Long Pepper: Species, Trikatu and Safety

Three questions decide whether anything else written about long pepper applies to the jar in your kitchen or the capsules in your cupboard. Which plant is it actually? What is it mixed with? And at what dose?

None of these is pedantry. "Long pepper" is sold under that name for at least two different Piper species. The overwhelming majority of "piperine" research was done on a third species entirely — black pepper. Long pepper is almost never taken alone, but as one third of the Ayurvedic formula Trikatu, which concentrates piperine from two sources at once. And the gap between grating a spike over dinner and swallowing a 20 mg standardised piperine capsule daily is the gap between a spice and a pharmacological agent.

This page sorts all of that out, then gives the full safety picture — including the piperlongumine literature, which is genuinely interesting laboratory science and is routinely misrepresented as something it is not.

Three Species, One Word
Whose Research Is It Anyway?
Piperlongumine Is Not Piperine
Trikatu: The Three Pungents
Why the Formula Wrecks the Evidence
Forms, and What Each One Actually Delivers
The Dose Gap: Spice Versus Capsule
Drug Interactions: The Headline Risk
Gastric Irritation
Pregnancy, Breastfeeding and Fertility
Other Cautions
Quality, Authentication and Adulteration
Evidence Tiers
Key Research Papers
Connections

Three Species, One Word

Piper longum L. — true long pepper, Ayurvedic pippali, Chinese bi ba, Vietnamese tiêu lốt, Tamil thippili, French poivre long. Native to the Indian subcontinent. The part used is not a berry but a hard grey-brown spike, one to three centimetres long, of dozens of tiny fruits fused along a central axis. Contains piperine and, distinctively, piperlongumine. This is the species every Ayurvedic reference to pippali means.

Piper retrofractum Vahl — Javanese or Balinese long pepper, cabai jawa, Thai dee plee. A different species with a similar spike, widely sold as "long pepper" in Indonesian and Thai markets and standard in Indonesian jamu. Spikes are typically longer, more slender and more sharply tapered than P. longum's. Also piperine-bearing, chemically similar, but not the same plant. Research on one does not automatically transfer to the other, and a great deal of Southeast Asian ethnobotanical writing about "long pepper" is about this species.

Piper nigrum L. — black pepper. Same genus, same family, different species, round individual drupes. Usually the richer source of piperine by dry weight. Does not contain meaningful piperlongumine. This is the species that generated most of the piperine research literature.

And then the impostors, which matter because they have all been sold under overlapping "pepper" names:

Capsicum species — chillies, bell peppers, paprika, cayenne. Nightshade family, not Piperaceae. Contain capsaicin, not piperine. Nothing on any of these pages applies to them. They inherited the word "pepper" because long pepper reached Europe first and lent its name to everything pungent that followed.
Piper cubeba — cubeb or "tailed pepper," a round fruit on a stalk. A real Piper, a different drug.
Zanthoxylum — Sichuan pepper, a citrus relative. Produces tingling numbness, contains no piperine.
Schinus — pink peppercorns. Not a pepper at all.
Aframomum melegueta — grains of paradise, a ginger relative.

One more distinction inside the species. The roots and thicker stems of P. longum are a separate Ayurvedic drug — pippali mula or granthika — with its own indications. If you buy "pippali" you almost always get the dried fruit spikes. Do not assume the root is interchangeable with the fruit.

Whose Research Is It Anyway?

This is the single most important caveat for reading anything about long pepper, including this site.

Most "piperine" research is black-pepper research. The enzyme-inhibition studies, the human pharmacokinetic crossovers, the review literature — overwhelmingly conducted with piperine isolated from or attributed to Piper nigrum, because black pepper is cheap and globally available. When a long pepper product's marketing cites "extensive clinical research on piperine," that research was mostly done on the other species.

How much of it transfers?

Molecular findings transfer cleanly. Piperine is one compound. Piperine from P. longum and piperine from P. nigrum are chemically identical. A study showing piperine inhibits human CYP3A4 tells you something true about the piperine in long pepper.
Dose does not transfer. "A study used 20 mg piperine" and "I ground a long pepper spike over dinner" are not commensurable. Piperine content varies with species, cultivar, harvest, ripeness and storage age.
Whole-plant findings do not transfer. P. longum carries piperlongumine, piperlonguminine, pipernonaline, piperettine, guineensine, lignans and an essential oil. Some of these amides also touch drug-metabolising enzymes in laboratory work. A whole-spice exposure is not a single-molecule exposure, and the two species' whole-spice profiles differ.
Nobody has run the head-to-head human comparison of P. longum against P. nigrum against P. retrofractum at matched doses.

The best correctives are the species-specific reviews: Yadav and colleagues in the Journal of Ethnopharmacology in 2020 and Biswas and colleagues in Phytotherapy Research in 2022, both of which are explicitly about Piper longum rather than about piperine in general. If you read one thing from the primary literature, make it one of those.

Piperlongumine Is Not Piperine

Conflating these two compounds is the most common factual error in popular writing about long pepper, and it is worth being precise because the mistake is used to sell things.

Piperine is the pungent amide alkaloid shared with black pepper. It is responsible for the bite and for the bioavailability effect. It is not the compound in the cancer research literature.

Piperlongumine (also called piplartine) is a different amide alkaloid, present in Piper longum and essentially absent from Piper nigrum. It carries a reactive electrophilic centre that forms covalent bonds with cysteine thiol groups on proteins, including enzymes that manage cellular glutathione and oxidative stress.

The research story, told accurately. Raj and colleagues published a screen in Nature in 2011 identifying piperlongumine as a small molecule that selectively kills cancer cells by targeting the stress response to reactive oxygen species. The logic is elegant: cancer cells typically run at higher baseline oxidative stress and lean harder on their antioxidant defences, so a compound that disables those defences may kill the cancer cell while sparing the normal one. That paper turned an obscure plant amide into one of the more heavily worked natural-product leads of the past fifteen years. Piska and colleagues reviewed the synthetic-analogue effort in the European Journal of Medicinal Chemistry in 2018; Duarte and colleagues reviewed the antitumour literature in Pharmaceuticals in 2023. Tier: preclinical — cell lines and mouse xenografts.

What has not happened, fifteen years on. There is no completed randomised trial showing that piperlongumine treats any cancer in a human being. It remains a preclinical lead compound, which is the normal fate of the overwhelming majority of such compounds. And critically: the concentrations used in those studies are pharmacological doses of purified compound applied to cells or injected into mice. Eating long pepper does not produce them, and nobody has shown that dietary or supplemental long pepper achieves meaningful piperlongumine levels in human tissue.

Two things follow, and the second one is the dangerous part. First, any product marketed on the strength of the Nature paper is overselling a laboratory finding. Second — and this is where the mechanism turns on itself — piperine-containing supplements can raise blood levels of oral chemotherapy drugs and targeted cancer therapies, many of which are CYP3A4 and P-glycoprotein substrates with narrow therapeutic windows. So a supplement taken because of a cancer paper may interfere with actual cancer treatment. Do not add long pepper, Trikatu or piperine supplements during cancer treatment without asking the oncology team.

Piperlongumine is also sold as a research chemical and increasingly as a supplement. There is no human dosing data and no chronic safety data. This site does not recommend it.

Trikatu: The Three Pungents

Trikatu means "three pungents," and it is the single most common context in which long pepper is actually consumed as medicine:

Pippali — long pepper fruit (Piper longum)
Maricha — black pepper (Piper nigrum)
Shunthi — dried ginger (Zingiber officinale)

Classically in equal parts. Its stated traditional purpose is instructive: Trikatu is not primarily intended to treat the condition. It is added to kindle digestive fire (agni), clear ama, and improve the action of the other ingredients in a formula. That third function has a name — yogavahi, a carrier that enhances what it is combined with. Trikatu is consequently folded into an enormous number of larger Ayurvedic compound preparations as an adjuvant rather than as the active drug. Johri and Zutshi reviewed the formula and its constituents in the Journal of Ethnopharmacology in 1992.

The pharmacological reading of that tradition is uncomfortable and important. Trikatu contains two piperine-bearing species. Its explicit purpose is to increase the bioavailability of whatever it is taken with. Modern pharmacology has confirmed the mechanism — see the bioavailability page. Which means:

Trikatu is the most concentrated realistic route by which a person encounters a meaningful piperine dose, and it is designed to amplify everything else you swallow — including your prescription medication. If you take an Ayurvedic compound formula that lists Trikatu, pippali or maricha among its ingredients, you are taking a bioenhancer, whether or not the label uses that word. Read the drug interactions page.

Why the Formula Wrecks the Evidence

Trikatu creates a methodological problem that no amount of careful reading can fully solve, and it is worth understanding as a general lesson about traditional-formula evidence.

Attribution is impossible in a three-herb mix. Ginger has genuinely good human evidence for nausea and reasonable evidence for digestive symptoms — see the ginger nausea page. If a Trikatu preparation helps someone's digestion, ginger is at least as plausible a cause as long pepper.
Both peppers contribute the same molecule. Piperine from pippali and piperine from maricha are indistinguishable, so you cannot even separate the two Piper contributions.
The formula's own purpose is amplification. In a larger compound preparation, the honest null hypothesis is that Trikatu did nothing itself and simply delivered more of the other ingredients. The tradition says as much.
Trikatu is added to formulas whose composition is often unstated. Many clinical reports test proprietary multi-herb preparations, open-label, in small numbers.

Practical rule when you read anything about long pepper's benefits: ask what was actually administered. If the answer is Trikatu, a compound formula, or "an Ayurvedic preparation," the result is about that preparation and not about Piper longum. Almost nothing in the traditional literature tests long pepper alone. That is not a reason to dismiss the tradition; it is a reason to be precise about what it does and does not demonstrate.

Forms, and What Each One Actually Delivers

Whole dried spikes. The best form for cooking and the most stable in storage — they keep for years. Buy these. Should be firm, dry, uniformly grey-brown and aromatic when scratched. Grate on a microplane, grind in an electric spice mill (a mortar struggles; the spikes are tough), or drop whole into a braise and remove before serving. Piperine delivered: a few milligrams at most, spread across a dish and several people.
Ground long pepper. Convenient, loses aroma fast, and the form most likely to be adulterated or to be the wrong species. Buy small quantities.
Pippali powder (Ayurvedic grade). Sold by weight by Ayurvedic suppliers, traditionally taken with honey, ghee or warm water. Traditional dosing is roughly 0.5 to 1 g of powder per day, with food. Piperine delivered: on the order of a few tens of milligrams, depending on content.
Trikatu. Powder, tablet or capsule. Concentrates piperine from two species. Similar total daily amounts to pippali powder.
Standardised piperine extracts. Usually around 95% piperine, often under a trade name, typically dosed at 5 to 20 mg. This is the form with real interaction potential. A 20 mg capsule delivers far more piperine than any plausible meal, deliberately, daily, aimed squarely at the mechanism.
Piperine inside a turmeric or curcumin product. The commonest exposure of all, and the one people forget they have. Check the "other ingredients" line.
Piperlongumine. Sold as a research chemical and increasingly as a supplement. No human dosing data, no chronic safety data. Not recommended.
Pippali mula (root). A distinct Ayurvedic drug with its own indications. Not interchangeable with the fruit.

The Dose Gap: Spice Versus Capsule

Almost every disagreement about long pepper's safety dissolves once this distinction is made explicit, so it gets its own section.

Culinary exposure. One grated spike seasons a dish for several people. Long pepper is a low single-digit percentage piperine by dry weight. The resulting per-person piperine intake is small, taken with a large volume of food, at irregular intervals. Human populations have eaten Piper spices daily for millennia without pepper being recognised as a drug-interaction problem. None of the cautions on this page are about your pepper mill.

Supplemental exposure. A standardised extract at 95% piperine, 5 to 20 mg per capsule, taken every day, frequently timed to coincide with something else you want absorbed. That is a deliberate, repeated, concentrated pharmacological exposure. Trikatu sits between the two, closer to the supplement end because it concentrates two piperine sources.

Why the gap matters for interpreting dose figures. The famous 20 mg piperine dose comes from the Shoba 1998 curcumin study, not from any dose-finding work on piperine itself. It became the industry standard by citation rather than by optimisation. And more is not better: enzyme inhibition saturates, so extra piperine buys progressively less enhancement, while gastric irritation and interaction risk keep climbing. The benefit curve flattens; the harm curve does not.

The traditional posture was more cautious than the modern one. Classical Ayurveda used pippali vardhamana — a graded regimen escalating and then de-escalating over weeks — rather than a fixed dose taken indefinitely. Modern supplement labels generally propose the opposite. When the tradition is more conservative than the product, that is worth noticing.

Drug Interactions: The Headline Risk

Summarised here; the full treatment is on the drug interactions page, which is the most clinically important page in this set.

Piperine inhibits CYP3A4, P-glycoprotein and intestinal glucuronidation. Human pharmacokinetic studies have documented raised blood levels of phenytoin, carbamazepine, propranolol, theophylline, rifampicin and nevirapine. By mechanism, the classes of concern include immunosuppressants (ciclosporin, tacrolimus, sirolimus), many statins, certain calcium-channel blockers, some benzodiazepines and other CNS drugs, digoxin, direct oral anticoagulants, some antiretrovirals and azole antifungals, oral cancer drugs, and anything with a narrow therapeutic index.

The one-line version: a supplement sold specifically to make other substances absorb better will do that to prescription medicines too, and nobody adjusts the dose for it.

What to do: if you take any regular medication, tell your prescriber or pharmacist that you are taking a piperine-containing supplement and give them the milligram figure from the label. A useful heuristic — if your medication leaflet warns you about grapefruit, it is very likely a CYP3A4 substrate, and piperine deserves the same conversation. Separating doses by several hours reduces but does not eliminate the interaction, because hepatic CYP3A4 inhibition outlasts the encounter in the gut.

Gastric Irritation

The most common adverse effect, and entirely predictable from the mechanism: long pepper stimulates gastric secretion and is a pungent irritant to mucous membranes.

Reflux and heartburn. If spicy food reliably triggers your reflux, long pepper will too. See the GERD page.
Gastritis and peptic ulcer. Commonly aggravated. Avoid medicinal doses during an active flare.
Haemorrhoids and inflammatory bowel conditions. Traditionally avoided, and the reasoning — a hot irritant on inflamed mucosa — is sound.
Concentrated piperine on an empty stomach is considerably harsher than the same compound spread through a plate of food. Take capsules with food if you take them at all.

Note that both traditions independently restricted it on these grounds. TCM specifies bi ba for cold abdominal patterns rather than hot, inflamed ones. Ayurveda classes pippali as heating and restricts it accordingly. Tradition and mechanism agree here, which makes this caution unusually well founded.

Pregnancy, Breastfeeding and Fertility

Avoid medicinal doses of long pepper, pippali and Trikatu in pregnancy. The reasons stack:

Traditional caution. Long pepper is classed as strongly heating in Ayurveda and is generally avoided in pregnancy; it appears in the traditional emmenagogue category — substances reputed to stimulate menstrual flow — which is a category traditional systems themselves flag as unsuitable during pregnancy. Tier: traditional use.
Animal reproductive-toxicity signals. Malini and colleagues reported effects of piperine on the testes of albino rats in the Journal of Ethnopharmacology in 1999, and there is further rodent literature raising concerns about high-dose piperine and reproductive outcomes. Tier: preliminary (animal), high doses of isolated piperine. These are not human findings and the doses are far above dietary ones — but for pregnancy, an unresolved animal signal plus no human data is a straightforward reason to abstain.
The interaction profile itself. Pregnancy commonly involves medication — antiemetics, thyroid replacement, insulin, antihypertensives, antiepileptics — and a bioenhancer alongside carefully dosed medication in pregnancy is a bad combination on principle.
No human safety data for medicinal doses of long pepper in pregnancy exists. None.

Breastfeeding: no safety data for medicinal doses. Avoid supplements.

Fertility: the rodent testicular findings are the reason this comes up. There is no human evidence that culinary pepper affects fertility, and no reason to think it does. If you are actively trying to conceive, there is also no reason to be taking a high-dose piperine supplement.

Culinary amounts of long pepper in food are not a realistic concern in any of these situations. Pregnant people in South Asia eat Piper spices routinely. It is supplements that these cautions address.

Other Cautions

Children. Culinary use is fine. Do not give concentrated piperine supplements to children — there is no dosing or safety data, and children's medications are dosed tightly, which makes an unmeasured bioenhancer a particularly poor idea.
Surgery. Stop piperine supplements about two weeks before a planned procedure and tell the surgical and anaesthetic team. Anaesthetic agents include CYP3A4 substrates, and high-dose piperine has shown antiplatelet activity in laboratory work.
Bleeding risk. Beyond the anticoagulant interaction, the antiplatelet signal above argues for caution in anyone with a bleeding disorder or on antiplatelet therapy.
Allergy. Uncommon but real — Piper allergy exists. Stop if you develop rash, itching or swelling.
Liver and kidney disease. Impaired first-pass metabolism is exactly the condition under which a CYP3A4 inhibitor is least predictable. Ask a clinician before taking piperine supplements, and see liver function tests.
Acute toxicity is low. Piyachaturawat and colleagues reported on the acute and subacute toxicity of piperine in mice, rats and hamsters in Toxicology Letters in 1983 — the compound is not acutely very toxic at the doses examined. Tier: preliminary (animal). Low acute toxicity is not the same as safe chronic use, and it says nothing about interactions.
Long-term daily use is uncharacterised. The human data on piperine are almost all single-dose or short-course. What daily 20 mg piperine does to CYP3A4 activity over months or years is unknown. Traditional practice used graded, time-limited courses.
What long pepper is not. It is not a treatment for cancer, asthma, diabetes, or any diagnosed disease. It is a spice with one well-documented pharmacological property — enhancing absorption of other things — and a large, entirely preclinical literature suggesting other possibilities.

Quality, Authentication and Adulteration

Long pepper has been adulterated for as long as it has been traded — Pliny the Elder complained about it in the first century CE, which is what you expect for the most expensive item in a category. It was then roughly four times the price of black pepper. The incentives have not changed.

What to watch for:

Species substitution. Piper retrofractum is frequently sold as Piper longum. Look for the species name on the label. Absence of a binomial is itself informative.
Buy whole spikes, not powder. Whole spikes can be inspected; powder cannot. Whole also keeps far longer.
What good spikes look like: firm, dry, uniformly grey-brown, one to three centimetres, with a fine regular pattern of bumps, and clearly aromatic when scratched. Musty, soft, pale or unscented means old or badly stored.
For supplements: look for a stated piperine content in milligrams, a named species, and third-party testing. "Proprietary blend" with no piperine figure means an undisclosed dose of a CYP3A4 inhibitor, which is a fair reason to choose a different product.
Reputable suppliers. Indian and Southeast Asian groceries and specialist spice merchants are generally better sources than general-purpose online marketplaces, where species labelling is least reliable.

Evidence Tiers

Piperine inhibits human CYP3A4, P-glycoprotein and intestinal glucuronidation — preclinical, human proteins, replicated.
Piperine raises blood levels of several named prescription drugs in humans — multiple small human pharmacokinetic studies.
Piperlongumine selectively kills cancer cells — preclinical (cell lines, mouse xenografts). No human trial evidence of treating any cancer.
Dietary or supplemental long pepper achieves active piperlongumine levels in human tissue — not established.
High-dose piperine affects rodent reproductive tissue — preliminary (animal), doses far above dietary.
Piperine has low acute toxicity in rodents — preliminary (animal), 1983. Says nothing about chronic use or interactions.
Long pepper is unsafe in pregnancy at medicinal doses — traditional caution plus an animal signal plus absent human data. Precautionary, not demonstrated.
Long pepper aggravates reflux, gastritis and ulcers — mechanistically expected and consistent with both traditional restriction and ordinary clinical experience with pungent spices.
Trikatu results attribute to long pepper — not established, and structurally unresolvable in a three-herb formula whose stated job is amplification.
Culinary use of long pepper is safe — supported by two millennia of dietary use across several populations, which is the strongest safety evidence available for any plant food.

Key Research Papers

Each entry links a live PubMed topic search rather than a fixed record.

Yadav V, Krishnan A, Vohora D. "A systematic review on Piper longum L.: bridging traditional knowledge and pharmacological evidence for future translational research." Journal of Ethnopharmacology, 2020. Species-specific rather than piperine-generic — the correct starting point. Systematic review. — PubMed search
Biswas P, Ghorai M, Mishra T, et al. "Piper longum L.: a comprehensive review on traditional uses, phytochemistry, pharmacology, and health-promoting activities." Phytotherapy Research, 2022. Best current survey of the amide alkaloid chemistry. Review. — PubMed search
Johri RK, Zutshi U. "An Ayurvedic formulation 'Trikatu' and its constituents." Journal of Ethnopharmacology, 1992. The formula, and the confound it creates. Review and preclinical. — PubMed search
Raj L, Ide T, Gurkar AU, et al. "Selective killing of cancer cells by a small molecule targeting the stress response to ROS." Nature, 2011. The piperlongumine paper — and still preclinical fifteen years later. Preclinical: cells and mouse xenografts. — PubMed search
Piska K, Gunia-Krzyżak A, Koczurkiewicz P, et al. "Piperlongumine (piplartine) as a lead compound for anticancer agents — synthesis and properties of analogues: a mini-review." European Journal of Medicinal Chemistry, 2018. Documents the scale of the medicinal-chemistry effort, and that it remains lead optimisation. Review, preclinical. — PubMed search
Duarte ABS, Gomes RC, Nunes VRV, et al. "The antitumor activity of piplartine: a review." Pharmaceuticals, 2023. Current summary; note the absence of human trial endpoints. Review, preclinical. — PubMed search
Bhardwaj RK, Glaeser H, Becquemont L, et al. "Piperine, a major constituent of black pepper, inhibits human P-glycoprotein and CYP3A4." The Journal of Pharmacology and Experimental Therapeutics, 2002. The interaction mechanism. Preclinical, human proteins. — PubMed search
Malini T, Manimaran RR, Arunakaran J, et al. "Effects of piperine on testis of albino rats." Journal of Ethnopharmacology, 1999. The rodent reproductive signal behind the pregnancy and fertility cautions. Preliminary (animal), high dose. — PubMed search
Piyachaturawat P, Glinsukon T, Toskulkao C. "Acute and subacute toxicity of piperine in mice, rats and hamsters." Toxicology Letters, 1983. The classical acute-toxicity work. Preliminary (animal). — PubMed search
Sunila ES, Kuttan G. "Immunomodulatory and antitumour activity of Piper longum Linn. and piperine." Journal of Ethnopharmacology, 2004. One of the studies that used the correct species. Preliminary (animal). — PubMed search
Srinivasan K. "Black pepper and its pungent principle-piperine: a review of diverse physiological effects." Critical Reviews in Food Science and Nutrition, 2007. The standard piperine review — and a clear example of the borrowed-evidence problem, since it is about the other species. Review. — PubMed search
Shoba G, Joy D, Joseph T, et al. "Influence of piperine on the pharmacokinetics of curcumin in animals and human volunteers." Planta Medica, 1998. The 20 mg figure that ended up on supplement labels worldwide. Small human PK study. — PubMed search

Live PubMed Topic Searches

External Resources

National Center for Complementary and Integrative Health — US government summaries on herbs, Ayurveda and supplement safety.
PubChem — chemical records for piperine and piperlongumine.
US Food and Drug Administration — dietary supplement regulation and safety alerts.
PubMed — the literature index behind every citation above.

Connections

All Herbs
Long Pepper — the main article: botany, names, the Roman price list, compounds and dosage.
Piperine and Bioavailability — the mechanism Trikatu was built around.
Piperine and Drug Interactions — the same mechanism as a hazard; the page to read if you take medication.
Digestive and Respiratory Uses — the traditional indications, with the formula confound applied.
Black Pepper — Piper nigrum, Trikatu's second pungent and the source of most piperine research.
Black Pepper: Sources and Safety — the parallel safety discussion for the other Piper.
Black Pepper Benefits — the companion Benefits set for the sibling species.
Ginger — Trikatu's third pungent, and the ingredient most likely responsible for its digestive effects.
Ginger: Nausea Relief — what a well-evidenced herbal claim looks like, for calibration.
Curcumin — carries its own broad enzyme-inhibition profile; a combination product has two interaction risks.
Turmeric — the supplement most likely to be delivering you piperine already.
GERD — the commonest reason to leave this spice alone.

Safety note and disclaimer. This page is educational and is not medical advice. Long pepper's most marketed property and its most serious hazard are the same mechanism: piperine inhibits CYP3A4 and P-glycoprotein, so a piperine, Trikatu or standardised long pepper supplement can raise blood levels of prescription medicines — and nobody adjusts the prescription for a supplement your prescriber does not know about. If you take any medication, especially one with a narrow margin between an effective and a harmful dose, speak to your prescriber or pharmacist and show them the label. Avoid medicinal doses in pregnancy and breastfeeding; avoid concentrated piperine supplements in children; stop supplements about two weeks before surgery; and expect aggravation if you have reflux, gastritis, ulcers or an inflammatory bowel condition. Piperlongumine is a preclinical laboratory compound, not a cancer treatment, and piperine supplements can interfere with oral cancer drugs. Long pepper is not a treatment for any disease, and nothing here should be used to delay or replace medical care. Culinary use of long pepper as a spice is a much smaller exposure and is not the subject of these cautions.

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