Curcumin (Curcuma longa extract)

Herbal anti-inflammatory agents

ATC code: A07XA-CURCUMIN (Curcumin (Curcuma longa extract) – local code)

Brand names – supplements

Curcumin C3 Complex, Meriva (Indena), Theracurmin HP, Thorne Meriva 500-SF, Doctor's Best High Absorption Curcumin

Supplements are not tested in clinical trials and are not registered as medications.

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.

Indications

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, , NSAIDs, intra-articular injections when needed, and joint replacement.

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.

Frequently asked

What is Curcumin (Curcuma longa extract) used for?

Curcumin (Curcuma longa extract) is evaluated for the following indications with varying evidence strength: Ulcerative colitis remission maintenance (evidence tier D), Knee osteoarthritis (evidence tier D), Cancer prevention (evidence tier F). 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?

FDA category C. 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.

Curcumin (Curcuma longa extract)

Mechanism of action

Indications

Knee osteoarthritis

Ulcerative colitis remission maintenance

Anti-aging, longevity, and quality-of-life enhancement in healthy adults

Cancer prevention

Major depressive disorder

Practical notes

Timing and administration

Dose titration

Monitoring

Food and drinks

Common myths

Safety

Contraindications

Serious adverse effects

Common adverse effects

Uncommon adverse effects

PregnancyFDA C

Breastfeeding

Frequently asked