Turmeric
Ayurveda tradition
The bright yellow root behind curry, 4,000 years of Ayurvedic practice, and one of the most-studied - and most oversold - compounds in the supplement aisle. Here's the honest version: what curcumin actually is, why it barely absorbs without black pepper, what the joint trials really found, the liver caution nobody puts on the front of the box, and exactly what Health Canada lets us say. No hype, no BS.
In one minute
Turmeric is the root; curcumin is the compound inside it that nearly all the research is actually about.
Curcumin is poorly absorbed on its own. Black pepper's piperine raises blood levels a lot - which is why our capsules include it.
The strongest human evidence is for joint comfort, from randomised trials using roughly 1,000-1,500 mg of curcuminoids a day.
Health Canada permits antioxidant claims for turmeric, and a joint pain and inflammation claim for concentrated extracts at 1,500 mg curcuminoids per day.
Rare but real: there are documented case reports of liver injury linked to turmeric supplements, and since 2025 Health Canada requires a liver warning on the label.
Cooking with turmeric and taking a 95% curcumin extract are not the same thing - not remotely the same dose.
At a glance
History & natural history
Turmeric has been in continuous use for something like 4,000 years, which makes it one of the oldest continuously used medicinal plants on earth. Here's the fuller picture.
What it is and how it grows
Turmeric is Curcuma longa, a member of the ginger family. The part everyone uses is the rhizome - a knobbly underground stem, bright orange inside, that the plant uses to store energy. It's a tropical perennial that wants heat, humidity and rich soil, and it takes eight to ten months in the ground before harvest. India grows and consumes the overwhelming majority of the world's crop, with Erode in Tamil Nadu historically known as 'Turmeric City.' Curiously, cultivated turmeric barely sets viable seed - it's propagated by dividing the rhizomes, which means the plants growing today are, in a real sense, clones of plants farmers selected a very long time ago.
Haldi: food, medicine and ceremony at once
In India turmeric is haldi, and the line between kitchen, pharmacy and temple has never been drawn. It appears in Ayurvedic texts as a warming, bitter, drying herb used for digestion, skin, wounds and joints. It colours the daily dal. It's rubbed onto the skin of the bride and groom in the haldi ceremony before a Hindu wedding, both to make them glow and as a blessing. It dyes the robes of monks. In Traditional Chinese Medicine it's jiang huang, used to move blood and qi and to relieve pain - and Health Canada's monograph still lists those TCM uses today.
The dye that stains everything
The colour is the point and the problem. Curcumin is such a powerful pigment that turmeric has been used for centuries to dye cloth, and it is still used as a food colouring. It also stains countertops, fingernails, plastic containers and light-coloured clothing more or less permanently. Fun aside: turmeric paper is a real chemistry reagent - it turns from yellow to reddish-brown in the presence of alkali.
From spice to supplement
The modern chapter starts in the laboratory. Curcumin was first isolated in the nineteenth century and its structure worked out in 1910, but the supplement boom is much more recent. Research into curcumin's anti-inflammatory and antioxidant behaviour accelerated through the 1970s and 1980s, and by the 2000s turmeric had become one of the best-selling herbal supplements in North America - the number one seller in the US natural products channel in some years. That popularity brought both the standardised 95% extracts that make clinical doses possible and, as regulators in Canada, Australia, Italy and France have all now noted, a small but real signal of liver injury that culinary turmeric never produced.
Adulteration: an old problem
Because turmeric is valued for its colour, it has a long and unhappy history of being brightened with things that shouldn't be there - including lead chromate, a vivid yellow pigment that has been found in turmeric supplies and is a documented source of lead exposure. This is the single best argument for buying tested product with a certificate of analysis rather than the cheapest powder available.
The science, graded honestly
We grade the evidence for every use so you can see the difference between "proven," "promising," and "traditional."
Turmeric's whole story runs through one awkward fact: the compound everyone is interested in barely gets into the blood.
## Curcumin, not turmeric
When a study says 'turmeric works,' it almost always means curcuminoids - a family of three yellow pigments (curcumin, demethoxycurcumin and bisdemethoxycurcumin), with curcumin the biggest share. Dried turmeric root is only about 2-5% curcuminoids by weight. A standardised extract concentrates that up to 95%. So the word 'turmeric' on a label can mean two wildly different things, and the dose difference between them is roughly twenty- to thirty-fold.
## Why it doesn't absorb well
Swallowed on its own, curcumin has a rough trip. It dissolves poorly in water, a good deal of it is broken down in the gut wall and liver before it ever reaches circulation, and what does get through is rapidly conjugated (tagged with a sugar molecule) and sent out again. Researchers have measured blood levels after large oral doses of plain curcumin and often found them at or below the limit of detection. This is genuinely the central problem in curcumin science, and it's why so much promising lab-dish research has never translated cleanly into people.
## What piperine does
Piperine is the pungent compound in black pepper. It slows down glucuronidation - the tagging-and-excreting step - in the gut and liver, so more curcumin stays intact and in circulation. The best-known measurement of this came from a 1998 study by Shoba and colleagues at St John's Medical College in Bangalore. In the human part of that study, healthy volunteers took 2 g of curcumin either alone or with 20 mg of piperine, and blood was sampled over the following hours. With curcumin alone, serum levels were mostly too low to measure. With piperine added, levels were clearly measurable and the reported increase in bioavailability was about 2,000%.
That number is quoted everywhere, and it deserves two honest caveats. First, the study was small and the curcumin-only comparison was largely below the detection limit - so the headline percentage is a comparison against something close to zero, which inflates the ratio. Second, it has not been cleanly replicated at that magnitude. What is broadly accepted is the direction and the mechanism: piperine meaningfully increases curcumin exposure. The exact multiple is softer than the marketing suggests.
## The part nobody puts on the front of the box
Better absorption cuts both ways. The US Drug-Induced Liver Injury Network noted that several of its more recent turmeric liver-injury cases involved products containing piperine, and raised the possibility that enhanced absorption also enhances the potential for harm. That isn't a reason to avoid piperine - it's a reason to respect the dose, and to treat a concentrated extract as a supplement rather than as seasoning.
Joint comfort & osteoarthritis
Reasonably supportedThis is the one claim where the human evidence is genuinely worth reading, and it's also the claim Health Canada permits for concentrated extracts - so it deserves the most detail.
The largest and most quoted trial is a 2014 Thai multicentre study led by Vilai Kuptniratsaikul at Siriraj Hospital, Mahidol University. The researchers enrolled 367 people with primary knee osteoarthritis and a pain score of 5 or higher, and randomly assigned them to either ibuprofen 1,200 mg a day or Curcuma domestica (turmeric) extract 1,500 mg a day, for four weeks. Both patients and assessors were blinded. The measure was the WOMAC index - a standard osteoarthritis questionnaire scoring pain, stiffness and physical function. Both groups improved, and the turmeric group's improvement was not inferior to ibuprofen's on WOMAC total, pain, stiffness and function. Side effects were broadly similar, with abdominal discomfort the most common in both arms. The honest limitations: four weeks is short for a chronic condition, there was no placebo arm (so we can't separate the drug effect from natural fluctuation and expectation), and the trial was conducted with the involvement of the extract's producer.
The placebo comparison comes from a smaller trial the same year by Panahi and colleagues in Phytotherapy Research. Forty people with mild-to-moderate knee osteoarthritis were randomised to 1,500 mg a day of curcuminoids in three divided doses (19 people) or a matched placebo (21 people) for six weeks, with WOMAC, a visual analogue pain scale and Lequesne's index as outcomes. The curcuminoid group improved significantly more than placebo on all three. It's a properly blinded, placebo-controlled design, which is exactly what you want - but forty people is a pilot, not proof.
Pulling it together, a 2016 systematic review and meta-analysis by Daily, Yang and Park in the Journal of Medicinal Food screened 29 papers and found 8 randomised trials meeting their criteria. Their conclusion was that turmeric extract at roughly 1,000 mg a day of curcumin reduced arthritis symptoms on pain scales and WOMAC to a degree comparable with conventional pain medication - while explicitly stating that the number of trials, the total sample size and the methodological quality were not sufficient to draw definitive conclusions. That's a fair summary of where things stand: consistent direction, thin foundation.
What this means in practice: if you're going to try turmeric for stiff knees, use a standardised extract rather than the spice jar, give it at least four to six weeks, and keep doing the things with much stronger evidence behind them - strength work, movement and weight management.
Kuptniratsaikul 2014, Clinical Interventions in Aging ↗Antioxidant support
Well establishedThis is the least glamorous claim on the page and the most secure. Curcuminoids are polyphenols - the same broad chemical family as the pigments in berries, green tea and olive oil - and they act as antioxidants, meaning they can neutralise reactive molecules called free radicals before those molecules damage cell components.
Health Canada accepts this without argument. Both the turmeric monograph and the concentrated turmeric extracts monograph list 'source of antioxidants / provides antioxidants' as a permitted use, including the longer wording about helping protect cells against the oxidative damage caused by free radicals. For whole turmeric rhizome the ceiling is 9 grams of dried rhizome per day; for concentrated extracts standardised to 75% curcuminoids or more, the ceiling is 1,500 mg of curcuminoids a day and 500 mg per single dose. This is the claim our own capsules carry.
Be clear about what an antioxidant claim is and isn't. It's a statement about chemistry - this ingredient supplies antioxidant compounds - not a promise that taking it will prevent any disease. The leap from 'has antioxidant activity in a test tube' to 'improves health outcomes in people' is exactly the leap that decades of antioxidant research have struggled to make. So take it for what it is: a well-founded, modest, regulator-approved statement about what turmeric contains.
Health Canada: Turmeric - Curcuma longa - Oral monograph ↗Inflammatory markers (CRP, IL-6, TNF-alpha)
Emerging but limitedBeyond how a joint feels, researchers have measured what happens to inflammatory markers in the blood - chiefly C-reactive protein (CRP), a protein the liver makes when the body mounts an inflammatory response, and two signalling molecules, interleukin-6 (IL-6) and tumour necrosis factor alpha (TNF-alpha).
There are now so many trials in this space that people have started reviewing the reviews. A 2024 overview in Nutrients gathered the published meta-analyses of randomised controlled trials of curcumin supplementation and counted how many found an effect. Seven of ten meta-analyses reported a reduction in CRP, and four of five reported a reduction in high-sensitivity CRP. Five of eight found lower IL-6, and six of nine found lower TNF-alpha. So the majority signal points one way.
Now the caveats, which are not small. These trials were run in very mixed populations - metabolic syndrome, type 2 diabetes, kidney disease, obesity, rheumatoid arthritis - using different doses, different formulations (many of them proprietary enhanced-absorption products) and different durations, which is why the pooled results tend to show high statistical heterogeneity and wide confidence intervals. Several of the individual meta-analyses found no significant effect on TNF-alpha at all. Many of the underlying trials are small, and industry funding is common in this literature.
And there's a bigger interpretive gap. Moving a blood marker is not the same as changing how someone feels or what happens to them years later. CRP is a useful signal, but a modest reduction in a number on a lab report has never been shown, for curcumin, to translate into a health outcome anyone would notice. That's why this sits at 'emerging but limited' rather than higher - the biology is coherent and the direction is fairly consistent, but the endpoint is a surrogate, and no Canadian claim rests on it.
Review of meta-analyses, Nutrients 2024 ↗Digestion & traditional herbal use
Traditional useBefore turmeric was a joint supplement, it was a digestive herb - and that's still how the herbal tradition and the regulator classify most of its uses.
Health Canada's turmeric monograph permits several claims grounded in traditional practice rather than modern trials, and it's worth seeing the actual list. Used in Herbal Medicine to aid digestion. Traditionally used in Herbal Medicine to help relieve flatulent dyspepsia - that is, bloating and gassy indigestion, what herbalists call a carminative action. Used in Herbal Medicine as a hepatoprotectant. Used in Herbal Medicine to increase bile excretion by the liver (a choleretic) and to stimulate contraction of the gallbladder (a cholagogue). Traditionally used in Herbal Medicine as an anti-inflammatory to help relieve joint pain. And, from a separate tradition, used in Traditional Chinese Medicine to eliminate blood stasis, promote the flow of qi and relieve menstrual pain due to blood stasis. The dose range for all of these is 1 to 9 grams of dried rhizome per day.
What 'traditional use' means in Canadian regulation is important and often misunderstood. It means the claim is supported by long-documented use within a recognised system of medicine and by established herbal reference texts - Health Canada cites the ESCOP monographs, the Commission E monographs, Mills and Bone, and the Chinese Pharmacopoeia - not by randomised controlled trials. It is a real, legitimate evidence category, and it is also a lower bar than clinical proof. Both things are true at once.
One of these traditional uses carries a practical warning worth repeating: the bile-stimulating action is precisely why people with gallstones or bile-duct obstruction are told to check with a practitioner first. An herb that makes the gallbladder contract is not what you want if there's a stone in the way.
Health Canada: Turmeric - Curcuma longa - Oral monograph ↗Absorption & bioavailability
Reasonably supportedThis isn't a health claim - it's a pharmacology claim, and it underpins everything else on this page. If curcumin doesn't get into you, nothing else matters.
The foundational study is Shoba and colleagues, published in Planta Medica in 1998 out of St John's Medical College in Bangalore. It had a rat arm and a human arm. In the human part, healthy volunteers were given 2 g of curcumin, either alone or together with 20 mg of piperine, and serum curcumin was measured repeatedly over the following hours. Given alone, serum curcumin was either undetectable or extremely low. Given with piperine, concentrations were substantially higher from about 15 minutes to one hour after dosing, and the reported increase in bioavailability - measured as area under the concentration-time curve - was 2,000%. No adverse effects were reported. The proposed mechanism is that piperine inhibits glucuronidation in the gut wall and liver, the process that tags curcumin for rapid excretion.
That 2,000% figure is on a great many labels, including plenty that never mention the study's size or design. Two honest qualifications. First, the curcumin-alone comparison was largely below the assay's limit of detection, so the ratio is being calculated against something close to zero - which makes the percentage look far more dramatic than the underlying absolute change. Second, the finding has not been independently replicated at anything like that magnitude, and some researchers have questioned how much weight it can bear.
What is not seriously disputed is the direction: curcumin absorbs poorly on its own, piperine meaningfully increases how much reaches the bloodstream, and that is why virtually every clinical formulation includes either piperine or some other absorption strategy - phospholipid complexes, micelles, nanoparticles. It's also why the traditional pairing of turmeric with black pepper in cooking looks, in hindsight, rather clever. And it is the reason the liver caution further down this page matters more for modern extracts than it ever did for curry.
Shoba et al. 1998, Planta Medica ↗Who it suits - and who should skip it
It tends to suit
People with everyday joint stiffness and achy knees, who want something to take alongside the basics that actually work - movement, strength, weight management - rather than instead of them. Adults who already cook with turmeric and want a measured, consistent dose. People who read labels and want to see a stated curcuminoid percentage rather than a vague 'turmeric blend.' And people who are patient: the joint trials ran four to six weeks or longer before measuring, and that's a fair expectation to set for yourself.
It probably doesn't suit
Anyone hoping for a fast painkiller. Even in the trials where turmeric extract performed comparably to ibuprofen, the comparison was over weeks, not hours.
Talk to a practitioner first if
You have a liver or biliary disorder, gallstones, or bile-duct disease; you take blood thinners or antiplatelet medication; you're on any prescription medication at all (curcumin can affect the enzymes that clear many drugs); you're pregnant or breastfeeding; you have iron-deficiency anaemia or take iron supplements; or you have surgery coming up. Health Canada's monographs require a 'consult before use' warning for pregnancy and breastfeeding, liver or biliary disorders, and for anyone taking medications, including blood thinners.
Stop and get checked if
You develop yellowing of the eyes or skin, dark urine, nausea, vomiting or stomach pain. That's the exact wording Health Canada now requires on turmeric and curcuminoid labels in Canada, and it isn't boilerplate - it's the presenting picture in the reported liver-injury cases.
Spice vs. root powder vs. standardised extract
These three things share a name and almost nothing else. The clearest way to compare them is by how many curcuminoids you'd actually swallow.
Culinary turmeric (the jar in your cupboard)
Dried, ground rhizome - roughly 2-5% curcuminoids. A generous teaspoon is about 3 g of powder, so perhaps 60-150 mg of curcuminoids, and only a fraction of that gets absorbed. Wonderful food. Not a clinical dose. Health Canada's turmeric monograph works in this territory: up to 9 g of dried rhizome per day for general herbal uses.
Golden milk and turmeric lattes
Same maths as above, usually with less turmeric than you'd think, though the fat in the milk and the pepper in a good recipe do help a little. Treat it as a pleasant daily habit, not a dose.
Non-standardised extracts
A step up in concentration - the monograph allows dry extracts to a maximum 10:1 ratio, still capped at the equivalent of 9 g of dried rhizome a day. Better than powder, but the curcuminoid content varies from batch to batch unless it's stated.
Standardised concentrated extracts (95% curcuminoids)
A different category entirely, and Health Canada treats it that way with a separate monograph for extracts standardised to 75% curcuminoids or more. Here the ceilings are specific: no more than 1,500 mg of curcuminoids per day and 500 mg per single dose; for isolated curcumin, no more than 1,200 mg per day and 400 mg per dose. The joint pain and inflammation claim is tied to 1,500 mg of curcuminoids a day. This is the form the clinical trials used, and the form worth taking seriously in both directions - benefit and caution.
A note on 'enhanced absorption' formulas
Phytosome, liposomal, nanoparticle and micellar curcumins all claim higher absorption. Health Canada explicitly does not cover enhanced-absorption formulations under these monographs; they have to be submitted separately with their own evidence. If a product claims a special delivery system, ask what the actual curcuminoid dose is - the number that matters is still milligrams absorbed, and nobody can compare two different technologies just by reading the front of the box.
For practitioners
A few things worth having front of mind when a client mentions turmeric.
Hepatotoxicity is idiosyncratic, not dose-linear
The US Drug-Induced Liver Injury Network reviewed all adjudicated cases enrolled between 2004 and 2022 and identified ten high-confidence cases attributed to turmeric - 3% of the herbal and supplement cases in that cohort. All were enrolled from 2011 onward and six since 2017. Eight were women, median age 56. Injury was hepatocellular in nine of ten, with a latency of roughly one to four months. Five were hospitalised and one died of acute liver failure. Notably, seven of ten carried HLA-B*35:01, an allele also implicated in green tea and Polygonum multiflorum liver injury, versus a background allele frequency of about 0.06. So this looks like host susceptibility rather than a simple dose effect - which means 'they've been fine on it for years' is reassuring but not a guarantee, and new jaundice in a turmeric user deserves LFTs rather than reassurance.
Piperine changes the risk calculus
Three of the seven products chemically analysed in that series contained piperine, and a fourth listed it. The authors raised the plausible mechanism that increased systemic exposure increases potential toxicity. Worth flagging for clients who stack a high-dose extract with additional black pepper extract.
Drug interactions
Curcumin inhibits several cytochrome P450 enzymes and P-glycoprotein, so the relevant question is not 'is turmeric safe' but 'what else is this person taking.' Health Canada's concentrated-extract monograph specifically names blood thinners in its consult-before-use warning. Memorial Sloan Kettering's About Herbs entry similarly flags increased bleeding risk with anticoagulants and potential interference with chemotherapy. France's ANSES advises against turmeric supplements for people with bile-duct disease and flags interactions with anticoagulants, cancer drugs and immunosuppressants.
Iron
There is at least one well-documented human case of iron-deficiency anaemia attributed to high-dose turmeric extract, which resolved after stopping. In vitro work suggests curcuminoids chelate non-haem iron. Relevant for menstruating clients, vegetarians and anyone already borderline on ferritin.
Evidence quality
Much of the turmeric literature is small, short and frequently funded by extract manufacturers, often testing proprietary branded formulations. The direction of effect for joint symptoms is reasonably consistent, but effect sizes should be read with that in mind.
— Halegoua-DeMarzio et al. 2023, The American Journal of Medicine (DILIN)
What we're actually allowed to say
Myth or fact?
Tap each one to see the verdict.
The numbers just don't line up. Dried turmeric powder is only about 2-5% curcuminoids, so a heaped teaspoon - roughly 3 g - supplies somewhere around 60-150 mg of curcuminoids, and only a small fraction of that is absorbed. The joint trials used 1,500 mg of curcuminoids a day, and Health Canada ties its joint claim for concentrated extracts to that same figure. You would need to eat an implausible amount of curry to get there. Cooking with turmeric is a genuinely good habit, and it's how billions of people have used it safely for millennia. It just isn't a clinical dose, and nobody should pretend otherwise in either direction. Health Canada: Concentrated turmeric extracts and isolates monograph ↗
This is the one we'd most like people to take seriously. The US Drug-Induced Liver Injury Network reviewed every adjudicated case enrolled between 2004 and 2022 and found ten high-confidence cases of liver injury attributed to turmeric supplements - all since 2011, six since 2017. Eight were women, the median age was 56, and the injury was hepatocellular in nine of the ten, appearing one to four months after starting. Five people were hospitalised and one died of acute liver failure. Seven of the ten carried a particular immune-system gene variant, HLA-B*35:01, at a rate far above the general population, which suggests some people are simply more susceptible. Health Canada reviewed the evidence, concluded the risk is idiosyncratic and rare but can be serious, and in 2025 required warning wording on all turmeric and curcuminoid product labels in Canada. Australia's TGA, Italy and France have issued their own warnings. To keep this in proportion: millions of people take turmeric without incident, and this is rare. But 'it's just a spice' is not a safety argument, and a concentrated extract is not the same as a spice. Halegoua-DeMarzio et al. 2023, The American Journal of Medicine (DILIN) ↗
Curcumin does interesting things to cancer cells in a dish, which is why there are thousands of laboratory papers and a great deal of breathless coverage. It has not been shown to treat, cure or prevent cancer in people, and no regulator anywhere permits that claim. The core reason is the absorption problem: it has never been clear that oral curcumin reaches concentrations in the body anywhere near those used in the lab. The authors of the DILIN liver-injury paper put it plainly - despite broad claims of benefit, the clinical trials published so far have not produced evidence of significant efficacy, and turmeric is not an approved therapeutic agent. If you have cancer, talk to your oncology team before taking any supplement; curcumin can interfere with the enzymes that process chemotherapy drugs. Halegoua-DeMarzio et al. 2023, The American Journal of Medicine ↗
The mechanism is real. Piperine inhibits glucuronidation, the process that tags curcumin for rapid excretion, so more of it stays in circulation - and in the 1998 human study by Shoba and colleagues, serum curcumin was largely undetectable when taken alone but clearly measurable when 20 mg of piperine was added. What's overstated is the famous '2,000% more absorbable' figure printed on so many labels: that ratio was calculated against a control that sat at the limit of detection, in a small study that hasn't been replicated at that magnitude. So piperine is not a gimmick - it's a sensible, well-reasoned addition - but the number is doing more marketing work than scientific work. And it cuts both ways: the DILIN researchers noted piperine in several of the more recent liver-injury cases and suggested the enhanced absorption may enhance the risk too. Shoba et al. 1998, Planta Medica ↗
Health Canada set explicit ceilings for a reason: no more than 1,500 mg of curcuminoids a day and 500 mg in a single dose, or for isolated curcumin, no more than 1,200 mg a day and 400 mg per dose. Going above that doesn't buy you anything the trials have demonstrated - the joint studies landed at 1,000-1,500 mg a day, not higher - and it moves you outside the range regulators have assessed. There's also a specific cautionary case: a 66-year-old physician who took six turmeric extract capsules a day for an osteoarthritis flare developed iron-deficiency anaemia that resolved within weeks of stopping, published by Smith and Ashar in Cureus in 2019. High doses are also the most common trigger for the mild but real side effects - nausea, indigestion, loose stools. Stay on the label. Health Canada: Concentrated turmeric extracts and isolates monograph ↗
How to use it
Common forms
How much
It depends entirely on the form, and the difference is large. Whole dried turmeric rhizome and non-standardised extracts: Health Canada allows 1-9 grams of dried rhizome equivalent per day. Concentrated extracts standardised to 75% curcuminoids or more: no more than 1,500 mg of curcuminoids per day and 500 mg in a single dose. Isolated curcumin: no more than 1,200 mg per day and 400 mg per dose. The joint pain and inflammation claim is tied specifically to 1,500 mg of curcuminoids daily. The clinical trials that found a benefit for knee osteoarthritis used roughly 1,000-1,500 mg of curcuminoids a day in divided doses, over four to six weeks or longer. Take it with a meal containing some fat - curcumin is fat-soluble, and food reduces stomach upset. Time of day doesn't matter; there's no stimulant effect. Splitting the daily amount in two matches the trials and keeps you under the per-dose ceiling. Give it at least four to six weeks before judging. These monographs apply to adults 18 and over.
Capsules with food (paired with black pepper).
Five things separate a real turmeric extract from a weak one:
A stated curcuminoid percentage. '95% curcuminoids' or '95% curcumin' is a specification. 'Turmeric blend' or 'turmeric root powder' is not - and the difference between them can be twenty-fold.
Milligrams of curcuminoids, not just milligrams of extract. Do the multiplication: 600 mg of a 95% extract is about 570 mg of curcuminoids. That's the number to compare across brands, and to check against Health Canada's 1,500 mg/day ceiling.
An absorption strategy. Piperine (black pepper extract) is the classic and best-documented one. Without something, most of the curcumin simply doesn't get in.
An NPN number. In Canada, a Natural Product Number means Health Canada has assessed the product's ingredients, dose and claims. No NPN, no assessment.
Third-party testing with a certificate of analysis you can actually see. Turmeric has a real history of adulteration with synthetic dyes and lead-based pigments used to brighten the colour. Ask for the COA.
Frequently asked questions
Straight answers to the things people actually ask.
Turmeric (Curcuma longa) is the plant - specifically its bright orange rhizome, the knobbly underground stem that gets dried and ground into the spice. Curcumin is one compound inside it. Turmeric contains a family of three yellow pigments called curcuminoids, and curcumin is the largest share of them. Dried turmeric root is only about 2-5% curcuminoids by weight, while a standardised supplement extract concentrates them to 75-95%. Almost all the modern research is on curcuminoids, not on the whole root, which is why the two words are not interchangeable on a label. Health Canada keeps them separate too: it has one monograph for turmeric rhizome and a different one for concentrated extracts and isolates, with different permitted doses.
Because curcumin is notoriously hard to absorb. Taken on its own it dissolves poorly, gets broken down in the gut wall and liver, and is cleared quickly - in studies, blood levels after a large oral dose are often too low to even measure. Piperine, the pungent compound in black pepper, slows down one of the main clearance steps (glucuronidation), so more curcumin stays in circulation. In the human portion of a 1998 study by Shoba and colleagues in Planta Medica, volunteers took 2 g of curcumin with or without 20 mg of piperine; with piperine, serum levels were clearly measurable where before they mostly weren't, and the reported bioavailability increase was 2,000%. Worth knowing: that figure is calculated against a near-zero baseline and has not been replicated at that magnitude, so treat the direction as solid and the exact number as marketing. Our capsules include piperine for this reason.
Follow the label - and know that the label depends entirely on which form you have. For whole dried turmeric rhizome and non-standardised extracts, Health Canada's monograph allows 1 to 9 grams of dried rhizome equivalent per day. For concentrated extracts standardised to 75% curcuminoids or more, the ceilings are much lower because the material is much stronger: no more than 1,500 mg of curcuminoids per day and 500 mg in a single dose. For isolated curcumin, no more than 1,200 mg per day and 400 mg per dose. The joint pain and inflammation claim is tied specifically to 1,500 mg of curcuminoids a day. The clinical trials that found a benefit for knee osteoarthritis used roughly 1,000-1,500 mg a day, in divided doses, for four to six weeks or longer. There is no evidence that exceeding these amounts helps, and good reason not to.
You can, and it's a lovely thing to do - but be honest with yourself about what you're getting. A heaped teaspoon of turmeric powder is about 3 grams, which at 2-5% curcuminoids works out to roughly 60-150 mg of curcuminoids, before you account for how little of that is absorbed. The trials that showed a benefit for stiff knees used 1,500 mg of curcuminoids a day. So culinary turmeric and a standardised extract are separated by a factor of ten or twenty. Cook with it for the flavour, the colour and the general goodness of eating like that; if you want the dose the research used, that's what a standardised extract is for. Adding black pepper and a little fat to your cooking does genuinely help absorption, which is why the traditional pairing makes sense - it just can't close a twenty-fold gap.
For most people, no - but this is a real risk that we won't talk around. The US Drug-Induced Liver Injury Network reviewed all its adjudicated cases from 2004 to 2022 and found ten high-confidence cases of liver injury attributed to turmeric supplements, all from 2011 onward and six since 2017. Most were women, median age 56; the injury typically appeared one to four months after starting; five people were hospitalised and one died of acute liver failure. Most cases resolved quickly once the supplement was stopped. Seven of the ten carried the gene variant HLA-B*35:01 at a rate far above the general population, which suggests susceptibility is partly genetic rather than simply dose-related. Health Canada reviewed this and, in 2025, required warning wording on all turmeric and curcuminoid product labels: consult a practitioner before use if you have a liver or biliary disorder or take medications, and stop use and consult a practitioner if you develop yellowing of the eyes or skin, dark urine, nausea, vomiting or stomach pain. Australia, Italy and France have issued similar advice. Millions take turmeric uneventfully - but if those symptoms appear, stop and get checked.
Not without asking your doctor first. Health Canada's monograph for concentrated turmeric extracts specifically names blood thinners in its consult-before-use warning, and Memorial Sloan Kettering's About Herbs database flags that turmeric can interfere with anticoagulants and increase bleeding risk. France's food safety agency, ANSES, similarly warns about interactions with anticoagulants, cancer drugs and immunosuppressants. The broader issue is that curcumin affects several cytochrome P450 enzymes - the liver machinery that clears a great many prescription drugs - so the honest answer for anyone on regular medication is 'check first,' not 'it's natural, it's fine.' Around surgery, the usual advice is to stop supplements that may affect bleeding well in advance; ask your surgical team how long they want, since practices differ.
Take it with a meal, ideally one containing some fat. Curcumin is fat-soluble, so food helps it along, and it also reduces the mild stomach upset some people get on an empty stomach. Time of day doesn't matter much - there's no stimulant effect, so morning or evening both work. Splitting the daily amount across two doses matches how the trials were run and keeps you under the per-dose ceiling. On timing of effects: give it four to six weeks at minimum. The knee osteoarthritis trials measured their outcomes at four weeks (Kuptniratsaikul 2014) and six weeks (Panahi 2014), and improvement was gradual rather than sudden. If nothing has shifted after a couple of months of consistent use, it's reasonable to conclude it isn't doing much for you.
Health Canada requires a consult-a-practitioner-first warning for pregnancy and breastfeeding, for anyone with a liver or biliary disorder, and for anyone taking medications, including blood thinners. Beyond that, a few sensible additions. Gallstones or bile-duct obstruction: turmeric traditionally stimulates the gallbladder to contract, which is not what you want if there's a stone in the way, and ANSES advises against turmeric supplements for people with bile-duct disease. Iron-deficiency anaemia or low ferritin: curcuminoids appear to bind non-haem iron in the gut, and there is a published human case (Smith and Ashar, Cureus 2019) of a man who developed iron-deficiency anaemia on six turmeric capsules a day, which resolved after stopping. Anyone on chemotherapy or immunosuppressants should clear it with their team. And anyone prone to reflux or a sensitive stomach may find higher doses uncomfortable. As with any supplement: children and teenagers aren't covered by these monographs, which apply to adults 18 and over.
More than for most botanicals, and it's worth knowing the exact list. Under the turmeric rhizome monograph, permitted uses include: source of antioxidants; used in Herbal Medicine to aid digestion; traditionally used in Herbal Medicine to help relieve flatulent dyspepsia; used in Herbal Medicine as a hepatoprotectant; used in Herbal Medicine to increase bile excretion and stimulate gallbladder contraction; traditionally used in Herbal Medicine as an anti-inflammatory to help relieve joint pain; and a set of Traditional Chinese Medicine uses. Under the separate monograph for concentrated extracts standardised to 75% curcuminoids or more, the permitted uses are narrower but stronger: source of antioxidants, and 'helps relieve joint pain and inflammation' at 1,500 mg of curcuminoids per day. What is not permitted is anything about cancer, heart disease, depression, Alzheimer's, diabetes or immunity - and no product may claim to treat, cure or prevent any disease. Our own capsules carry the antioxidant claim, because our daily amount sits below the 1,500 mg threshold the joint claim requires.
What's in our capsules, and why
Our turmeric is a standardised extract, not ground root. Each capsule provides 600 mg of certified organic turmeric extract standardised to 95% curcumin, plus piperine from black pepper for absorption. The adult direction is two capsules daily with food - 1,200 mg of extract a day. It's licensed in Canada under NPN 80140969, in vegan capsules, third-party tested for purity and potency, with the certificate of analysis on the product page.
Two honest points about the label.
First, the reason it says 'source of antioxidants for the maintenance of good health' rather than anything about joints: Health Canada ties the joint pain and inflammation claim for concentrated extracts to 1,500 mg of curcuminoids per day. Our daily amount sits below that, so we don't make that claim. We would rather say less on a label than stretch it.
Second, we include piperine because curcumin genuinely struggles to be absorbed without help - the same pairing traditional cooking arrived at long before anyone measured it. But as covered above, better absorption is not a free lunch, and the liver caution on this page applies to our product exactly as much as to anyone else's.
Take it with a meal that contains some fat. Curcumin is fat-soluble, and food also softens the mild stomach upset some people get on an empty stomach.
See the product & full COA →Side effects & safety
- Liver injury (rare but documented): The US Drug-Induced Liver Injury Network reported ten high-confidence cases of liver injury attributed to turmeric supplements between 2004 and 2022, six of them since 2017. Most were women, median age 56; injury typically appeared one to four months in. Five were hospitalised and one died of acute liver failure; most cases resolved on stopping. Seven of ten carried the HLA-B*35:01 gene variant, suggesting susceptibility is partly genetic rather than simply dose-driven. Health Canada now requires a liver warning on all turmeric and curcuminoid labels in Canada.
- Stop use and see a practitioner if: You develop yellowing of the eyes or skin, dark urine, nausea, vomiting or stomach pain. This is Health Canada's required wording, and it is exactly how the reported cases presented.
- Liver or biliary disorder: Ask a practitioner before use. Health Canada requires this warning on every turmeric and curcuminoid product.
- Blood thinners and other medications: Ask a practitioner before use if you take any medication, including blood thinners - Health Canada names them explicitly. Curcumin affects several cytochrome P450 enzymes that clear many prescription drugs. MSK's About Herbs database flags increased bleeding risk with anticoagulants; ANSES flags anticoagulants, cancer drugs and immunosuppressants. Ask your surgical team about stopping before an operation.
- Gallstones and bile-duct disease: Turmeric traditionally stimulates the gallbladder to contract and increases bile flow - which is not what you want if there's a stone or an obstruction. France's ANSES advises against turmeric supplements for people with bile-duct disease.
- Iron absorption: Curcuminoids appear to bind non-haem iron in the gut. A published case (Smith and Ashar, Cureus 2019) describes a 66-year-old man who developed iron-deficiency anaemia while taking six turmeric extract capsules a day; it resolved within weeks of stopping. Relevant if you have low ferritin, menstruate heavily, or take iron.
- Pregnancy and breastfeeding: Ask a practitioner before use - required by Health Canada on all turmeric products.
- Digestive upset: The most common everyday side effect at higher doses: nausea, indigestion, reflux or loose stools. Taking it with food usually helps.
- Chemotherapy and immunosuppressants: Clear it with your treating team first. Curcumin can interfere with the enzymes that process these drugs.
The bottom line
Turmeric is one of the few botanicals where the traditional use, the modern research and the regulator broadly point the same direction - as long as you're honest about how far that direction goes.
What's solid: it's a well-established source of antioxidants, it has thousands of years of culinary and Ayurvedic use behind it, and a reasonable body of randomised trials suggests standardised extracts around 1,000-1,500 mg of curcuminoids a day can help with knee osteoarthritis symptoms. Health Canada permits both an antioxidant claim and, at the right dose, a joint pain and inflammation claim.
What's oversold: nearly everything else. The internet's turmeric - the cancer preventer, the depression cure, the miracle anti-inflammatory - rests mostly on cell-culture and animal work that has never survived the journey into a well-run human trial, largely because curcumin is so poorly absorbed. And the human trials that do exist are usually small, short, and often paid for by the company selling the extract.
What deserves real respect: the liver signal. It's rare, it's idiosyncratic, and it appears to be tied partly to genetics rather than dose - but people have been hospitalised and one person in the DILIN series died. Health Canada, Australia's TGA, Italy and France have all acted on it. If you get yellow eyes, dark urine, persistent nausea or stomach pain, stop and see someone.
Our honest position: worth trying for everyday joint comfort if you'll give it six weeks, take it with food, keep it within the labelled dose, and mention it to your doctor if you're on anything else. Not a miracle. Not a medicine. A good spice with one genuinely useful extract behind it.
References
Every graded claim links to its source; here they are together.
- Joint comfort & osteoarthritis: Kuptniratsaikul 2014, Clinical Interventions in Aging
- Antioxidant support: Health Canada: Turmeric - Curcuma longa - Oral monograph
- Inflammatory markers (CRP, IL-6, TNF-alpha): Review of meta-analyses, Nutrients 2024
- Digestion & traditional herbal use: Health Canada: Turmeric - Curcuma longa - Oral monograph
- Absorption & bioavailability: Shoba et al. 1998, Planta Medica
- Health Canada: Concentrated turmeric extracts and isolates monograph
- Halegoua-DeMarzio et al. 2023, The American Journal of Medicine (DILIN)
- Halegoua-DeMarzio et al. 2023, The American Journal of Medicine
- Shoba et al. 1998, Planta Medica
- Health Canada: Concentrated turmeric extracts and isolates monograph