Curcumin

Turmeric or Curcumin: What's Really in a Capsule?

Turmeric (Curcuma longa) is a herbaceous plant in the ginger family, the rhizome of which is used. Dried and ground, it produces the orange-yellow spice used in Indian cuisine. Curcumin is just one component: it belongs to the curcuminoids, a trio formed by curcumin itself, demethoxycurcumin, and bisdemethoxycurcumin, which give the rhizome its color.

The difference between the two is considerable. Spice powder contains only a few percent of curcuminoids—around 2 to 5% depending on the origin. A teaspoon, about 3 grams, therefore provides only a few tens of milligrams at best, whereas a 95% standardized extract concentrates the same amount in a fraction of a capsule. Seasoning your dishes and taking an extract are not two intensities of the same action: they are two uses, one culinary, the other as a dietary supplement—and it is this second use that this section covers.

One last confusion to clear up: the gardener's Curcuma, grown for its flowers, belongs to the same botanical genus but has nothing to do with the spice or supplements. Here, we are only talking about the rhizome of Curcuma longa.

Why is curcumin so poorly absorbed?

This is the central problem of this category, and everything else follows from it. Curcumin is very poorly soluble in water, and the small amount that crosses the intestinal barrier is immediately taken up by the conjugating enzymes of the intestine and liver—glucuronidation, sulfation—and then eliminated. Swallowed as powder, it only yields very low blood concentrations, sometimes at the limit of detection. Hence the processes developed by manufacturers: they are not all equal and do not act in the same way.

• Piperine, an alkaloid from black pepper (often under the BioPerine® brand), does not improve dissolution: it slows down degradation. By inhibiting certain conjugating and metabolizing enzymes, it allows curcumin to circulate longer. It is the oldest and least expensive method, but its direct drawback is that the same enzymes metabolize medications, which makes piperine a factor in drug interactions.
• Phytosomal forms combine curcuminoids with phospholipids, usually sunflower or soy phosphatidylcholine. This phospholipid complex crosses the intestinal membrane, which is rich in lipids, more easily.
• Micellar forms encapsulate curcumin in micelles formed by emulsifiers: the product disperses in water instead of settling, and absorption increases significantly. These are the forms with the highest multipliers, and those that warrant the most caution regarding dosage.
• Cyclodextrins are cyclic sugars whose interior cavity is hydrophobic: curcumin lodges there and forms a water-soluble inclusion complex.
• Turmeric essential oil, rich in ar-turmerone, is reintroduced into certain patented extracts like BCM-95®, with the idea of restoring some of the rhizome's compounds and improving passage.

The general principle is worth remembering: these processes increase the amount of curcumin that reaches the blood, and this is not neutral. A highly bioavailable form is not an "improved" version without trade-offs—it means higher exposure at the same stated dose, and this is precisely what health authorities monitor.

How to read a dosage on the label?

Two figures circulate and are regularly confused: the amount of extract and the amount of curcuminoids actually provided. In a 95% standardized extract, 500 mg of extract provides approximately 475 mg of curcuminoids—the two values are close. In a phytosomal or micellar form, the total mass includes the phospholipid or emulsifier, and 500 mg of complex may contain only 100 mg of curcuminoids, or even less. Comparing these two products based on the large number displayed makes no sense.

Next comes the advertised bioavailability. The multipliers displayed on packaging come from studies comparing the product to raw curcumin, with protocols and measurement parameters that differ from one manufacturer to another: they are not comparable between brands. What you need to remember can be summed up in one sentence—the more bioavailable the form, the lower the curcuminoid dose should be.

Three mentions are worth looking for: the name of the extract or process, the titration percentage, and the quantity of curcuminoids per daily dose. A product that only displays "turmeric 1,000 mg" leaves you ignorant of what you are taking.

What dose, when, and with what?

There is an official numerical benchmark here, which is not so common. The acceptable daily intake of curcumin is 3 mg per kilogram of body weight, or 180 mg per day for an adult weighing 60 kg. Since diet already provides some, ANSES recommends that the dose from supplements remain below 153 mg per day for the same weight. This threshold applies to curcuminoids, not to the mass of extract, and is valid regardless of the form.

The consequence is counter-intuitive: a 95% standardized capsule providing 475 mg of curcuminoids significantly exceeds this benchmark, while a highly bioavailable form dosed at 100 mg stays within it. The largest number on the box is not necessarily the best product.

Since curcuminoids are fat-soluble, taking them with a meal containing fats remains the rule for classic extracts, including piperine: a drizzle of olive oil, a few oilseeds, or a cooked dish are sufficient, and our omega-3s work just as well. The requirement is less stringent for micellar and cyclodextrin forms, which are designed to be taken without a fatty support—in that case, follow the manufacturer's instructions.

What are the contraindications and risks?

Turmeric long had a reputation for complete harmlessness; vigilance data have nuanced this picture. Since the implementation of nutrivigilance in 2009, ANSES has received more than a hundred reports of adverse effects related to supplements containing turmeric or curcumin, including fifteen cases of liver damage; about twenty cases of hepatitis have also been reported in Italy. The Agency links this signal to the proliferation of forms with increased bioavailability, which expose the body to quantities incomparable to culinary use.

• Biliary tract diseases — gallstones, obstruction, history: consumption is not recommended by ANSES. Turmeric stimulates gallbladder contraction.
• Anticoagulant, anticancer, and immunosuppressive treatments: do not take anything without medical advice. ANSES specifically targets these three families.
• Known liver damage, history of hepatitis, or liver-risky treatment: medical advice, and avoidance of highly bioavailable forms.
• Before surgery: inform the anesthetist about your intake and stop the product as instructed.
• Pregnancy and breastfeeding: outside of culinary use, supplementation is not recommended without medical advice.
• Iron: curcuminoids bind to dietary iron, to be taken into account in cases of monitored iron deficiency.

More broadly, ANSES reminds us that ongoing medication treatment justifies seeking advice from a doctor or pharmacist before taking a supplement—this remark is doubly true for a formula containing piperine. The most commonly reported benign effects are digestive: nausea, reflux, diarrhea. Unusual fatigue, dark urine, or yellowing of the skin require immediate cessation and consultation.

What can be said about its effects?

Nothing, in the regulatory sense. No health claim is authorized in Europe for turmeric or curcumin. A page that promises an effect on joints, digestion, inflammation, or the liver goes beyond the legal framework—including for formulas that combine it with glucosamine or collagen.

What can be said: curcumin is one of the most studied plant molecules, with an abundant, very heterogeneous literature, and a fundamental problem often noted—the difficulty of obtaining relevant blood concentrations, the very problem that patented forms seek to solve. We sell an extract whose nature, titration, and curcuminoid content we display; the rest belongs to research, and your situation to your doctor.

Frequently Asked Questions

What is curcumin?

It is the yellow pigment of the Curcuma longa rhizome, and one of the three curcuminoids it contains, along with demethoxycurcumin and bisdemethoxycurcumin. Do not confuse turmeric and curcumin: the spice contains only 2 to 5% of it, whereas a standardized extract can be up to 95%. Its most important characteristic for the buyer is that it is very poorly soluble in water and very quickly eliminated by the liver: this is why forms with piperine, phytosomal, micellar, or cyclodextrin exist.

What are the benefits of turmeric?

No benefit can be announced to you, and this is not a stylistic precaution: no health claim is authorized in Europe for turmeric or curcumin. Not for joints, not for digestion, not for inflammation, not for the liver. Any page that states otherwise goes beyond the legal framework, even when the formula adds collagen or glucosamine. What can be honestly said: curcumin is one of the most studied plant molecules in the world, the literature is abundant and very heterogeneous, and it faces a recurring obstacle—the difficulty of achieving significant blood concentrations. None of this work has led to regulatory recognition.

How to consume turmeric for it to be effective?

Two practical lessons emerge from what is known about its absorption. First, the spice alone is not enough to reach the quantities of curcuminoids used in published studies: its content is too low and its passage too poor. Second, a classic extract should be taken with a meal containing fats, as curcuminoids are fat-soluble—a drizzle of olive oil, a few oilseeds, or a cooked dish are sufficient. Micellar and cyclodextrin forms are designed to be taken without a fatty support: follow the manufacturer's instructions. In cooking, combining turmeric with black pepper and a fatty substance remains the traditional practice, and it has a real logic—without turning a dish into a dietary supplement, however.

What is the daily dose of turmeric, and can it be taken continuously?

The benchmark figure is the acceptable daily intake of curcumin: 3 mg per kilogram of body weight, or 180 mg per day for an adult weighing 60 kg. Since diet already provides some, ANSES recommends that the dose from supplements remain below 153 mg per day for the same weight. This threshold applies to curcuminoids, never to the displayed extract mass. No maximum duration is set; given the liver signal, a time-limited intake with interruptions remains more prudent than continuous consumption, especially with a highly bioavailable form.

When to take turmeric, morning or evening?

The time of day has no established importance; what matters is the meal. Since curcuminoids are fat-soluble, a classic extract, including piperine, is absorbed much better with a meal containing fats: a drizzle of olive oil, a few oilseeds, or a cooked dish are sufficient. Micellar and cyclodextrin forms are designed to be taken without a fatty support and follow the manufacturer's instructions. If you divide a high dose, spread it over two meals rather than taking everything on an empty stomach.

What is the danger of turmeric?

The paradox of this product is summarized in one sentence: the spice in cooking does not pose any particular problem, concentrated supplements do. A 95% standardized extract, especially in a form with increased bioavailability, exposes the body to quantities incomparable to a spoonful of powder in a curry—and this is precisely what ANSES points out. Three situations should explicitly be avoided without medical advice: biliary tract diseases (turmeric stimulates gallbladder contraction), anticoagulant, anticancer, or immunosuppressive treatments, and any known liver damage. Add to this pregnancy and breastfeeding outside of culinary use, and scheduled surgery. Finally, the piperine present in many formulas acts on enzymes that metabolize medications: if you are on medication, the question arises before purchase.

What are the side effects of turmeric?

The most frequent are digestive and benign: nausea, reflux, diarrhea. The serious signal is hepatic. Since 2009, ANSES has received more than a hundred reports related to supplements containing turmeric or curcumin, including fifteen cases of liver damage; about twenty cases of hepatitis have also been reported in Italy, and the Agency links this signal to forms with increased bioavailability. Yellow stool coloration is common and harmless; however, unusual fatigue, dark urine, or yellowing of the skin require immediate cessation and consultation.

Does turmeric thin the blood?

No claim to this effect is authorized, and human data do not allow it to be affirmed. However, caution remains necessary, and for a specific reason: ANSES explicitly targets anticoagulant treatments among those that require medical advice before taking any turmeric-based supplement. If you are on anticoagulants or antiplatelet agents, the answer does not come from a web page but from your doctor or pharmacist. The same applies before surgery: inform the anesthetist, who will tell you when to stop it.

Is turmeric good for the intestines?

No digestive claim is authorized in Europe for turmeric, and we will therefore not make any. What is documented rather goes in the opposite direction at high doses: the most frequently reported adverse effects with supplements are precisely digestive—nausea, reflux, diarrhea. Persistent intestinal discomfort warrants medical advice rather than a randomly purchased supplement; if your question concerns digestive comfort, look instead at our probiotics and digestive enzymes sections, some strains and enzymes of which fall under a different framework.

Is turmeric an anti-inflammatory?

We are not allowed to write it, and no one else is: no health claim is authorized in Europe for turmeric or curcumin, including on inflammation, joints, or osteoarthritis. This is why serious labels only display a composition. What can be honestly said: curcumin is one of the most studied plant molecules, the literature is abundant and very heterogeneous, and none of this work has led to regulatory recognition. Painful joints should be addressed by a doctor, not with a supplement purchased on your own.

Is powdered turmeric sufficient?

For cooking, yes. To achieve the quantities of curcuminoids used in published studies, no: the spice's content is too low and its absorption too poor.

Is piperine absolutely necessary, and which form to choose?

No, piperine is not mandatory. It is the oldest and cheapest method, but also the one that raises the most questions about drug interactions, as it acts on enzymes that also metabolize medications. Phytosomal, micellar, or cyclodextrin forms do not require it. None is absolutely superior: a 95% standardized extract is the simple and clear choice, while a highly bioavailable patented form is justified for a reduced intake of curcuminoids. Always compare based on the curcuminoid content per dose, never on the total mass.

Can it be combined with other supplements?

Nothing prevents it with common micronutrients in our multivitamins, vitamin D, or CoQ-10 sections. Always add up the intakes when several formulas overlap, and avoid combining several products acting on the liver, such as berberine or NAC.

Is it useful for bodybuilding?

It is not part of the basic foundation for an athlete, which relies on training, nutrition, and basic sports nutrition products. It is rather categorized under daily comfort, like ashwagandha or spirulina; our sports nutrition guide explains each category.

Is curcumin available in pharmacies?

Yes, as in specialist stores, organic shops, and online: it is a dietary supplement, and its distribution is unrestricted. The counter does not guarantee the dosage, and the process remains the same everywhere: identify the name of the extract or method, the percentage of standardization, and the quantity of curcuminoids per daily dose. Pharmacies, however, offer a real advantage for this specific product: if you are taking an anticoagulant, anticancer drug, or immunosuppressant, the pharmacist can check for interactions before purchase—which ANSES explicitly recommends.

Where to buy turmeric or curcumin?

On this page, with shipping throughout France and Europe, or in our store in Vendargues, about ten minutes from Montpellier: collection within 2 hours and orders placed before 2 pm shipped the same day. In this category, visiting the store has a concrete benefit: comparing two boxes side-by-side to find the actual curcuminoid content per dose on each. The comparison often reveals surprises and is difficult to do from a product page.

What brands can be found in this department?

Our criterion is the label: nature of the extract, standardization, curcuminoid content per dose. Sinob offers a 95% standardized extract combined with piperine, the classic and most straightforward formula. IO.Genix combines a turmeric extract with patented piperine. TrainedByJP uses BCM-95®, which combines curcuminoids and turmeric essential oil. Our Nutriting, Now Foods, probiotics, and digestive enzymes sections complete the range. What we do not reference: rhizome powders sold at the price of an extract, formulas without stated curcuminoid content, and boxes with prohibited claims.

Advice in-store near Montpellier?

Our store in Vendargues, about ten minutes from Montpellier, allows for the most useful exercise in this category: placing two boxes side-by-side and finding the actual curcuminoid content per daily dose on each. The comparison often reveals surprises. We also ship everywhere in France and Europe. We will tell you what a formula contains and how to take it; in case of anticoagulant treatment or a history of biliary or hepatic issues, the answer belongs to your doctor.

Sources: ANSES, work on food supplements containing turmeric or curcumin and the nutrivigilance system; EFSA for the acceptable daily intake of curcumin and the health claims regime.