Launch — Access limited to 250 Members to ensure personalized follow-up quality.
Mechanism of ActionKey BenefitsDosage & FormsIn the Singular FormulaSafety & PrecautionsScientific StudiesFrequently Asked Questions
Curcumin

Curcumin

Curcuminoïdes · Diferuloylméthane · Turmeric extract · Curcuma longa

PhytonutrientsSystemic inflammation

Curcumin is the flagship active molecule of turmeric. Its poor natural absorption long capped what could be expected of it, and galenics moved that line: the phospholipid complex used here is absorbed nearly eight times better, quantity for quantity, than an ordinary extract. What trials measure most often comes down to three areas. The knee first, with sixteen controlled trials bringing together 1,810 adults. Then C-reactive protein and the blood's antioxidant defences, each followed across sixty-six trials. Liver markers and mood come next, on narrower work. With age, these areas weaken early: joints under strain, oxidative balance drifting, a more sensitive liver. Supporting these natural defences aims to preserve functional capital for longer, which explains the attention longevity research gives it.

Last updated: August 11, 2026

Mechanism of Action

Laboratory work describes curcumin as a molecule acting on several fronts at once. It directly neutralises reactive oxygen species, the unstable molecules that damage cells day to day, and it promotes production of the antioxidant enzymes the body makes itself. This dual register, direct and indirect, is what human trials then pick up as antioxidant capacity measured in blood.

The same experimental body describes involvement in regulating the body's response to stressors, and support for the processes by which cells recycle their damaged components. These descriptions come from the laboratory and from animals: they illuminate what is observed in humans, they do not demonstrate it.

One point sets the phospholipid complex apart from other forms: what then circulates in the blood is not curcumin itself, but mainly its demethoxylated derivatives and its conjugated metabolites. It is this signature, not the starting molecule, that kinetic studies measure.

Key Benefits

  • Moderate

    Less bother from the knee day to day: sixteen controlled trials bringing together 1,810 adults whose cartilage has worn down measure a drop in pain and a gain in function, over intakes of up to sixteen weeks.

  • Moderate

    A calmer overall response from the body: this is what the drop in C-reactive protein, or CRP, reflects. Sixty-six controlled trials measure it in adults, and the gap holds in trials using an absorption-enhanced form.

  • Moderate

    Cells better shielded against oxidative wear: the same sixty-six trials measure a rise in the blood’s antioxidant defences and a drop in a marker of fat degradation. In thirty-eight healthy adults aged 40 to 60, four weeks at 80 mg per day are enough to raise two of those defences.

  • Emerging

    Improving liver markers: in adults with fat accumulation in the liver, fifteen controlled trials covering 905 people measure a drop in two liver enzymes.

  • Emerging

    A preliminary signal on mood: in healthy adults aged 50 to 85, two randomized placebo-controlled trials measure a drop in perceived fatigue, after four and then twelve weeks at 80 mg per day.

Dosage & Forms

Curcumin exists in many galenic forms, whose absorption varies fortyfold. Raw turmeric powder offers very little of it: most is transformed by the body before reaching the general circulation.

Three families stand out. Phospholipid complexes bind curcuminoids to dietary phospholipids, whose affinity for fats eases passage across the intestinal barrier. Colloidal dispersions and micellar forms exploit dissolution in an aqueous medium. Combinations with piperine, extracted from black pepper, slow the liver's transformation of curcumin but may alter the metabolism of other substances.

A double-blind crossover trial compared these families in the same volunteers, at curcuminoid amounts adjusted to dose. The phospholipid complex reaches 7.9 times the unformulated mixture; the piperine combination is indistinguishable from it.

Intakes used in trials range from 200 to 1,000 mg of curcuminoids per day, over eight to sixteen weeks. Those figures apply to non-optimised forms: a better-absorbed form delivers the same exposure from a smaller quantity, and that is the whole point of galenics. In France, a daily intake must stay below 153 mg of curcuminoids.

In the Singular Formula

Inclusion rationale

The principal polyphenol of the turmeric rhizome (Curcuma longa), the golden spice at the heart of the Ayurvedic tradition for over 4,000 years. Curcumin is one of the most studied plant compounds in the world, with more than 28,000 publications indexed on PubMed. Its naturally limited oral bioavailability has been the primary galenic challenge: in its native form, curcumin is rapidly metabolized by the liver. A double-blind human crossover trial, run in the same volunteers and adjusted for dose, places absorption of the curcuminoid-phospholipid complex at 7.9 times that of the unformulated curcuminoid mixture. Sixteen controlled trials bringing together 1,810 adults measure a drop in knee pain and a gain in function; sixty-six trials measure a drop in C-reactive protein and a rise in the blood's antioxidant defences. In the formula, curcumin is paired with ginger (Zingiber officinale, also present), another member of the Zingiberaceae botanical family. These two rhizomes, used together for millennia in traditional medicine, present complementary activity spectra.

Selected form

Patented active

Meriva™ is a patented complex of turmeric-derived curcuminoids and sunflower-lecithin phospholipids, standardised to 18-22% total curcuminoids. These polyphenols give the turmeric rhizome (Curcuma longa) its characteristic orange colour. Extraction with food-grade ethyl acetate yields a native extract at a 30:1 ratio. The resulting complex is carried on microcrystalline cellulose (E460(i)). Turmeric has been used in Ayurvedic tradition for millennia. As curcumin is naturally fat-soluble and poorly absorbed on its own, the phospholipid carrier is an integral part of the ingredient. Preservative-free.

Formula dosage

0 to 125 mg.

Dose expressed as active substance, excluding excipients and carriers of the raw material.

Synergies in the formula

In the Singular formula, curcumin is part of a network of bioactives with complementary activities. Ginger is its historical partner. These two rhizomes of the Zingiberaceae family have been combined for millennia in Ayurvedic and Chinese traditions, and contemporary research follows them across neighbouring registers. Omega-3 EPA and DHA share a common field of study with curcumin, that of joint comfort, through distinct routes. N-acetylcysteine strengthens antioxidant defences by another path: it supplies the cysteine needed for glutathione synthesis, the main antioxidant produced by cells themselves. Sulforaphane, derived from broccoli, supports the body's natural cellular detoxification processes through a complementary mechanism. The combination of these two plant compounds covers a broad spectrum of the body's defence system.

Linked Biomarkers

Ferritinhs-CRP (High-Sensitivity CRP)ALT (SGPT)Transferrin Saturation

Safety & Precautions

Curcumin has several decades of clinical research and millennia of dietary use behind it. A phase I trial followed twenty-five people up to 8,000 mg per day for three months with no treatment-related toxicity, and 1,500 mg per day were used for twelve months with no notable adverse effect.

The most frequent adverse effects are digestive: mild gastric discomfort, nausea or diarrhoea, most often transient and dose-related. Taking curcumin with a meal reduces them.

A United States hospital network documented ten liver injuries attributed to turmeric between 2004 and 2022, including five hospitalisations and one death, with onset one to four months in and a marked genetic predisposition. Three of the seven products analysed contained piperine; the material used here contains none, its carrier being a phospholipid. Any unusual reaction early in use warrants medical advice.

Curcumin is not recommended for people taking anticoagulants or antiplatelet agents without the advice of a healthcare professional, owing to a documented effect on platelet aggregation. It is also not recommended in cases of bile duct obstruction. The Singular formula sets curcumin aside where a vitamin K antagonist, an anticancer treatment, an immunosuppressant or impaired liver function is declared in the health profile.

Pregnant or breastfeeding women should consult a healthcare professional before supplementation. People taking long-term medication should seek advice from their doctor, as curcumin may alter the metabolism of certain substances in the body.

Scientific Studies

AuthorsYearTypeJournal

Comparative absorption of curcumin formulations

Randomized double-blind crossover trial in twelve healthy volunteers, four forms given to the same people. Adjusted for dose, absorption of the phospholipid complex reaches 7.9 times that of the unformulated curcuminoid mixture; the turmeric volatile-oil combination stays at 1.3. The measurement covers total curcuminoids after hydrolysis: free curcumin remains undetectable, whatever the form.

Efficacy and Safety of Turmeric Extracts for the Treatment of Knee Osteoarthritis: a Systematic Review and Meta-analysis of Randomised Controlled Trials

Sixteen randomized trials, 1,810 adults with worn knee cartilage, over durations of up to sixteen weeks. Pain and physical function improve clearly against placebo, at a level comparable to common anti-inflammatories, with 12% fewer adverse events. The authors note strong heterogeneity and moderate risk of bias.

Antioxidant and anti-inflammatory effects of curcumin/turmeric supplementation in adults: A GRADE-assessed systematic review and dose-response meta-analysis of randomized controlled trials

Sixty-six randomized trials in adults. C-reactive protein falls by 0.58 mg/L, total antioxidant capacity rises by 0.21 mmol/L and superoxide dismutase by 20.5 u/L, while malondialdehyde, a marker of fat degradation, falls by 0.33 µmol/L. Interleukin-1 beta does not move.

Are curcuminoids effective C-reactive protein-lowering agents in clinical practice? Evidence from a meta-analysis

Six controlled trials, 342 participants. C-reactive protein falls by 6.44 mg/L against placebo. The author notes the gap holds only in two subgroups: trials using a bioavailability-improved preparation, and those lasting four weeks or more.

Diverse effects of a low dose supplement of lipidated curcumin in healthy middle aged people

Thirty-eight healthy adults aged 40 to 60, 80 mg per day of a lipidated curcumin for four weeks against placebo. Salivary radical scavenging capacity and plasma catalase rise, triglycerides and one liver enzyme fall. The lipid form used is not the one selected here, and no direct human comparison allows the two to be situated against each other.

Curcumin supplementation effect on liver enzymes in patients with nonalcoholic fatty liver disease: a GRADE-assessed systematic review and dose-response meta-analysis of randomized controlled trials

Fifteen randomized trials, 905 people with fat accumulation in the liver. Two liver enzymes fall, by 4.10 and 3.27 units per litre; a third does not move. A related analysis by the same group calls these improvements statistically clear but without assurance of clinical effect, and rates trial quality as low.

Further Evidence of Benefits to Mood and Working Memory from Lipidated Curcumin in Healthy Older People: A 12-Week, Double-Blind, Placebo-Controlled, Partial Replication Study

Eighty healthy adults aged 50 to 80, 80 mg of curcumin per day for twelve weeks against placebo. Perceived fatigue falls at four and twelve weeks, working memory improves at twelve weeks. The supplemented group shows higher blood glucose than placebo. The trial partially replicates a first 2015 study in sixty adults aged 60 to 85.

Curcumin and cognition: a randomised, placebo-controlled, double-blind study of community-dwelling older adults

Ninety-six community-dwelling older adults, 1,500 mg per day for twelve months. No difference between groups across all clinical and cognitive measures, apart from one interaction on a global test driven by a decline in the placebo group at six months. This is the longest and largest trial in this family, and it does not support a cognitive benefit.

Liver Injury Associated with Turmeric: A Growing Problem: Ten Cases from the Drug-Induced Liver Injury Network

Case series of ten liver injuries attributed to turmeric in a United States hospital network between 2004 and 2022, including five hospitalisations and one death. Onset ranges from one to four months, and seven patients carried the same genetic variant, heavily over-represented against the general population. Three of the seven products analysed contained piperine.

Curcumin: A Review of Its Effects on Human Health

Narrative review of the clinical data available on curcumin, covering joint comfort, metabolic markers and cognitive function, with a detailed analysis of absorption issues.

Frequently Asked Questions

Discover all our bioactives