Curcuma longa (rhizome)

Turmeric

Turmeric-based products have reduced knee osteoarthritis pain more than placebo in short trials, but almost all of that evidence is for concentrated curcumin extracts rather than the spice or whole-root powder, and the reviews rate its certainty as low. The EU regulator accepts turmeric root only for mild indigestion, on traditional use rather than trial proof.

The main caution is liver injury: US and Italian case reports link turmeric supplements to serious hepatitis, and one death occurred in a ten-case US series.

Written by

Healthy and Herbal editorial team

Reviewed by

Healthy and Herbal editors

Updated

10 October 2026

Fresh turmeric root cut open, with ground turmeric

At a glance

Last reviewed 10 October 2026

Evidence

Limited

Best for

Knee osteoarthritis pain

Typical form & use

Root powder, 0.5–1 g, 2–3 times daily

Onset

4+ weeks

Safety

Rare liver injury reported with supplements. No interactions in our data.

Check with your medications →

What it's used for

Evidence is rated per use. The same ingredient can be strong for one thing and traditional for another.

Use	Evidence	What the research shows
Knee osteoarthritis pain and functionCompare remedies for joints and inflammation →	Limited	Systematic reviews of randomised trials find turmeric products beat placebo for knee pain and function: 16 trials in 1,810 adults lasting up to 16 weeks gave a standardised mean difference of −0.82 for pain, with very high heterogeneity (I² 86%), and similar results to NSAIDs. A 2025 network meta-analysis of 17 trials rated the certainty of evidence as low. The trials mostly tested curcumin or curcuminoid extracts, not culinary turmeric or plain root powder, so these results do not show that the spice works. NCCIH says the initial evidence is positive but higher-quality research is needed.^4,5,6,1
Mild indigestion (fullness, slow digestion, wind)Compare remedies for digestion →	Traditional	The EU regulator (HMPC) recognises turmeric root powder, tea and extracts for mild digestive problems on traditional use alone, because clinical studies had design shortcomings and only one had a control group. A 2024 systematic review of 26 studies, most at high risk of bias, found possible benefit in irritable bowel syndrome and inflammatory bowel disease but inconsistent results for other digestive conditions, and said efficacy remains unclear.^2,3,7

Use

Evidence

What the research shows

Knee osteoarthritis pain and functionCompare remedies for joints and inflammation →

Limited

Systematic reviews of randomised trials find turmeric products beat placebo for knee pain and function: 16 trials in 1,810 adults lasting up to 16 weeks gave a standardised mean difference of −0.82 for pain, with very high heterogeneity (I² 86%), and similar results to NSAIDs. A 2025 network meta-analysis of 17 trials rated the certainty of evidence as low.

The trials mostly tested curcumin or curcuminoid extracts, not culinary turmeric or plain root powder, so these results do not show that the spice works. NCCIH says the initial evidence is positive but higher-quality research is needed.^4,5,6,1

Mild indigestion (fullness, slow digestion, wind)Compare remedies for digestion →

Traditional

The EU regulator (HMPC) recognises turmeric root powder, tea and extracts for mild digestive problems on traditional use alone, because clinical studies had design shortcomings and only one had a control group.

A 2024 systematic review of 26 studies, most at high risk of bias, found possible benefit in irritable bowel syndrome and inflammatory bowel disease but inconsistent results for other digestive conditions, and said efficacy remains unclear.^2,3,7

How much

Ranges below are what studies used and what supplements commonly contain. They are not a recommendation for you. Start at the low end.

EU powder dose

0.5–1 g, 2–3 times daily²

The HMPC traditional-use dose of powdered root for adults with mild digestive complaints. Seek advice if symptoms last longer than 2 weeks.

EU herbal tea

0.5–1 g root in 150 ml boiling water, 2–3 times daily²

As an infusion. Extracts and tinctures have their own listed doses in the monograph and are not interchangeable with powder.

Osteoarthritis trials

Not established for powder^5,1

Reviewers say the best dose, frequency and formulation are still unclear, and the trials used extracts of varying curcumin content, so no powder dose for joint pain can be given.

Duration

Up to 2–3 months^1,4

NCCIH says conventional oral turmeric or curcumin is likely safe in recommended amounts for up to 2 or 3 months. The osteoarthritis trials lasted up to 16 weeks.

Timing · No source gave timing advice for turmeric root powder.With food? · No source we opened gave food guidance. NCCIH lists nausea, acid reflux, stomach upset, diarrhoea and constipation as possible effects, so stomach upset is a reason to stop rather than to work around it.How long to trial · For digestion, the EU monograph says to see a doctor or qualified practitioner if symptoms last longer than 2 weeks or get worse. For joints, trials ran up to 16 weeks, so a month is a fair minimum to judge any change.

How people take it

Root powder (spice)0.5–1 g, 2–3 times daily (EU)The form in the EU traditional-use monograph. Not the form tested in most osteoarthritis trials.

Herbal tea (infusion)0.5–1 g root in 150 ml boiling waterTraditional use only, as listed in the EU monograph.

Standardised extract capsuleVaries by product; check the labelThe form most trials tested, and it is a curcumin product rather than turmeric root. NCCIH notes that products vary in curcumin content and often add piperine from black pepper.

Safety

Who should avoid

Liver disease, bile-duct obstruction, gallstones — EU regulator advises against
Pregnancy and breastfeeding — safety not established, EU regulator advises against
Children and adolescents under 18 — not recommended, too little data
Anyone with jaundice, dark urine or unusual fatigue while taking it — stop and seek care
Known hypersensitivity to turmeric

Known interactions

No interactions in our data. Absence of a flag is not clearance.

Compare with

Head-to-head pages for the pairs people search most.

Turmeric vs Curcumin Turmeric vs Ginger

Questions people ask

Does turmeric work for arthritis pain?

Trials of turmeric and curcumin extracts show less knee osteoarthritis pain than placebo, but the evidence is short-term, varies a lot between studies and is rated low certainty. Almost none of it tests cooking turmeric or plain root powder, so the spice itself has not been shown to help.

Can turmeric damage the liver?

Rarely, but seriously. A US network reviewed ten turmeric-associated liver injury cases from 2004 to 2022: five people were hospitalised and one died of acute liver failure, and 7 of 10 carried the gene variant HLA-B*35:01.

NCCIH says liver damage has been reported with the highly bioavailable formulations and advises stopping if fatigue, nausea, poor appetite, dark urine or jaundice appear.

Is turmeric good for digestion?

The EU regulator accepts turmeric root for relief of mild fullness, slow digestion and flatulence based on long use, not trial proof. A 2024 review of 26 mostly poor-quality studies found possible benefit in irritable bowel syndrome and inflammatory bowel disease, but concluded efficacy is unclear.

Is turmeric the same as curcumin?

No. Curcumin is the main yellow compound in turmeric, and it is the one most research has tested, usually as a concentrated extract. NCCIH notes that curcuminoids are the components commonly credited for turmeric's health effects, so results for extracts cannot be assumed for the spice.