Curcumin (Curcuma longa extract)

Herbal anti-inflammatory agents

ATC code: A07XA-CURCUMIN

Brand names – supplements: Curcumin C3 Complex, Meriva (Indena), Theracurmin HP Supplements are not tested in clinical trials and are not registered as medications.

Updated 19 Aug 2026 · Methodology

Indications

Ulcerative colitis remission maintenance

Adjunct

The 2020 Cochrane review (7 RCTs, more than 380 patients) showed a moderate reduction in ulcerative colitis relapse rate with curcumin 1–3 g daily added to baseline mesalazine therapy. The effect is confirmed in small RCTs and requires reproduction in large multicentre trials. Major societies (, ) do not include curcumin in UC management standards. Decisions are individualised with a gastroenterologist.

Sources

ICD-10: K51 · ICD-11: DD71

Marketing claims without evidence base

The drug is promoted for these uses outside international guidelines. Each entry below is analyzed against AEMPS, FDA, EMA, Cochrane and major RCTs.

Major depressive disorder

Not recommended

Evidence for curcumin in depression is conflicting. The WFSBP/CANMAT 2022 nutraceutical guideline provisionally recommends curcumin as an adjunct to standard therapy in unipolar depression, alongside saffron and St John's wort. The Wang 2021 meta-analysis (10 RCTs, 594 patients) found only a small effect (SMD -0.32) with low-quality evidence: it rests on small high-risk trials and does not replicate in larger RCTs. General depression guidelines ( NG222, ) do not list curcumin. Use is adjunctive only, not monotherapy or first line. Core treatment of depression is psychotherapy and antidepressants.

Sources

ICD-10: F32.9 · ICD-11: 6A70.Z

Knee osteoarthritis

Not recommended

The Foods 2021 systematic review (16 RCTs, more than 1,800 patients) showed moderate reductions in pain intensity and functional improvement in knee osteoarthritis patients on curcumin 500–1,500 mg daily for 8–12 weeks. Study quality is moderate, many manufacturer-funded, samples small. 2019 does not recommend curcumin for osteoarthritis. 2019 does not include curcumin in standards. Standard therapy: physical rehabilitation, paracetamol, NSAIDs, intra-articular injections when needed, and joint replacement.

Sources

ACR: American College of Rheumatology/Arthritis Foundation Guideline for the Management of Osteoarthritis of the Hand, Hip, and Knee (2019)

ICD-10: M17 · ICD-11: FA01

Anti-aging and longevity

Not recommended

Curcumin is a polyphenol from turmeric. In anti-aging and longevity communities, curcumin is sold to slow aging, extend life, and support cognitive function. Curcumin's bioavailability is very low (under 1% after oral intake), limiting real clinical activity; even with piperine or liposomal formulations, no significant anti-aging clinical effects have been shown. International anti-aging guidelines do not include curcumin. Curcumin is relatively safe but can cause GI disturbances, thin the blood (bleeding risk with anticoagulants), and trigger allergic reactions in susceptible people. If curcumin was recommended for longevity, consider seeking a second opinion.

Sources

The Journal of Prevention of Alzheimer's Disease: Targeting cognitive aging with curcumin supplementation: A systematic review and meta-analysis (2025)

Cancer prevention

Not recommended

Curcumin for cancer prevention in people without an established diagnosis is not mentioned in international guidelines. Laboratory antitumour data have not translated to clinical practice – large positive RCTs on cancer incidence or mortality are absent. In patients with active cancer on chemotherapy or targeted therapy, curcumin use should be discussed with the treating oncologist due to potential drug interactions.

Sources

Molecular Nutrition & Food Research (Howells LM et al.): A Systematic Review Assessing Clinical Utility of Curcumin with a Focus on Cancer Prevention (2021)

How to read tiers A–F

AStrong evidence – first or second line in international guidelines
BRecommended in selected cases
CStudy data contradict each other
DBenefit not proven, no documented harm
FDocumented harm, or risk without benefit

Mechanism of action

Curcumin is the main active component of turmeric root (Curcuma longa). Inhibits the transcription factor NF-κB, pro-inflammatory cytokine synthesis (TNF-α, IL-1, IL-6), and COX-2 and lipoxygenase activity. In vitro, it demonstrates antioxidant, anti-inflammatory, and antifibrotic effects. The main clinical limitation is extremely low oral bioavailability of pure curcumin (less than 1%) due to poor absorption, rapid metabolism, and systemic elimination. Bioavailability is increased in formulations with piperine, phospholipids (Meriva), or nanoparticles.

Safety

Contraindications

Hypersensitivity to curcumin or turmeric
Pregnancy and breastfeeding
Active cholelithiasis
Acute cholangitis, biliary obstruction
Severe liver disease
Concomitant anticoagulant therapy (requires INR monitoring)

Serious adverse effects

Drug-induced hepatitis – rare but reported with enhanced-bioavailability formulations (Meriva, Theracurmin)
Increased warfarin anticoagulant effect with bleeding risk
Drug interactions via CYP3A4 inhibition (especially with piperine)

Common adverse effects

Nausea, epigastric discomfort
Diarrhoea at high doses
Yellow stool discoloration

Uncommon adverse effects

Skin allergic reactions
Headache
Altered taste

Pregnancy: can you take Curcumin (Curcuma longa extract)?

Turmeric at culinary doses is safe. High-dose curcumin supplements in pregnancy are not recommended – there are theoretical data on uterine contractility stimulation and bleeding risk.

Breastfeeding: can you take Curcumin (Curcuma longa extract)?

Turmeric at culinary doses is safe. High-dose curcumin supplements during breastfeeding are not recommended.

Calculate RID

Reference information, not a clinical decision. Discuss feeding pauses or changes with your physician or an IBCLC.

Practical notes

Timing and administration

Take with food, preferably one containing fat – curcumin is fat-soluble and absorption increases 5–10 fold with fat. Combination with piperine (10 mg) increases bioavailability 20-fold via inhibition of hepatic and intestinal glucuronidation. Meriva (phospholipid complex) and Theracurmin (nanoparticles) provide 30–80 fold higher systemic bioavailability than pure curcumin.

Dose titration

Standard standardised Curcuma longa extract dose (95% curcuminoids): 500–1,500 mg daily in 1–3 portions. Enhanced-bioavailability formulations (Meriva, BCM-95, Theracurmin): 200–500 mg daily equivalent in effect. Dietary turmeric (rice and vegetable seasoning) provides 50–200 mg curcumin at typical consumption frequencies.

Monitoring

At 8–12 weeks, assess clinical effect. If no improvement, discontinue. Monitor ALT and AST during long-term therapy – rare cases of drug-induced hepatitis on curcumin are reported, especially with enhanced-bioavailability formulations. Monitor INR in patients on warfarin – curcumin can enhance the anticoagulant effect.

Food and drinks

Dietary source: turmeric root (spice). 1 teaspoon (3 g) of dried turmeric contains 60–100 mg curcuminoids. Bioavailability from the spice is low without combination with fat and black pepper (piperine). In Indian and Thai cuisines, turmeric is regularly added to curries and stews – estimated average intake in these regions is 60–100 mg curcuminoids daily. Intake in other regions is much lower.

Common myths

Myth: “curcumin treats everything – from cancer to depression”. Fact: laboratory data on antitumour, anti-inflammatory, and neuroprotective effects do not translate to clinical practice. Pure curcumin bioavailability is less than 1%, and systemic concentrations at standard doses are insufficient to reproduce in vitro effects.

Myth: “curcumin with piperine is a mandatory combination”. Fact: piperine increases curcumin bioavailability 20-fold, but is also a potent CYP3A4 and P-glycoprotein inhibitor. This creates a risk of drug interactions with many medicines (statins, immunosuppressants, antidepressants, warfarin). In polypharmacy, the curcumin+piperine combination requires caution.

Myth: “golden milk heals joints”. Fact: the effect of dietary turmeric on joints is clinically minor. The curcuminoid dose in a standard cup of golden milk is 50–100 mg, 5–15 times less than RCT-tested doses. With osteoarthritis and pain, consult a clinician for standard therapy, not spices.

Drug–drug interactions

3 pairs found. Sorted from critical to minor.

ModerateBlack cohosh (Cimicifuga racemosa)Herbal product for menopausal symptoms (food supplement under Spanish RD 1487/2009)

Mechanism

Both herbs appear among the plant causes of liver injury reported in Europe. Black cohosh carries an public statement for serious hepatic reactions; curcumin, especially in high-bioavailability formulations with piperine, has accumulated reports of cholestatic hepatitis. Neither label warns about the other, and someone going through menopause with joint pain may end up taking both.

Symptoms

Jaundice, itching, dark urine, right upper quadrant pain, marked fatigue. In cholestatic hepatitis, itching can precede jaundice by several weeks.

Management

Avoid stacking two herbs with a hepatic signal in the same regimen, especially alongside alcohol, regular paracetamol or a statin. If both are taken, get baseline liver tests and repeat at two or three months. With any symptom, stop both at once and work out which one it was afterwards.

Sources

Pair details →Black cohosh (Cimicifuga racemosa) →

MinorIron oral (salts: sulfate, bisglycinate, fumarate, gluconate, polymaltose; heme iron polypeptide, lactoferrin)Oral iron preparations; antianaemic agents

Mechanism

Curcumin binds iron in the laboratory and reduces liver and spleen stores in animal models, which raised the fear that it would ruin anaemia treatment. The randomised trial that tested this in healthy adults found no impairment of acute iron absorption with bioavailable curcumin, at any of the ferrous sulphate doses studied. The concern has a biochemical basis, not a clinical one.

Symptoms

No clinical picture from this combination has been described in humans.

Management

There is no need to stop curcumin because of iron. In someone with low ferritin on active anaemia treatment, the sensible step is to check ferritin at 8–12 weeks as in any other case, without attributing a slow response to curcumin in advance when it usually has other causes: poor tolerance, dosing with dairy, or unidentified bleeding.

Sources

Pair details →Iron oral (salts: sulfate, bisglycinate, fumarate, gluconate, polymaltose; heme iron polypeptide, lactoferrin) →

MinorParacetamolAnilides. Analgesics and antipyretics

Mechanism

Curcumin (Curcuma longa extract) theoretically weakly inhibits CYP2E1, which produces paracetamol's hepatotoxic metabolite NAPQI. For short paracetamol courses, hepatotoxicity risk may be slightly reduced. Clinical data are limited.

Symptoms

The combination usually causes no specific symptoms. Each drug's individual side effects remain.

Management

No dose adjustment needed. Dietary curcumin (curry, golden milk) does not clinically affect paracetamol metabolism. At supplement doses of curcumin (500–1000 mg/day), no clinically significant interaction has been documented. Paracetamol limit: up to 3 g/day.

Sources

FDA: Tylenol 8 HR Arthritis Pain (acetaminophen) – label (2020)

Pair details →Paracetamol →

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Frequently asked

What is Curcumin (Curcuma longa extract) used for?

Curcumin (Curcuma longa extract) is evaluated for the following indications with varying evidence strength: Major depressive disorder (evidence tier C), Ulcerative colitis remission maintenance (evidence tier D), Knee osteoarthritis (evidence tier D). See the full indication matrix with dosing and citations above on this page.

What are the side effects of Curcumin (Curcuma longa extract)?

Common side effects of Curcumin (Curcuma longa extract) (≥ 1 in 100): Nausea, epigastric discomfort, Diarrhoea at high doses, Yellow stool discoloration. See the Safety section for uncommon and serious reactions.

Is Curcumin (Curcuma longa extract) safe during pregnancy?

Turmeric at culinary doses is safe. High-dose curcumin supplements in pregnancy are not recommended – there are theoretical data on uterine contractility stimulation and bleeding risk.

Is Curcumin (Curcuma longa extract) compatible with breastfeeding?

Turmeric at culinary doses is safe. High-dose curcumin supplements during breastfeeding are not recommended.

Who should not take Curcumin (Curcuma longa extract)?

Curcumin (Curcuma longa extract) is contraindicated in: Hypersensitivity to curcumin or turmeric; Pregnancy and breastfeeding; Active cholelithiasis; Acute cholangitis, biliary obstruction; Severe liver disease. Full list in the Safety section.

“curcumin treats everything – from cancer to depression”

laboratory data on antitumour, anti-inflammatory, and neuroprotective effects do not translate to clinical practice. Pure curcumin bioavailability is less than 1%, and systemic concentrations at standard doses are insufficient to reproduce in vitro effects.

“curcumin with piperine is a mandatory combination”

piperine increases curcumin bioavailability 20-fold, but is also a potent CYP3A4 and P-glycoprotein inhibitor. This creates a risk of drug interactions with many medicines (statins, immunosuppressants, antidepressants, warfarin). In polypharmacy, the curcumin+piperine combination requires caution.

“golden milk heals joints”

the effect of dietary turmeric on joints is clinically minor. The curcuminoid dose in a standard cup of golden milk is 50–100 mg, 5–15 times less than RCT-tested doses. With osteoarthritis and pain, consult a clinician for standard therapy, not spices.

Other drugs in this group

Diosmectite, Lactobacillus rhamnosus GG (LGG), Loperamide, Mesalazine, Probiotics (Lactobacillus spp., Bifidobacterium spp., Saccharomyces boulardii), Sulfasalazine, Nifuroxazide, Nystatin