Turmeric

Pronunciation: TUR-mer-ik.

Generic name
turmeric (Curcuma longa); active compound curcumin
Drug class
Not applicable -- turmeric is a culinary spice and dietary/food supplement, not a regulated drug class
Form
Capsules, tablets, powders, extracts, or the whole/ground spice
Route
Oral (capsule, tablet, powder, tea, or as a food ingredient); occasional topical use
Legal status
Dietary supplement / food product in the United States, United Kingdom, European Union, and New Zealand; typically a licensed/listed low-risk complementary-medicine product (Natural Health Product in Canada, 'Listed' AUST L medicine in Australia) -- not a prescription or pharmacy-only medicine in any of these 6 markets.

Availability and supply rules vary by country

Trade names by country: United States

Australia: · Full directory

What turmeric (Curcuma longa); active compound curcumin is and how it works

Turmeric is a spice from the Curcuma longa plant, long used in cooking and in traditional medicine systems. Its main active compounds, curcuminoids (especially curcumin), are sold as dietary/food supplements. It is not a regulated prescription or over-the-counter medicine in the United States, United Kingdom, European Union, or New Zealand; in Canada and Australia it is available through each country's lower-risk complementary/natural-health-product licensing pathway, still distinct from prescription-drug approval. (1) (4)

Turmeric used as a food spice, or as a conventionally formulated oral supplement at recommended amounts for up to 2-3 months, is generally considered likely safe for most healthy adults. Evidence that it meaningfully treats any specific medical condition is still preliminary. If you are considering turmeric or curcumin supplements for a health condition, are taking other medicines, are pregnant or breastfeeding, or have liver or gallbladder problems, discuss this with your healthcare provider first.

Mechanism of action: how turmeric (Curcuma longa); active compound curcumin works

Curcumin, the principal curcuminoid in turmeric, has antioxidant and anti-inflammatory properties in laboratory and animal studies, and inhibits platelet aggregation (via thromboxane A2 synthesis and calcium-signalling pathways) and prolongs coagulation parameters (aPTT and PT) at sufficient concentrations, providing the pharmacological basis for its bleeding-risk interaction with anticoagulants/antiplatelets. It also has a choleretic/cholagogue effect, stimulating bile production and gallbladder contraction. Curcumin has poor oral bioavailability in its native form, which is why many commercial products use piperine (black pepper extract) or other formulation technologies to increase absorption -- these enhanced-bioavailability formulations are specifically the ones linked to reported liver injury. (3) (2) (5)

What turmeric (Curcuma longa); active compound curcumin is used for

Osteoarthritis (knee)

Turmeric/curcumin supplements are commonly used for joint pain and function in knee osteoarthritis. Initial evidence is positive, but higher-quality evidence is still needed to confirm the size of any real benefit. (1)

Nonalcoholic fatty liver disease (NAFLD)

Some initial research suggests oral turmeric or curcumin might improve certain NAFLD-related measures, but it is not yet clear which specific measures are consistently improved. (1)

Oral mucositis (from cancer treatment)

Initial research suggests turmeric or curcumin, used orally or as a mouthwash, might help improve mucositis symptoms. (1)

Other traditionally claimed uses (depression, allergies, itching, high cholesterol, and others)

Turmeric has a long history of traditional use for many conditions, but for these and most other claimed uses, there is not enough reliable evidence to conclude that oral turmeric or curcumin provides a meaningful benefit. (1)

Before taking turmeric (Curcuma longa); active compound curcumin

Do not take / not appropriate for

  • Turmeric/curcumin supplements are not recommended during pregnancy, since safety has not been established at supplement-level amounts (culinary, food-level use of turmeric as a spice is a separate matter from concentrated supplements). (pregnancy) (1)
  • If you have gallstones, a bile duct blockage, or another biliary condition, discuss turmeric/curcumin supplements with your healthcare provider before use, since turmeric stimulates bile production and gallbladder contraction and could aggravate these conditions. (gallbladder/biliary disease) (3)

Tell your clinician about

  • Whether you take warfarin, aspirin, clopidogrel, or any other blood-thinning (anticoagulant or antiplatelet) medicine, because of a real reported interaction that raised bleeding risk.
  • Any gallstones, bile duct problems, or other gallbladder or biliary disease.
  • Any liver problems, or any past reaction to a turmeric or curcumin supplement.
  • All other medicines and supplements you take, since herb-drug interactions are possible even when not yet fully documented.
  • Pregnancy, plans for pregnancy, or breastfeeding.
  • Any planned surgery, since some clinicians advise stopping curcumin supplements 1-2 weeks beforehand because of its effects on bleeding and platelets -- follow your surgical team's specific instructions.
(1) (5) (3)

How to take turmeric (Curcuma longa); active compound curcumin

  • Follow the amount stated on the product label, or the amount recommended by your healthcare provider -- there is no single official medical dose, since turmeric is not a regulated medicine.
  • Conventionally formulated oral turmeric or curcumin is generally considered likely safe at recommended amounts for up to about 2-3 months; ask your healthcare provider about safety for longer-term use.
  • Be aware that 'enhanced absorption' or high-bioavailability curcumin products are formulated differently from plain turmeric and are the type most often linked to reports of liver injury -- read labels carefully and mention the specific product to your healthcare provider.
  • If you are having surgery, tell your surgical team you take a turmeric/curcumin supplement well in advance, since they may advise a temporary pause beforehand.
(1)

Procedures and treatment changes

Tell the treating team before surgery, procedures, or any medicine change. Do not alter treatment without the responsible clinician. (1) (2) (3) (4) (5) (6) (7) (8) (9)

Missed dose

Because turmeric is a supplement rather than a prescribed medicine with a strict dosing schedule, a missed dose of a turmeric/curcumin product is not usually a medical concern -- simply resume your normal use. If you were given a specific schedule by a healthcare provider for a particular reason, follow their guidance.

Overdose

Taking a very large amount of turmeric or curcumin supplement is unlikely to cause a classic medical emergency, but can worsen digestive side effects (nausea, vomiting, diarrhoea) and may raise the risk of liver-related symptoms. If you develop fatigue, poor appetite, dark urine, yellowing of the skin or eyes, or persistent vomiting after taking a turmeric/curcumin product, contact a poison control centre or seek medical attention promptly. (1) (2)

Side effects

Side effects and their urgency vary; report severe, persistent, or concerning symptoms.

Nausea and vomiting.

What to notice: Nausea and vomiting.

What to do: Discuss persistent or troublesome symptoms with the treating clinician or pharmacist. (1)

Acid reflux and stomach upset.

What to notice: Acid reflux and stomach upset.

What to do: Discuss persistent or troublesome symptoms with the treating clinician or pharmacist. (1)

Diarrhoea or constipation.

What to notice: Diarrhoea or constipation.

What to do: Discuss persistent or troublesome symptoms with the treating clinician or pharmacist. (1)

Hives or itching with topical curcumin use.

What to notice: Hives or itching with topical curcumin use.

What to do: Discuss persistent or troublesome symptoms with the treating clinician or pharmacist. (1)

Serious warnings

Liver injury linked to high-bioavailability curcumin supplements — high caution

Symptoms: Fatigue, nausea, poor appetite, dark urine, or yellowing of the skin or eyes (jaundice), usually appearing 1 to 4 months after starting the supplement.

Action: Contact your healthcare provider promptly for liver testing and further guidance if any of these symptoms occur; a clinician will assess whether the supplement needs to be discontinued. Health Canada's 2025 safety review specifically required updated liver-injury warning labels on licensed turmeric/curcuminoid products because of this signal. (2) (6) (1)

Increased bleeding risk with anticoagulant or antiplatelet medicines — high caution

Symptoms: Unusual bruising, nosebleeds, bleeding gums, blood in urine or stool, or a markedly elevated INR if you monitor warfarin therapy.

Action: Tell your prescriber about any turmeric/curcumin use before starting, and contact them promptly if you notice unusual bleeding or bruising -- a real reported case showed a patient's INR rise above 10 within weeks of starting a turmeric product while on warfarin. (5)

Gallbladder pain or biliary colic in people with gallstones — high caution

Symptoms: Sudden pain in the upper right abdomen, especially after eating, sometimes with nausea.

Action: Seek prompt medical attention for severe or persistent abdominal pain; a clinician will assess whether it is related to gallstones or bile duct obstruction, which turmeric's bile-stimulating (cholagogue) effect could aggravate. (3)

Interactions

  • Warfarin and other anticoagulant or antiplatelet medicines (such as aspirin or clopidogrel): turmeric/curcumin may add to bleeding risk through NSAID-like and antiplatelet effects -- a real reported case showed a markedly raised INR in a patient on warfarin. Tell your prescriber before combining these. (5)
  • Any other medicine or supplement: because turmeric/curcumin is not as extensively studied for interactions as a regulated drug, tell your healthcare provider or pharmacist about all medicines and supplements you take before starting it. (1)

Pregnancy, breastfeeding, kidney/liver function, age

Pregnancy

Turmeric/curcumin supplements (as distinct from turmeric used as a food spice) may be unsafe during pregnancy, and are best avoided unless a healthcare provider advises otherwise. (1) (2) (3) (4) (5) (6) (7) (8) (9)

Breastfeeding

Little is known about the safety of turmeric in amounts greater than typical food use while breastfeeding -- discuss with your healthcare provider. (1) (2) (3) (4) (5) (6) (7) (8) (9)

Children

Evidence on turmeric/curcumin supplement safety and effectiveness in children is limited; use only under a healthcare provider's guidance. (1) (2) (3) (4) (5) (6) (7) (8) (9)

Elderly

No specific dose adjustment is described in the sources reviewed, but older adults are more likely to take anticoagulant or antiplatelet medicines, making the bleeding-risk interaction especially relevant to discuss with a healthcare provider. (1) (2) (3) (4) (5) (6) (7) (8) (9)

Hepatic_impairment

People with existing liver problems should consult a healthcare provider before use, given the documented (though rare) liver-injury signal with curcumin supplements, particularly high-bioavailability formulations. (1) (2) (3) (4) (5) (6) (7) (8) (9)

Monitoring

Before starting

  • Review of all current medicines and supplements, especially anticoagulants/antiplatelets
  • Discussion of any personal history of liver or gallbladder disease

During treatment

  • Watch for symptoms of liver injury (fatigue, poor appetite, dark urine, jaundice), particularly with high-bioavailability curcumin products.
  • Watch for unusual bruising or bleeding if taking any blood-thinning medicine.
  • For patients on warfarin, closer INR monitoring may be advisable if a turmeric/curcumin product is started, at the prescriber's discretion.
(2) (5)

Storage

Store ground turmeric spice and supplement products at room temperature, away from moisture and direct light, and follow any specific storage instructions on the product label.

Professional information

Clinician-facing context only. Turmeric/curcumin is not a regulated drug in most of the markets reviewed, so there is no official prescribing label -- this summarises NIH NCCIH, NIH LiverTox, NCBI Bookshelf, and national supplement-regulator material; verify against current sources before advising patients.

General (no official medical dose exists)

Indication: Osteoarthritis, NAFLD, oral mucositis (preliminary evidence only)

Dose summary: No standardised, regulator-set therapeutic dose exists. NCCIH describes conventionally formulated oral turmeric/curcumin as likely safe at recommended label amounts for up to 2-3 months. Clinical trials have used varying curcumin doses, often in the several-hundred-milligram to low-gram range with enhanced-absorption formulations, but there is no single validated standard dose.

Renal context: Not established in the sources reviewed. (1)

Mechanism of action

Hepatic guidance

Idiosyncratic hepatotoxicity has been reported with turmeric/curcuminoid supplements, especially high-bioavailability formulations and those combined with piperine; a proposed immune-mediated mechanism is linked to the HLA-B*35:01 allele. Advise patients with pre-existing liver disease to consult a healthcare provider before use and to seek care promptly for jaundice, dark urine, or unexplained fatigue.

Overdose note

No well-characterised acute overdose syndrome is described for oral turmeric/curcumin in the sources reviewed; very high intake may worsen gastrointestinal side effects and theoretically raises bleeding and hepatotoxicity risk. Manage symptomatically and per local poison-control guidance. (3) (2) (5)

Frequently asked questions

Is turmeric a regulated medicine in the US, UK, Europe, Canada, Australia, and New Zealand?

No. Turmeric/curcumin is not a prescription or pharmacy-regulated medicine in any of these 6 markets. It is sold as a food/spice or a dietary supplement in the US, UK, EU, and New Zealand, and through a lower-risk complementary/natural-health-product licensing pathway in Canada and Australia -- none of these are equivalent to prescription-drug approval. (4) (7) (8) (6) (9) (5)

Does turmeric really help with joint pain or other health conditions?

Evidence is still preliminary. For knee osteoarthritis, initial studies are positive but higher-quality evidence is needed. For most other commonly claimed uses (including depression, allergies, itching, and high cholesterol), there is not yet enough reliable evidence to confirm a meaningful benefit. (1)

Can turmeric supplements harm the liver?

Rare but real cases of liver injury have been reported, particularly with 'enhanced absorption' or high-bioavailability curcumin products (sometimes combined with black pepper extract). Health Canada reviewed this signal in 2025 and now requires liver-injury warning labels on licensed turmeric/curcuminoid products. Contact a healthcare provider promptly if you develop fatigue, poor appetite, dark urine, or yellowing of the skin or eyes while taking a turmeric/curcumin supplement. (2) (6)

Can I take turmeric with warfarin or other blood thinners?

This combination needs caution and should be discussed with your prescriber. A real reported case showed a patient's INR rise to over 10 (a serious bleeding-risk level) within weeks of starting a turmeric-containing product while on warfarin, likely from curcumin's NSAID-like and antiplatelet effects. (5)

Is turmeric safe if I have gallstones?

Turmeric stimulates bile production and gallbladder contraction (a cholagogue effect), which could aggravate gallstones or a bile duct blockage. Discuss any gallbladder or biliary condition with your healthcare provider before using a turmeric/curcumin supplement. (3)

What is the mechanism of action of turmeric (Curcuma longa); active compound curcumin?

Curcumin, the principal curcuminoid in turmeric, has antioxidant and anti-inflammatory properties in laboratory and animal studies, and inhibits platelet aggregation (via thromboxane A2 synthesis and calcium-signalling pathways) and prolongs coagulation parameters (aPTT and PT) at sufficient concentrations, providing the pharmacological basis for its bleeding-risk interaction with anticoagulants/antiplatelets. It also has a choleretic/cholagogue effect, stimulating bile production and gallbladder contraction. Curcumin has poor oral bioavailability in its native form, which is why many commercial products use piperine (black pepper extract) or other formulation technologies to increase absorption -- these enhanced-bioavailability formulations are specifically the ones linked to reported liver injury. (3) (2) (5)

What is the generic name of Turmeric?

The generic name is turmeric (Curcuma longa); active compound curcumin. (1) (4)

What class of drug is turmeric (Curcuma longa); active compound curcumin?

Turmeric is classed as: Not applicable -- turmeric is a culinary spice and dietary/food supplement, not a regulated drug class. (1) (4)

References

  1. Turmeric: Usefulness and SafetyNational Center for Complementary and Integrative Health (NCCIH), part of the U.S. National Institutes of Health · United States · accessed 2026-07-29 · source 1
  2. Turmeric -- LiverTox: Clinical and Research Information on Drug-Induced Liver InjuryLiverTox, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) / National Library of Medicine (NCBI Bookshelf) · United States · accessed 2026-07-29 · source 2
  3. Turmeric, the Golden SpiceNCBI Bookshelf (Herbal Medicine: Biomolecular and Clinical Aspects, 2nd edition), U.S. National Library of Medicine · United States · accessed 2026-07-29 · source 3
  4. Dietary Supplements (FDA) -- regulatory framework under the Dietary Supplement Health and Education Act of 1994 (DSHEA)U.S. Food and Drug Administration · United States · accessed 2026-07-29 · source 4
  5. Beware turmeric/curcumin containing products can interact with warfarinMedsafe (New Zealand regulator) -- Centre for Adverse Reactions Monitoring (CARM) safety communication · New Zealand · accessed 2026-07-29 · source 5
  6. Summary Safety Review -- Turmeric and Curcuminoids for Oral Use -- Assessing the Potential Risk of HepatotoxicityHealth Canada -- Natural Health Products Directorate summary safety review · Canada · accessed 2026-07-29 · source 6
  7. UK regulatory framework for food/dietary supplements (Food Supplements Regulations 2003, under the Food Safety Act 1990) and the MHRA borderline-products processUK Food Standards Agency (FSA) and Medicines and Healthcare products Regulatory Agency (MHRA) · United Kingdom · accessed 2026-07-29 · source 7
  8. Safety of tetrahydrocurcuminoids from turmeric (Curcuma longa L.) as a novel food pursuant to Regulation (EU) 2015/2283European Food Safety Authority (EFSA), Panel on Nutrition, Novel Foods and Food Allergens · European Union · accessed 2026-07-29 · source 8
  9. Listed complementary medicines -- regulatory pathway overviewTherapeutic Goods Administration (TGA), Australia · Australia · accessed 2026-07-29 · source 9

Brand names by country

Single-ingredient turmeric (Curcuma longa); active compound curcumin names are shown separately by country. Product availability, strengths, and supply rules can change; combination products are not included here.

Priority countries

United States

  • Garden of Life MyKind OrganicsGarden of Life MyKind Organics
  • HimalayaHimalaya
  • Source NaturalsSource Naturals
  • Herb PharmHerb Pharm
  • youtheoryyoutheory
  • GNC Women's Ultra MegaGNC Women's Ultra Mega
  • DCDC
  • Health PlusHealth Plus
  • New NordicNew Nordic
  • Mountain Meadow HerbsMountain Meadow Herbs
View brands in additional countries.

This page provides general reference information about turmeric/curcumin as a dietary supplement and food ingredient. It is not medical advice, a treatment recommendation, or a substitute for guidance from a qualified healthcare provider, especially if you take other medicines or have a liver, gallbladder, or bleeding-related condition.

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