Turmeric (Curcuma longa)

Turmeric is the bright-yellow root (rhizome) of the Curcuma longa plant — the same spice that colours curry. People take it mainly for joint pain, especially osteoarthritis of the knee. The part most studied is a family of plant compounds called curcuminoids (curcumin is the main one). There is no UK-authorised health claim for turmeric or curcumin, so a supplement label cannot lawfully make a treatment claim; this page describes the evidence and the official UK position without making a claim. The clearest practical point for a buyer: a "turmeric" capsule and a "95% curcumin extract" capsule are very different products, and curcumin on its own is poorly absorbed unless it is paired with black pepper (piperine) or sold in an absorption-enhanced form.

Camden Medicals editorial · Last reviewed 12 June 2026 · Next review December 2026

  • Cross-checked against
  • NHS
  • NICE
  • BNF
  • EFSA
  • FSA
Verifera Evidence ReviewCamden’s own editorial review · evidence-graded, verification in progress — graded, not guessed.

Camden's own editorial team graded each health claim below on the strength of the published evidence — trials weighed with Cochrane RoB 2, systematic reviews with AMSTAR 2, under the CEGA method. See the grade beside every condition.

Class
Botanical
Typical daily dose
Studied range in osteoarthritis trials: standardised curcuminoid extract 1,000–1,500 mg/day. Raw turmeric powder would need much higher amounts (3–8 g/day) for an equivalent curcuminoid intake. Piperine 5–20 mg co-administered raises absorption markedly. This describes the doses studied, not a recommendation.
Top use evidence
Limited
On this page
  1. What it is
  2. At a glance
  3. What people use it for
  4. How it works
  5. Common myths
  6. Common online questions
  7. The official position
  8. What the guidance says
  9. Camden's evidence review
  10. Effect matrix — per-condition evidence
  11. Safety, interactions & who should avoid it
  12. How to take it
  13. How to spot quality
  14. Commonly combined with
  15. Related ingredients
  16. Sources

What it is

Turmeric is the dried, ground root (rhizome) of Curcuma longa — the spice that gives curry powder its colour. The root contains starch, fibre, essential oils (turmerones), and curcuminoids: curcumin (~75% of total), demethoxycurcumin (~15%), and bisdemethoxycurcumin (~10%). Total curcuminoid content of raw root is typically 2–8% by weight; standardised extracts concentrate this to 30–95%.
Curcumin is poorly absorbed when taken by mouth — most of an oral dose is rapidly broken down in the gut and liver and excreted. Several formulation strategies address this: piperine co-administration (BCM-95®), phospholipid complex (Meriva®, ~29× absorption in pharmacokinetic studies), nanoparticle preparation (Theracurmin®, ~27×), and water-dispersible formulations (NovaSOL®, BioCurc®). Raw turmeric powder with black pepper gets some of the way; absorption-enhanced formulations get further. (Note: the UK FSA Committee on Toxicity has flagged that piperine's effect on curcumin absorption is less consistent in recent studies than older work suggested — see the guidance section.)
Camden's encyclopaedia look-for bar is: curcuminoid % declared (≥95% curcuminoids is the research-grade extract; 30–50% is commercial mid-tier; raw root at ~3% is the spice). Absorption enhancer (piperine, phospholipid, nanoparticle) named where used.

At a glance

  • Turmeric is the root of Curcuma longa. The studied compounds are curcuminoids (curcumin is the main one), typically 2–8% of the raw root.
  • No UK-authorised health claim exists for turmeric or curcumin. The product label and page must stay descriptive — no treatment claims.
  • Most trials are in knee osteoarthritis pain at 1,000–1,500 mg/day of standardised curcuminoid extract; the most recent and most rigorous review rates the certainty of that evidence as low.
  • A 500 mg "turmeric powder" capsule and a 500 mg "95% curcuminoid extract" capsule are not the same product — they can differ ~10–40× in curcuminoid content.
  • Curcumin is poorly absorbed on its own. Black pepper (piperine) or an absorption-enhanced formulation raises blood levels markedly — and adds drug-interaction considerations. Talk to your pharmacist or GP if you take prescribed medicines.

What people use it for

  • Adults with mild-to-moderate osteoarthritis (especially of the knee)

    Joint pain is the most common reason people reach for turmeric, and it is where the human evidence is strongest — though "strongest" here still means limited. Trials of standardised curcuminoid extract at 1,000–1,500 mg/day over 8–12 weeks report pain reductions, but the most recent network meta-analysis rates the certainty of that evidence as low. The UK position puts exercise and weight management first (NICE NG226); turmeric is not on the NHS osteoarthritis pathway. Talk to your GP if joint pain is persistent or worsening — physiotherapy, joint injection, or surgery are NHS options. [6,7,9]

    Some evidenceLimited

  • People interested in metabolic / lipid markers

    Turmeric is sometimes taken for cholesterol, blood-sugar, or inflammatory markers. Reviews of curcumin at 500–1,000 mg/day report modest changes in some of these markers, but the trials are small and mixed and this use is not on any UK guidance pathway. Diet, physical activity, and statins where a clinician indicates them remain the foundation. [10]

    Popular, not provenLimited

  • Anyone taking blood-thinners or with planned surgery

    This is a safety point, not a use. Curcumin has documented antiplatelet activity. Stop turmeric supplements at least 1 week before any planned surgery, including dental extractions, and tell your anaesthetist. Talk to your prescriber before use if you take warfarin, DOACs, aspirin, clopidogrel, or other anticoagulants or antiplatelets.

    Not supportedInsufficient

  • Anyone with gallbladder disease or biliary obstruction

    A safety point. Talk to your GP first. Turmeric increases bile flow (a traditional cholagogue use), which can worsen symptoms in gallstone disease or biliary obstruction.

    Not supportedInsufficient

How it works

Curcumin has documented effects in laboratory models on several inflammation pathways — NF-κB inhibition, COX-2 modulation, reduced release of inflammatory signalling proteins (TNF-α, IL-1β, IL-6), and activation of the Nrf2 antioxidant pathway. These are cell- and animal-model findings; how completely they translate to benefit in people is the open question that the human trials below try to answer. The best-characterised human signal is in osteoarthritis pain. Effects studied in other inflammatory conditions (rheumatoid arthritis, inflammatory bowel disease, metabolic markers) are smaller and less consistent.

Common myths

Myth"Turmeric powder is the same as a curcumin extract."

RealityNot by curcuminoid content. A 500 mg turmeric powder capsule delivers roughly 10–40 mg total curcuminoids; a 500 mg 95% curcuminoid extract capsule delivers roughly 475 mg. The trial evidence is on standardised extracts, not on raw root powder.

Myth"Turmeric is a liver-cleansing herb."

Reality"Liver cleansing" is not a recognised medical process. Turmeric does increase bile flow (a cholagogue effect), which is why it is cautioned in biliary obstruction. A healthy adult liver does not need supplemental cleansing.

Myth"Turmeric is risk-free because it is a spice."

RealityCulinary use is small-dose exposure with broad safety. Concentrated supplemental extracts are a different exposure with documented antiplatelet activity, drug-metabolism interactions (CYP3A4, CYP2C9), gallbladder considerations, and — flagged in the UK FSA Committee on Toxicity review — case reports of liver inflammation at high chronic doses, particularly with absorption-enhanced formulations.

Common online questions

Synthesised from the questions UK shoppers most often ask online about Turmeric (Curcuma longa). Each answer is editorial and links to its evidence in the Sources list below.

How much turmeric do people take for joint pain?

The doses studied in osteoarthritis trials are 1,000–1,500 mg/day of standardised curcuminoid extract (roughly 950–1,425 mg of total curcuminoids/day from a 95% extract). Raw turmeric powder would have to be taken at much higher amounts to match this. This is the studied range, not a recommendation — and the certainty of the evidence is low. If joint pain is persistent, your GP and the NHS osteoarthritis pathway are the right starting point. [6]

Does black pepper really make turmeric work better?

Black pepper supplies piperine, which in pharmacokinetic studies raises blood levels of curcumin substantially by slowing how fast the gut and liver break it down (Shoba 1998, PMID 9619120). Most research-grade turmeric supplements either include piperine or use a phospholipid or nanoparticle formulation to improve absorption another way. Worth knowing: the UK FSA Committee on Toxicity notes that more recent studies are less consistent about piperine's effect, and piperine also affects how some prescription medicines are processed — so talk to your pharmacist if you take any. [11]

Can I take turmeric with my warfarin?

Talk to your anticoagulation team before you do. Curcumin has documented antiplatelet activity and can interact with vitamin-K-antagonist anticoagulation. Even where the INR looks unchanged, the effect on platelets can raise bleeding risk. The conservative position is to avoid the combination unless it is specifically supervised.

Should I stop turmeric before surgery?

Yes — stop turmeric supplements at least 1 week before any planned surgery, including dental extractions, and tell your anaesthetist that you have been taking it. Antiplatelet activity is the main concern around surgery.

Is turmeric safe in pregnancy?

Turmeric as a culinary spice in food is fine. Concentrated supplemental extracts are best avoided in pregnancy: curcumin has a historic uterine-stimulant use in traditional medicine and there is limited safety data on supplement-grade extracts in pregnancy. Talk to your GP, midwife, or pharmacist before taking any supplement in pregnancy. [12]

⚖️ The official position

What may lawfully be claimed about Turmeric (Curcuma longa) in Great Britain. This is a regulatory position, not an evidence grade.

No health claim is authorised for Turmeric (Curcuma longa) in Great Britain.

This page describes the evidence and online discussion without making a claim.

UK regulatory landscape

UK regulatory tier: Food supplement

EFSA claim status

Turmeric / curcumin health claims (joint health, anti-inflammatory, antioxidant, liver health) sit on the EFSA "on-hold" list for botanicals. Pending claims may not be presented as authorised.

UK regulatory rules evolve. This summary is editorial — businesses should consult regulatory counsel; consumers should consult their pharmacist or GP.

🩺 What the guidance says

What UK and international health bodies say. Guidance leads; Camden’s own evidence review follows below.

  • NHSNot assessed

    NHS — Osteoarthritis (diagnosis and treatment)

    The NHS describes osteoarthritis as a common joint condition managed mainly with regular exercise, keeping to a healthy weight, and pain relief, with physiotherapy, supported self-management, and — in more severe cases — joint surgery available on the NHS. The NHS osteoarthritis pages do not list turmeric or curcumin as a treatment. Anyone with persistent or worsening joint pain is directed to their GP rather than to a supplement.

    Read the guidance →

  • NICENot assessed

    NICE NG226 — Osteoarthritis in over 16s: diagnosis and management

    NICE makes therapeutic exercise and weight management (where appropriate), with information and support, the core treatments for osteoarthritis, and says any medicine should be at the lowest effective dose for the shortest time alongside those core treatments. NICE explicitly advises against offering glucosamine, telling people who ask that there is no strong evidence of benefit. The guideline does not assess or list turmeric or curcumin, so there is no NICE recommendation for its use.

    Read the guidance →

  • SOCIETY-OTHERConditional

    Versus Arthritis — Turmeric (complementary and alternative treatments)

    Versus Arthritis, the UK arthritis charity, says there is only limited trial evidence that turmeric helps in osteoarthritis, that it appears to cause only minor side-effects, and that human trials have not found it toxic at 1–10 g a day. It cautions that because turmeric can thin the blood it should be avoided by people on anticoagulants or with bleeding disorders, and that it can interact with medicines for diabetes, cancer, and immune suppression — so medical advice matters. The charity frames turmeric as a possible modest, limited-evidence option, not an established treatment.

    Read the guidance →

  • EFSANot assessed

    EFSA — Scientific opinion on the re-evaluation of curcumin (E 100) as a food additive

    EFSA's food-additives panel re-evaluated curcumin (the colour E 100), concluded it is not genotoxic, and confirmed an acceptable daily intake of 3 mg per kilogram of bodyweight per day. This is a food-additive safety opinion, not an assessment of any health benefit; EFSA has not issued a positive opinion supporting a turmeric or curcumin health claim, and such claims sit on the EU "on-hold" botanicals list. The ADI is a useful safety anchor: some concentrated supplements can exceed it.

    Read the guidance →

  • GB-NHCNot assessed

    Great Britain Nutrition and Health Claims (NHC) Register

    Only health claims on the GB Nutrition and Health Claims Register may be made for a food or food supplement sold in Great Britain. The register holds no authorised claim for turmeric or curcumin, so no health benefit may be claimed for it on a food-supplement basis. The register is the authoritative reference for what may and may not be said on a label or page.

    Read the guidance →

  • GOVUKNot assessed

    FSA Committee on Toxicity (COT) — discussion paper on the potential risk to human health of turmeric and curcumin supplements

    The UK Committee on Toxicity, which advises the Food Standards Agency, is reviewing the safety of turmeric and curcumin supplements. Its discussion paper flags reported cases of liver inflammation linked to curcumin supplements, notes that some supplements can deliver curcumin above the acceptable daily intake, observes that piperine's effect on absorption is less consistent in recent studies, and records occasional lead contamination in turmeric powder. The review is ongoing and has not reached final conclusions; Camden tracks this as a regulatory-watch item and applies the 6-month review cadence to this entry.

    Read the guidance →

🔬 Camden’s evidence review

The research Camden reviewed, graded on its strength. This is our own appraisal — it sits beneath the official guidance above, never above it.

  1. Osteoarthritis pain (chiefly knee)

    Evidencelimited

    UK guidance leads here, and it does not endorse turmeric. NICE (NG226) makes therapeutic exercise and weight management the core treatments for osteoarthritis, advises against glucosamine ("no strong evidence of benefit"), and does not list turmeric or curcumin; the NHS osteoarthritis pages point to exercise, weight, and standard pain relief. Versus Arthritis, the UK arthritis charity, describes only limited trial evidence for turmeric in osteoarthritis with mostly minor side-effects. Beneath that position, the research Camden reviewed is consistently positive but low-certainty: Daily 2016 (PMID 27533649) pooled eight RCTs and found turmeric extract at about 1,000 mg/day of curcumin reduced pain versus placebo while cautioning the trials were too few and too small for definitive conclusions; Bannuru 2018 (PMID 29622343, 11 RCTs, n=1,009) and Zeng 2021 (PMID 34017975, 15 RCTs, n=1,621) reached similar conclusions with low overall study quality; and the most recent and most rigorous synthesis, Wai 2025 (PMID 40731001), a network meta-analysis of 17 RCTs, found all turmeric preparations reduced WOMAC pain versus placebo — but rated the certainty of evidence "low and very low" for every significant outcome, with only absorption-enhanced preparations meeting the minimum clinically important threshold. Camden therefore grades this LIMITED, not moderate: the direction of effect is consistent, but the certainty the trialists themselves report is low and no UK body recommends it. [6,7,9,13]

  2. Inflammatory bowel disease (IBD) — adjunctive

    Evidencelimited

    UK guidance leads, and it does not include turmeric: no NICE pathway lists curcumin for ulcerative colitis or Crohn's disease, and IBD care is a specialist gastroenterology pathway. Beneath that, the research Camden reviewed is small-scale: some trials of curcumin as an add-on to mesalazine in ulcerative colitis report lower relapse rates, but the studies are few and small. Anyone considering curcumin alongside IBD medication should do so only with their gastroenterology team — it is not a substitute for prescribed treatment.

  3. Cardiovascular and metabolic markers

    Evidencelimited

    UK guidance leads, and there is none specific to turmeric here: it is not on any NICE cardiovascular-risk pathway. Beneath that, the research Camden reviewed (e.g. the Heidari 2023 review of curcumin-piperine, PMID 36720711) reports modest, inconsistent changes in LDL-cholesterol, triglycerides, and inflammatory markers across small trials. This is not a basis for using turmeric in place of established cardiovascular care. [10]

  4. Cancer prevention or treatment

    Evidenceinsufficient

    UK guidance leads and is unambiguous: no NHS or NICE pathway supports turmeric or curcumin for cancer, and the GB Nutrition and Health Claims Register holds no such claim. Beneath that, despite extensive laboratory and animal data, there is no clinical evidence that curcumin is effective against cancer in people. Any cancer framing on a selling page is a medicine-by-presentation breach.

Effect matrix — per-condition evidence

Per-outcome summary of the published trial corpus: dose ranges studied, duration, evidence grade, and direction of effect. Each row is a citable claim.

OutcomePopulationDoseDurationEvidenceDirectionSources
Knee osteoarthritis painadults1000–1500 mg8–12 wkEvidencelimitedimprovementPMID 27533649 PMID 40731001 PMID 29622343 PMID 34017975
Studied dose range is standardised curcuminoid extract 1,000–1,500 mg/day. Daily 2016 (8 RCTs), Bannuru 2018 (11 RCTs), and Zeng 2021 (15 RCTs) report pain reduction versus placebo with low overall study quality; the Wai 2025 network meta-analysis (17 RCTs) confirms the direction but rates certainty low/very-low, with only absorption-enhanced preparations reaching the minimum clinically important difference. UK NICE NG226 puts exercise + weight management first; turmeric is not on the NHS pathway.

Evidence grades run Strong › Moderate › Limited › Very limited › Insufficient. Direction is the consensus of the published trials: improvement, no change, mixed, or decrement. A row marked Adverse effect is graded on the strength of the evidence of harm, not of benefit.

Safety

Turmeric / curcumin extract has documented antiplatelet activity. Stop at least 1 week before any planned surgery. Talk to your pharmacist or GP before use if you take prescribed medicine, have gallbladder disease or biliary obstruction, or are pregnant or breastfeeding.

Talk to your pharmacist or GP first if you:

  • You take warfarin, DOACs, aspirin, clopidogrel, or any antiplatelet / anticoagulant — bleeding-event risk.
  • You take diabetes medication (insulin, sulfonylureas) — possible additive glucose-lowering.
  • You take iron supplements — turmeric reduces non-haem iron absorption when taken concurrently.
  • You have any planned surgery in the next 14 days — stop at least 1 week before and tell your anaesthetist.
  • You have gallbladder disease, biliary obstruction, or gallstones.
  • You take medicine processed by the liver enzymes CYP3A4 or CYP2C9 — turmeric and piperine can affect these.
  • You are pregnant or breastfeeding — culinary use is fine; concentrated extracts: avoid.

Common side effects: Mild stomach symptoms (nausea, indigestion) at higher doses. Yellow stool / urine staining is harmless. Allergic reactions can occur in people allergic to the ginger (Zingiberaceae) family.

Pregnancy and breastfeeding

Culinary use is fine. Concentrated supplemental extracts: avoid in pregnancy. Talk to your GP, midwife, or pharmacist before taking any supplement in pregnancy.

Culinary use is fine. Concentrated extracts: limited data; talk to your pharmacist.

Talk to your GP, midwife, or pharmacist before starting any supplement during pregnancy or breastfeeding.

More clinical detail (for clinicians and informed readers)

Contraindications

  • Active biliary obstruction or symptomatic gallstones.
  • Pregnancy (concentrated supplemental extracts).
  • Active bleeding disorder or scheduled surgery within 14 days.
  • Known Zingiberaceae (ginger family) allergy.

Drug interactions

  • Warfarin, DOACs — antiplatelet pathway; bleeding-event case reports.
  • Aspirin, clopidogrel, antiplatelets — additive bleeding risk.
  • NSAIDs — additive stomach / bleeding risk.
  • Diabetes medication — possible additive glucose-lowering.
  • Iron supplements — reduces non-haem iron absorption when taken concurrently.
  • Medicines processed by CYP3A4 / CYP2C9 — turmeric / piperine can affect these enzymes; clinical significance varies.

This is not an exhaustive list. Always tell your prescriber and pharmacist about every supplement you take.

Common side effects

  • Mild stomach symptoms — nausea, indigestion, loose stools at higher doses.
  • Yellow staining of stool, urine, skin (harmless).

Rare side effects

  • Liver inflammation (hepatotoxicity) — case reports at high chronic doses, particularly with absorption-enhanced formulations; under review by the UK FSA Committee on Toxicity. Suspected reactions can be reported via the MHRA Yellow Card scheme.
  • Bleeding events at high doses.
  • Allergic reactions in people allergic to the ginger (Zingiberaceae) family.

How to take it

Typical supplemental range
Studied range in osteoarthritis trials: standardised curcuminoid extract 1,000–1,500 mg/day. Raw turmeric powder would need much higher amounts (3–8 g/day) for an equivalent curcuminoid intake. Piperine 5–20 mg co-administered raises absorption markedly. This describes the doses studied, not a recommendation.
Timing
With food, ideally a meal containing some fat (curcumin is fat-soluble). Twice-daily dosing is common in trials.

How to spot quality

Look for

  • Curcuma longa named (not Curcuma zedoaria or other Curcuma species).
  • Curcuminoid percentage declared (95% is research-grade; 30–50% mid-tier; raw root ~3%).
  • Absorption strategy named — piperine + BioPerine®, phospholipid complex (Meriva®), nanoparticle (Theracurmin®), or water-dispersible (NovaSOL®, BioCurc®).
  • GMP-certified manufacture; ideally heavy-metals + lead testing (turmeric supply chain has documented lead-chromate adulteration in some markets — a point the UK COT review echoes).

Red flags

  • Generic "turmeric extract" with no curcuminoid % declared.
  • No absorption enhancer named (raw root powder is far less well absorbed than enhanced formulations).
  • Marketing implies "natural anti-inflammatory" claims or replacement of prescribed NSAIDs.
  • Marketing implies cancer prevention or treatment.
  • No heavy-metals / lead testing disclosure (turmeric adulteration is a documented industry issue).

Commonly combined with

Other ingredients that share a biological pathway, cofactor relationship, or evidence-backed protocol with this one. Mechanisms below cite primary physiology — not folk pairing. Doses are literature ranges, not recommendations. Talk to your pharmacist or GP before changing your stack, especially if you take prescription medication.

Black Pepper (Piper nigrum)

Strong evidence

The well-known absorption pairing — piperine raises curcumin blood levels substantially in pharmacokinetic studies.

Curcumin (the principal curcuminoid in turmeric) is poorly absorbed orally — extensive gut and liver glucuronidation and sulfation eliminate most of an oral dose before it reaches the bloodstream. Piperine, the principal alkaloid in black pepper, inhibits glucuronyl-transferase activity in the gut wall and liver, slowing curcumin metabolism and raising plasma curcumin levels markedly (Shoba 1998 reported a large increase in human volunteers). The pairing is the basis of every commercial curcumin formulation that lists "BioPerine" or "with black pepper extract." Piperine's enzyme inhibition is broad, so the combination warrants caution with several prescription medicines processed by the same pathways (warfarin, certain antidepressants, several anti-epileptics). The UK COT review notes recent studies are less consistent about the size of the absorption effect.

Evidence: Shoba 1998 (Planta Med) is the canonical bioavailability study — "Influence of piperine on the pharmacokinetics of curcumin in animals and human volunteers." The pharmacokinetic effect is large and reproducible; subsequent formulation work (phytosomes, micelles, nanoparticles) has improved curcumin absorption further. [11]

Doses studied: 500–1000 mg curcumin (≥95% curcuminoid extract) with 5–20 mg piperine (often as BioPerine®) daily, as used in studies; check for prescription-medicine interactions before starting

Warfarin / DOAC interaction

Milk Thistle (Silybum marianum)

Limited evidence

Liver and anti-inflammatory cluster pairing — silymarin and curcumin both have NF-κB-modulating mechanism, with overlapping but not identical trial bodies for chronic-liver-disease and inflammatory-condition use.

Both silymarin and curcumin (the principal active in turmeric, Curcuma longa) inhibit NF-κB signalling in cell-biology assays. Both have modest trial bodies in NAFLD with mixed results on ALT / AST liver enzymes. Both share the absorption problem — oral uptake of free curcumin and silymarin is limited; phospholipid-bound preparations (Meriva® curcumin phytosome, Siliphos® silybin phytosome) substantially improve absorption.
The combination appears in many UK liver-cluster supplements alongside black pepper (piperine) for absorption enhancement and (sometimes) NAC. Trial evidence specific to the combination is limited; each component has its own trial body. UK NICE does not include either in liver-disease pathways.

Evidence: Mechanism complementary on the NF-κB axis. Trial evidence for each component is mixed. Combination trials are essentially absent.

Doses studied: Milk thistle standardised extract 200-400 mg + turmeric standardised extract 500-1000 mg (95% curcuminoids) + black pepper 5-10 mg (piperine), 2× daily with food, as seen in commercial formulations.

MSM (Methylsulfonylmethane)

Limited evidence

Joint anti-inflammatory cluster — MSM + curcumin both feature in joint-support combinations with anti-inflammatory framing.

MSM provides organic sulphur with modest cytokine modulation; curcumin acts on the NF-κB pathway. Different mechanisms; complementary on the inflammation axis.

Evidence: Each has its own modest trial body; the combination has not been directly trialled.

Doses studied: 1000-3000 mg MSM + 500-1000 mg turmeric (95% curcuminoid) + black pepper 5-10 mg daily, as seen in commercial joint formulations.

Rosemary (Rosmarinus officinalis / Salvia rosmarinus)

Limited evidence

Polyphenol antioxidant cluster — rosemary + turmeric NF-κB / Nrf2 modulation overlap.

Rosemary supplies carnosic acid and carnosol; turmeric supplies curcumin. Both modulate NF-κB / Nrf2. Mechanism complementary in the spice / antioxidant cluster.

Evidence: Polyphenol cluster framing; combination not directly trialled.

Doses studied: Culinary intake; supplement-tier rosemary extract 200-400 mg + turmeric 500-1000 mg daily.

Related ingredients

Sources

Numbered references cited above plus general authoritative reading. Citations in the body link to the matching number here.

How to read these sources:

  • Tier 1 (UK authoritative): NHS, NICE, BNF, EFSA, FSA, GB NHC Register, SACN, MHRA.
  • Tier 2 (primary literature): peer-reviewed RCTs cited by PMID.
  • Tier 3 (mechanistic): in-vitro / animal-model literature — interpret with caveat.
  1. NHS — Osteoarthritis
  2. NICE NG226 — Osteoarthritis in over 16s: diagnosis and management
  3. Versus Arthritis — Turmeric
  4. EFSA — Re-evaluation of curcumin (E 100) as a food additive (EFSA Journal 2010;8(9):1679)
  5. FSA Committee on Toxicity — turmeric and curcumin supplements review
  6. Daily JW et al. (2016) — Efficacy of turmeric extracts and curcumin for joint arthritis (PMID 27533649)
  7. Wai HS et al. (2025) — Turmeric products for knee osteoarthritis: systematic review and network meta-analysis (PMID 40731001)
  8. MHRA Yellow Card — adverse drug reaction reporting
  9. PubMed PMID 29622343
  10. PubMed PMID 36720711
  11. PubMed PMID 9619120
  12. NHS — pregnancy › keeping well › have a healthy diet
  13. PubMed PMID 34017975

Verifera® is published by Camden Medicals — a UK supplement retailer. We have a commercial interest in some of the ingredients described here; we declare it on every page and our editorial process forbids adjusting copy to favour our own products. Read our editorial policy.

This page is information, not medical advice. Talk to your pharmacist or GP before starting any supplement, especially if you take prescribed medicines, are pregnant or breastfeeding, or have an existing condition.

Suspected side effects can be reported to the MHRA via the Yellow Card scheme: yellowcard.mhra.gov.uk