Also known as: Black pepper extract, Piper nigrum, BioPerine, Bioperine
BotanicalGood evidence
The pungent alkaloid in black pepper, included in formulas not for its own effects but to slow the breakdown of other ingredients. A potentiator rather than an active — and that distinction cuts both ways.
Typical dose
5.0–20.0 mg per day
At the same time as the compound it is intended to enhance
What it is
Piperine is the alkaloid responsible for the pungency of black pepper, making up roughly 5 to 9 per cent of the peppercorn. Supplements use a standardised extract, typically 95 per cent piperine, at small doses.
It appears in formulas for a different reason than almost anything else in this index. It is included not because of what it does on its own, but because of what it does to everything taken alongside it.
That makes it genuinely useful in some combinations, most famously with curcumin, and genuinely worth thinking about in others. A compound that increases how much of something reaches your bloodstream is not automatically a good thing to add to everything.
How it works
Piperine inhibits several of the enzyme systems the body uses to break down and clear compounds, both in the gut wall and in the liver. When those enzymes are slowed, more of a co-ingested compound survives the first pass and reaches circulation.
It also inhibits a transporter that actively pumps compounds back out of intestinal cells into the gut, which is a second, independent route to improved absorption.
Piperine additionally slows gut transit slightly, allowing more time for absorption. None of these mechanisms are selective — piperine does not distinguish between the compound you want absorbed and anything else passing through at the same time. This is the crux of both its usefulness and its main caution.
What the evidence shows
The bioavailability effect is well demonstrated. The most cited work reported a very large increase in curcumin absorption when piperine was co-administered, and improved absorption has been shown for a range of other compounds.
Evidence for piperine having meaningful benefits of its own is much thinner. Claims around metabolism and body composition rest largely on cell and animal work and do not translate into anything convincing at supplemental doses.
The fair summary is that piperine does exactly one thing well, and that thing is useful when paired with a poorly absorbed compound. Judging it on anything else overstates it.
Dosing
Effective doses are small: 5-20 mg alongside whatever you want absorbed. The widely used figure is 20 mg with curcumin, and more is not better here.
Take it at the same time as the compound it is meant to help. Taken separately it does nothing useful.
One genuine consideration: because piperine is not selective, it will also increase absorption of anything else you happen to take at the same time. If you take regular medication, do not take piperine-containing supplements alongside it without checking first. Enhanced-absorption curcumin formats achieve their effect without piperine, which sidesteps the issue entirely.
At a glance
Common forms
95% piperine extract, BioPerine, Within curcumin formulas, Black pepper fruit extract
Half-life / duration
Enzyme inhibition persists for several hours after a dose
Timing
At the same time as the compound it is intended to enhance
Competition status
Permitted — not on the WADA Prohibited List
Category
Botanical
Safety and side effects
At the small doses used in supplements piperine is well tolerated, and black pepper has a long history of dietary use. Digestive irritation and heartburn are the occasional complaints.
The meaningful consideration is the interaction potential, and it deserves stating plainly rather than burying. Piperine raises how much of other compounds reaches the bloodstream, and it cannot tell the difference between a supplement and a prescription medicine. If you take any regular medication, check before using piperine-containing products.
Who should avoid it
Speak to your doctor before use if you take any regular medication — piperine increases how much of other compounds reaches the bloodstream, and does not distinguish between them. Separate from medication by several hours if you use it. Not established for use in pregnancy or breastfeeding. Take care if prone to heartburn.
This entry is provided for information only. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Consult a qualified healthcare professional before use if you are pregnant, breastfeeding, taking medication or under medical supervision.
