Know2eat

Turmeric extract (curcumin)

Curcuma longa

Herbs & Botanicals

What turmeric extract (curcumin) may help with

Ranked by how strong the human evidence is — best supported first.

Best supportedJoint comfortModerate evidence· 3 sources

Then, in order

About Turmeric extract (curcumin)

A concentrated extract of turmeric rhizome, usually standardised to 95% curcuminoids — a mixture of curcumin, demethoxycurcumin and bisdemethoxycurcumin. Raw turmeric powder is only around 2–5% curcuminoids.

Curcumin has thousands of papers behind it and a persistent problem: it is poorly absorbed, rapidly metabolised, and behaves as a promiscuous hitter in laboratory assays, which produces impressive in vitro results that rarely survive contact with human trials. The human literature that does exist is dominated by small trials from a handful of countries with signs of publication bias, and the bioavailability-enhanced products used in research are chemically distinct formulations that cannot be dose-matched to plain 95% extract.

Sold as
95% curcuminoid extract, Phytosome complex, Nanoparticle formulation, Curcumin with piperine, Turmeric powder
Standardised to
Usually 95% curcuminoids; enhanced-absorption products state their own delivery system — a product without this marker may not resemble what was studied.
Also known as
Curcumin, Curcuminoids, Turmeric extract, Haldi extract

What the research used

The amounts, forms and durations published trials of Turmeric extract (curcumin) actually administered.

These are the amounts published trials administered — not a recommendation, and not a dose to copy. Trial participants were screened, supervised and given a characterised preparation. What is in a retail bottle is frequently not what was studied, and the amount that suits one person is not general advice.

  • Studied for Knee osteoarthritis symptoms

    500–1500 mg

    Limited

    Standardised curcuminoid extract, divided doses · 95% curcuminoids, frequently with 5–20 mg piperine · 6–12 weeks

    Trials are small, mostly from India, Iran and Thailand, and many were supported by extract manufacturers. Meta-analyses of this literature show funnel-plot asymmetry consistent with missing negative studies.

  • Studied for Inflammatory and metabolic markers

    80–2000 mg

    Limited

    Ranges from 80 mg of a nanoparticle formulation to 2 g of plain extract · 8–12 weeks

    The hundred-fold spread reflects formulation, not dose-finding. A phytosome or nanoparticle product at 200 mg may deliver more curcumin to blood than 2 g of unformulated extract, so milligram comparisons across products are meaningless.

This is general information about food, not medical advice. It cannot diagnose, treat or replace guidance from a clinician who knows your history.

When it was taken

Each window says whether a trial compared it against an alternative, or whether it is convention and pharmacology. Most timing advice is the second kind.

1 of 2 timings below were actually compared in a trial. The rest reflect convention or pharmacology.

  • With food

    Moderate

    Pharmacokinetic studies show curcumin absorption is higher when taken with fat and with piperine, which is why nearly every product includes one or the other. This is one of the few timing points in the category with actual measurement behind it.

    Timing was tested. A trial compared this window against another and reported a difference.

  • Split through the day

    Not enough

    Trials commonly split the daily amount in two or three because plasma curcumin falls quickly. Split versus single dosing has not been compared for outcomes.

    Timing was not directly compared. This reflects convention or how the compound behaves in the body, not a trial showing this window works better.

The evidence in depth

Best supported: Moderate

What each association actually rests on, and the papers behind it. A rating describes the state of the research, not how promising the supplement sounds. How we rate evidence.

Joint comfort

Joint Health
Moderate evidence

Several randomised trials report reduced knee osteoarthritis pain scores compared with placebo, with some trials finding it comparable to non-steroidal anti-inflammatories over short periods. Confidence is held back by small samples, short follow-up, frequent industry funding and clear signs of publication bias in the pooled data.

What may be going on: Curcuminoids inhibit NF-κB signalling and eicosanoid synthesis in cell models, though systemic exposure after oral dosing is very low.

Moderate evidence. Several human studies point the same way, with real caveats.

View the 3 sources

Deep research mode adds each paper’s own conclusion and stated limitations.

Blood lipid profile

Heart Health
Limited evidence

Some trials report modest falls in triglycerides and small changes in LDL cholesterol. Results vary widely between formulations and populations, and the better-controlled trials tend to show less.

Limited evidence. Early human work, or mostly lab and animal research.

View the 1 source

Deep research mode adds each paper’s own conclusion and stated limitations.

Inflammatory markers

Inflammation
Limited evidence

Pooled trials report reductions in C-reactive protein and IL-6, mainly in people with raised markers to begin with. Whether moving those numbers changes how anyone feels or what happens to them later is untested.

Limited evidence. Early human work, or mostly lab and animal research.

View the 4 sources

Deep research mode adds each paper’s own conclusion and stated limitations.

Mood

Mental Wellbeing
Not enough evidence

Evidence is limited for curcumin and depressive symptoms. The trials are few, small and mostly from one region, and this is not a substitute for care from a clinician.

Not enough evidence. Not enough human research to say anything useful yet.

View the 3 sources

Deep research mode adds each paper’s own conclusion and stated limitations.

Things to know

Interactions, contraindications and dose limits, most serious first. Concentrated extracts interact with medication in ways the whole plant does not, so this section carries more weight here than it does on a food page.

  • Worth knowing

    Liver injury reports, especially with enhanced-absorption products

    Clusters of acute hepatitis linked to curcumin supplements have been reported in Italy, Australia and the US, most often with high-bioavailability formulations. Some cases involved people carrying a particular HLA type. Jaundice, dark urine or unexplained fatigue means stopping and seeking review.

  • Interaction

    Bleeding risk and piperine-driven drug interactions

    Interacts withWarfarin, antiplatelet drugs, CYP3A4 substrates, phenytoin, propranolol

    Curcumin inhibits platelet aggregation, and the piperine added to most products inhibits drug-metabolising enzymes, which can raise blood levels of medicines including some antiepileptics, beta-blockers and immunosuppressants. Both are reasons to involve a prescriber.

  • Worth knowing

    Iron absorption and gallbladder disease

    Curcumin binds iron and case reports describe worsening iron deficiency at high intakes. It also stimulates gallbladder contraction, which is a problem for anyone with gallstones or bile duct obstruction.

  • Worth knowing

    Adulteration with synthetic dyes

    Turmeric and curcumin products have been found adulterated with lead chromate for colour, a documented source of lead exposure, and with synthetic curcumin passed off as natural extract.

  • Avoid

    Pregnancy at supplemental doses

    Culinary turmeric is a normal part of many diets, but concentrated extracts have uterine-stimulant activity in animal work and are generally avoided in pregnancy.

  • Worth knowing

    Stop before surgery

    Because of the platelet effect, curcumin is usually on the list of supplements to stop one to two weeks before planned surgery.

In the food catalogue

The whole-food form, where one exists. The evidence for a concentrated extract rarely transfers to the food, or the other way round — these are cross-links, not equivalents.

Black pepperSource of piperine, which is added to many curcumin products to slow…TurmericThe whole spice the extract is concentrated from, at roughly a…

Evidence ratings on this page: 1 moderate evidence, 2 limited evidence, 1 not enough evidence.

Supplements are sold in the US without pre-market review of efficacy or safety. Nothing on this page is a recommendation to take Turmeric extract (curcumin), or a dose to follow.