Safety section.
Quick overview
A practical summary; details are in the sections below.
- Safety grade
- Generally recognised as safe details
- Scientific sources on the card
- Yes — sources are listed with claims Science section
- When and what to harvest
- Rhizome — January–March
- Processing methods
Decoction, Powder, Culinary use
All methods and recipes on the card- Topics and symptoms
Bloating & gas, Digestion, Heavy digestion
Topics section, Symptoms overview
Identification and mix-ups
Large leaves and stem inflorescence by cultivar.
Possible mix-ups and risks
Related Curcuma species vegetatively.
Similar herbs
- Ginger
Both ginger-family rhizomes from the same kitchen; ginger is beige and hot, turmeric deep orange and earthy-bitter. As powders the colour rules out any mix-up.
- Greater galangal
Galangal has a pale, hard rhizome with pink shoots and a resinous scent; it never stains.
Topics and symptoms
More topics are in the symptoms and topics overview.
- Bloating & gasTraditional· Traditional / cultural framing
- DigestionTraditional· Traditional / cultural framing
- Heavy digestionTraditional· Traditional / cultural framing
Geographic occurrence
Myanmar
Common (expected wild occurrence in the region)
Japan
Common (expected wild occurrence in the region)
Brazil
Common (expected wild occurrence in the region)
Mexico
Common (expected wild occurrence in the region)
India
Common (expected wild occurrence in the region)
Indonesia
Common (expected wild occurrence in the region)
Thailand
Common (expected wild occurrence in the region)
Viet Nam
Common (expected wild occurrence in the region)
Harvest
- RhizomeJanuary–March
zima
Region: IndiaNotes: Rhizomes are dug 8–10 months after planting, once the tops die back (January–March in India). After harvest they are traditionally boiled briefly, sun-dried for 10–15 days and polished — which gives the familiar deep orange powder.
Storage
- Drying(Rhizome)
Whole dried rhizome keeps 2–3 years, ground powder 12 months; after that colour and aroma fade.
- Light:
- Curcumin fades in light — dark container.
- Moisture:
- Powder clumps and moulds; seal and keep dry.
- Safety:
- Stains permanently: glass and metal are better than plastic.
- Refrigeration(Rhizome)
Fresh rhizome keeps 2–3 weeks in the fridge in a paper bag; grated it can be frozen.
- Moisture:
- In sealed plastic it sweats and rots.
Processing methods on this herb card
Longer simmering of plant material in water.
Full method description (from the catalogue)
A decoction is made by simmering plant material in water — often around 10–20 minutes depending on tradition and plant part. Denser parts (roots, bark, some seeds) are often prepared more reliably this way than with a short infusion.
Compared with an infusion it can extract more compounds, but also more tannins or bitterness; the flavour profile differs from a delicate tea. Combine this overview with the herb card for suitable plant part and contraindications.
Traditional context for this method: yes·Scientific context for this method: no
Finely ground dried herb; dosing and solubility depend on species.
Full method description (from the catalogue)
Powder increases surface area for liquids or food. Home milling needs a clean grinder and control of fineness; very fine powder may clog tea filters.
Store airtight against moisture and pests.
Traditional context for this method: yes·Scientific context for this method: yes
Cooking, baking, seasoning as food — general category without therapeutic claims.
Full method description (from the catalogue)
Culinary use covers herbs as ingredients in dishes, drinks, or spice mixes. This overview does not evaluate medicinal effects — only reminds you about species intent, allergies, and heat treatment where needed (e.g. some fruits or plant parts).
Combining with alcohol, sugar, or long cooking changes outcomes; verify culinary sources.
Traditional context for this method: yes·Scientific context for this method: no
Traditional / spiritual use
Kept separate from science — entries are cultural or symbolic, not medical advice.
Haldi — the colour of purity and good fortune
General
Spiritual useFolk useRitualSymbolismIn Hindu tradition turmeric marks luck, purity and fertility. Before a wedding both bride and groom are painted with turmeric paste (the haldi ceremony); the orange-yellow colour adorns offerings, thresholds and temple statues and is tied to the sun and the goddess. A record of tradition, not a claim about an effect on the skin.
- Form:
- pasta na kůži, barvivo, obětina
- Claim strength:
- Tradition
- Source note:
- Living Indian wedding and temple practice (haldi, kunkumam); described in the ethnographic literature on South Asian ritual.
Scientific notes
Each claim lists a study type and a source (URL or DOI) where available. Dose notes from the literature are informational only.
How to read evidence strength and study type labels
Labels summarise how the catalogue entry is tagged — they are not a medical verdict on efficacy. For every row, read the summary, limitations and source link.
Evidence strength
- Evidence level not specified
- The author did not grade the record; judge from the summary, limitations and source link.
- Narrative / orientational literature
- Descriptive or expert literature without controlled group comparison — context rather than proof of effect.
- Weak evidence
- Study or conclusion with major methodological limits; treat only as a pointer for further reading.
- Preliminary findings
- First or smaller studies — interesting direction, not the final word on efficacy or safety.
- Moderate strength of evidence
- Moderate strength by study design; sample and context limits still apply.
- Stronger evidence
- Stronger design or consistency of results within the study's stated limits.
- Review article
- A review summarises multiple sources; quality depends on review method and field.
Study type
- Narrative / expert text
- Expert text or overview without a classical study design.
- In vitro study
- Cell culture or test-tube experiment — does not show an effect in the body.
- Animal study
- Animal model — transfer to humans is not automatic.
- Observational study
- Observing groups without random treatment assignment; confounding is possible.
- Clinical trial
- Human clinical trial; sample size and control group matter.
- Randomised controlled trial
- Randomised controlled trials are among the stronger designs when well conducted.
- Review study
- A review aggregates multiple papers — quality depends on selection rules.
- Systematic review
- Systematic review with explicit search and selection methodology.
- Meta-analysis
- Statistical pooling of studies; outcome depends on input data and heterogeneity.
- Regulatory assessment / monograph (EMA, WHO…)
- Regulatory body summary for a herbal product — different context from a single RCT; often about products, not home tea.
- Expert monograph (herbal preparations)
- Structured literature summary for a plant or drug — quality depends on author and edition year.
The HMPC accepted, on the basis of long-standing use, turmeric rhizome preparations (tea, powder, extracts) for relief of mild digestive problems — feelings of fullness, slow digestion and flatulence — in adults. Clinical studies were judged poorly designed.
Review articleRegulatory assessment / monograph (EMA, WHO…)Year: 2018Limitations: Traditional use; only one controlled study. Side effects: dry mouth, flatulence, stomach irritation. Contraindications: bile duct obstruction, cholangitis, liver disease, gallstones.
EMA Committee on Herbal Medicinal Products (HMPC)
European Union herbal monograph on Curcuma longa L., rhizoma
The review summarises anti-inflammatory and antioxidant actions of curcumin in laboratory and small clinical studies, alongside its very low bioavailability, which piperine or lipid formulations improve.
Narrative / orientational literatureReview studyYear: 2017Limitations: Narrative review without meta-analysis; most effects come from concentrated extracts, not kitchen turmeric. It does not support treatment of any disease.
Hewlings SJ, Kalman DS — Foods
Curcumin: A Review of Its Effects on Human Health
DOI: 10.3390/foods6100092
Images
The main photo is in the card header. More images will appear here when available.
Safety
What the warning types mean
The type on each warning helps group themes — it does not replace the separate severity badge.
- Internal use
- Risks from swallowing, extracts, duration of use or concentration for internal use.
- Interactions / medicines
- Possible effect on medicines or concurrent treatment — check sources and a professional.
- Raw plant parts
- Raw, unripe or poorly prepared plant parts can be dangerous.
- Toxins and regulation
- Toxic constituents or regulated compounds (e.g. in distillates).
- Contact with the plant
- Skin or mucosa irritation from contact with fresh plant or sap.
- Allergy
- Allergic reactions, often linked to family sensitisation.
- Harvesting and contamination
- Contamination, species mix-ups or harvesting from unsuitable places.
- Bile ducts and liver diseaseModerate severityInternal use
The EMA monograph excludes medicinal use of turmeric in bile duct obstruction, cholangitis, liver disease and gallstones, because the rhizome increases bile flow. Kitchen amounts in food are not affected.