What is piperine and how does it work with curcumin?
Piperine is the pungent compound of black pepper. It slows enzymes and transport proteins that break curcumin down or pump it out again, and so raises curcumin absorption. The same applies to many drugs, which is why piperine can cause interactions.
Piperine explained simply
Piperine is an alkaloid that gives black pepper (Piper nigrum) its heat. It is often added to turmeric supplements, listed as “pepper extract” or under the trade name BioPerine®.
How does the “pepper trick” work?
Curcumin has a basic problem: it barely dissolves in water, is poorly absorbed in the gut and is quickly converted and excreted by the liver (see glucuronidation). Piperine intervenes at two points:
- It inhibits liver enzymes such as CYP3A4 and glucuronidation enzymes. Curcumin is broken down more slowly.
- It inhibits the transport protein P-glycoprotein, which pumps substances out of cells back into the gut lumen.
The result: more curcumin stays in the blood. A 1998 study by Shoba and colleagues is often cited, in which participants received 2 g curcumin with and without 20 mg piperine. With piperine, absorption was about 20 times higher (the well-known “2000%” figure). It is a small, older study with eight participants and blood sampling over only six hours; its result cannot be transferred to every product.
Because piperine slows the breakdown not only of curcumin but of many drugs, their blood levels may rise. This concerns, for example, anticoagulants, blood-pressure and heart medication, certain antidepressants or drugs with a narrow therapeutic range. If you take medication regularly, discuss piperine-containing products with your doctor or pharmacist beforehand. This text is not medical advice.
Alternatives without piperine
Piperine is not the only way to improve curcumin bioavailability. Other approaches use formulations that make curcumin more water-compatible: micelles, phospholipid complexes or inclusion complexes with cyclodextrin. Whether they affect liver enzymes depends on the formulation and has been studied to differing degrees. Curcumin+ from 2 Kapseln Bitte uses a curcumin–γ-cyclodextrin complex and contains no piperine. Which form suits you also depends on the medication you take and on tolerability; some people find piperine irritating to the stomach.
What do studies say about piperine and curcumin?
The evidence is nuanced. The older study by Shoba et al. (1998) found strongly increased curcumin absorption when piperine was given at the same time. A later study with 30 participants (Fança-Berthon et al., 2021) found no significant difference between a piperine combination and a standard extract, at least for unconjugated curcuminoids. Absorption also depends on whether curcumin is free or in a formulation.
In practice this means that higher absorption is not automatically an advantage if it comes with slower metabolism of other substances. The effect on liver enzymes is also dose-dependent; how strong it is in an individual cannot be predicted. Whether the combination makes sense therefore depends on your personal situation.
Frequently asked questions
How much piperine is in black pepper? Depending on the variety, roughly a few percent. A pinch in food gives far less than the amounts used in studies.
Is piperine harmful? As a spice in culinary amounts it is considered unproblematic. Questions arise mainly with concentrated products and concurrent medication.
How do I spot piperine on a label? Look for “piperine”, “Piper nigrum”, “black pepper extract” or “BioPerine®” in the ingredient list.
