Black Pepper (Piper nigrum)
Black pepper (Piper nigrum) is a flowering vine of the Piperaceae family whose dried unripe berries are the world's most-traded spice. Piperine, the principal alkaloid, is the bioactive studied for its broad effects on drug-metabolising enzymes and intestinal absorption. There are no authorised UK food-supplement health claims for black pepper. Piperine-containing supplements can affect prescription-medicine handling — disclose use to your prescriber.
Camden Medicals editorial · Last reviewed 3 May 2026 · Next review November 2026
- Cross-checked against
- NHS
- NICE
- BNF
- EFSA
- FSA
Camden's editorial team independently graded each health claim below on the strength of the published evidence — see the grade beside every condition.
- Class
- Botanical
- Typical daily dose
- UK retail piperine-containing supplements supply 5–20 mg of piperine per serving (typically as 5–20 mg of 95% piperine extract, or a larger amount of lower-percentage extract). The Shoba 1998 curcumin pairing trial used 20 mg of piperine alongside 2 g of curcumin. Camden NB-502 supplies ~10 mg of black-pepper powder per 2-cap serving (low-dose absorption support); NB-537 supplies 250 mg of 95% piperine extract per 2-cap serving (~9.5 mg piperine).
- Top use evidence
- Strong
On this page
What it is
Piper nigrum is a perennial flowering vine native to the south- western Indian Malabar coast and now cultivated across South and South-East Asia, Vietnam, Indonesia, Brazil, and West Africa. India, Vietnam, and Indonesia are the principal commercial producers. The vine produces small green berries that ripen to red; the dried unripe berry is "black pepper", the dried ripe berry with the outer pericarp removed is "white pepper", and the fresh green berry preserved in brine is "green pepper" — three commercially distinct products from one species.
The principal bioactive is piperine, an alkaloid present at roughly 4–10% of the dried berry by weight. Trace bioactives include piperettine, piperanine, chavicine, and several minor alkaloids; the volatile oils (β-caryophyllene, limonene, sabinene) carry the characteristic aroma. Modern food-supplement preparations standardise to a stated piperine percentage by HPLC. The most-studied commercial preparation is BioPerine® (Sabinsa) at 95% piperine.
Piperine is the basis of the well-known curcumin/piperine bioavailability pairing — the classical Shoba 1998 trial reported that 20 mg of piperine raised the plasma AUC of co-administered curcumin roughly 20-fold (~2000%). The same mechanism explains why piperine-containing supplements need to be approached carefully alongside prescription medicine.
Regulatory note: Black pepper is a long-standing food ingredient in the UK and EU; it has documented consumption history pre-1997 and is not a novel food. There are no authorised UK food-supplement health claims for black pepper or piperine — botanicals are on EFSA hold. UK food-supplement marketing as an "absorption enhancer" is a quasi-claim and walks close to the medicinal-borderline line; legal review is advisable for any claim wording.
At a glance
- A flowering vine (Piper nigrum) of the Piperaceae family; the dried unripe berries are the world's most-traded spice. Piperine is the principal alkaloid and bioactive.
- No UK-authorised food-supplement health claims. Piperine-containing supplements are marketed as absorption enhancers — that framing walks close to the medicinal-borderline line and is not an authorised claim.
- Standardisation is by piperine percentage by HPLC. The most-trialled commercial extract is BioPerine® (Sabinsa) at 95% piperine. Generic "black pepper extract" without a piperine percentage tells you nothing comparable.
- CRITICAL drug-interaction concern: piperine inhibits CYP3A4, CYP1A1, CYP2D6, UGT, and intestinal P-glycoprotein — affecting how the body handles many prescription medicines. Disclose use to your prescriber.
- Pregnancy: caution at standardised 95% piperine supplement doses. Culinary food doses are not the concern.
What people use it for
Adults using a curcumin / turmeric supplement and wanting trial-comparable bioavailability
The Shoba 1998 trial reported plasma curcumin AUC ~20-fold higher when 20 mg of piperine was co-administered with 2 g of curcumin. UK food-supplement marketing as an "absorption enhancer" is a quasi-claim — describe the mechanism rather than claim a body effect. People taking prescription medicine should disclose use of piperine-containing supplements. [5,6]
Some evidenceStrongAdults using an adaptogen stack (e.g. shilajit + ashwagandha + rhodiola) and seeking absorption support
Conventional in adaptogen stacks, where the breadth of piperine's phase-I/phase-II inhibition is leveraged across multiple poorly-absorbed botanicals. Outcome-trial evidence for the combination as such is limited. Camden NB-537 includes 250 mg of 95% piperine extract (~9.5 mg piperine per 2-cap serving).
Some evidenceLimitedAdults on prescription medication considering a piperine-containing supplement
Talk to your prescriber first. Piperine inhibits the principal drug-metabolising enzymes (CYP3A4 etc.) and intestinal P-glycoprotein. Narrow-therapeutic-window medication (warfarin, some antidepressants, anti-epileptics, certain HIV antiretrovirals, immunosuppressants, statins) is at risk of altered plasma levels.
Popular, not provenInsufficientAdults exploring traditional Ayurvedic or culinary use
Black pepper has millennia of culinary and traditional-medicine use across the Indian subcontinent, the Mediterranean, and the Arab world. Traditional-use framing is permissible; specific UK food-supplement health claims are not authorised.
Some evidenceLimited
How it works
Piperine inhibits CYP3A4, CYP1A1, CYP1A2, CYP2D6, CYP2C9, and CYP2C19 (cytochrome-P450 phase-I drug-metabolising enzymes) and UDP-glucuronosyltransferase (UGT, phase-II conjugation), while also inhibiting intestinal P-glycoprotein efflux. The net effect is slower first-pass metabolism and reduced intestinal extrusion of co-administered compounds — including the curcuminoid bioavailability rise that the pairing is famous for, and the prescription-medicine interactions that require prescriber awareness.
Common myths
Myth"Piperine is just a bioavailability booster — it has no other effects"
RealityPiperine''s mechanism is broad inhibition of phase-I (CYP3A4 and others), phase-II (UGT) drug-metabolising enzymes, and intestinal P-glycoprotein efflux. The bioavailability rise of co-supplements is one consequence; altered plasma levels of co-administered prescription medicine is another. The "just a bioavailability booster" framing under-describes the breadth of the inhibition and is the reason prescriber-disclosure matters.
Myth"BioPerine and generic black pepper extract are the same"
RealityStandardisation is the relevant marker. BioPerine® (Sabinsa) is standardised to 95% piperine by HPLC. Generic "black pepper extract" without a declared piperine percentage delivers an undeclared dose and is not directly comparable to the trial materials.
Myth"Black pepper is safe in any amount because it's a food"
RealityCulinary use of black pepper as a spice is generally safe for most adults. Concentrated 95% piperine supplements deliver doses orders of magnitude above the per-meal supply embedded in food. The supplement form has prescription-medicine interaction implications that culinary use does not. Approach the supplement form as a supplement, not as "concentrated cooking spice".
Myth"Piperine boosts metabolism and helps with weight loss"
RealityUK food-supplement claims for metabolic rate or weight management from black pepper / piperine are not authorised. The trial literature is small and inconsistent; the popular framing exceeds the trial evidence. UK NICE NG246 lists recognised pathways for overweight and obesity management; piperine is not on those pathways. [7]
Myth"Piperine and curcumin together is a clinical treatment for inflammation"
RealityThe pairing is a bioavailability-enhancement combination, not a UK-recognised clinical anti-inflammatory therapy. Curcumin / turmeric supplements are food supplements; UK NHS / NICE pathways for diagnosed inflammatory conditions apply (NICE NG100 — rheumatoid arthritis, NG177 — osteoarthritis, etc.). Self-supplementation in place of formal management of diagnosed inflammatory disease is not appropriate. [8]
Common online questions
Synthesised from the questions UK shoppers most often ask online about Black Pepper (Piper nigrum). Each answer is editorial and links to its evidence in the Sources list below.
Why is black pepper added to so many supplements?
Piperine, the principal bioactive in black pepper, inhibits the body''s primary drug-metabolising enzymes (CYP3A4 and others) and intestinal P-glycoprotein efflux. Co-supplements that are otherwise poorly absorbed — curcumin is the classic example — see substantial increases in plasma levels when piperine is co-administered. The Shoba 1998 trial reported a roughly 20-fold rise in plasma curcumin AUC. UK food-supplement marketing of piperine as an "absorption enhancer" is a quasi-claim that walks close to the medicinal-borderline line; the underlying mechanism is well-described, but specific UK food-supplement health claims for piperine or black pepper are not authorised.
Will piperine in my supplement affect my prescription medicine?
Possibly — disclose use to your prescriber. Piperine inhibits CYP3A4, CYP1A1, CYP1A2, CYP2D6, CYP2C9, and CYP2C19 (the principal drug-metabolising enzymes), UGT (phase-II conjugation), and intestinal P-glycoprotein. Narrow-therapeutic-window medication is the priority concern: warfarin and other vitamin-K-antagonist anticoagulants, some antidepressants (especially carbamazepine, phenytoin), several anti-epileptics, certain HIV antiretrovirals, immunosuppressants (ciclosporin, tacrolimus), some statins, and chemotherapy agents. The clinical effect varies — some interactions are well-described in the literature, others are theoretical. Talk to your prescriber and pharmacist before starting any piperine-containing supplement if you take any of the above.
BioPerine® vs generic black pepper extract — does it matter?
For trial-comparable supplementation, the standardised branded preparations are what the literature has used. BioPerine® (Sabinsa) is the most-trialled, standardised to 95% piperine by HPLC. Generic "black pepper extract" or unstandardised X:1 extract at the same milligram label delivers an undeclared and lower piperine dose and is not directly comparable to the trial materials. Camden NB-537 uses 95% piperine extract.
Is the piperine in supplements the same amount as in cooking?
No — supplement doses are concentrated. A typical piperine supplement dose is 5–20 mg per serving, sourced from a small amount (~5–20 mg) of 95% piperine extract or from a larger amount of lower-percentage extract. A culinary portion of black pepper (0.1–0.5 g per meal) supplies roughly 4–25 mg piperine. The supplement form delivers a consistent piperine dose; the food form delivers piperine embedded in a complex matrix that affects absorption.
Can I take piperine supplements while pregnant?
Talk to your GP first. Animal studies in rats have reported reductions in embryonic implantation and developmental effects with piperine at doses meaningfully above the human-equivalent supplement dose; the signal is preclinical, but the conservative position is to avoid standardised 95% piperine supplements during pregnancy and lactation. Culinary use of black pepper in food is not the concern. The Camden NB-537 label specifies adults only and carries the pregnancy contraindication.
Does black pepper irritate the stomach?
Black pepper / piperine can stimulate gastric acid secretion. People with active gastritis, peptic-ulcer disease, or gastro-oesophageal reflux may experience worsened symptoms with concentrated supplement piperine. The food form is generally tolerated; the supplement form may not be. If you have any of those conditions, talk to your pharmacist or GP before starting.
🔬 Camden’s evidence review
The research Camden reviewed, graded on its strength. This is our own appraisal — it sits beneath the official guidance above, never above it.
Co-supplement bioavailability enhancement (curcumin)
StrongEvidencestrongShoba 1998 (Planta Med) reported plasma curcumin AUC roughly 20-fold higher when 20 mg of piperine was co-administered with 2 g of curcumin in a small healthy-adult cross-over trial. The effect is large, reproducible, and underpins essentially every commercial curcumin formulation marketed with "with black pepper extract" or "BioPerine®". The mechanism is well-described (CYP / UGT / P-glycoprotein inhibition). [5]
Co-supplement bioavailability enhancement (other compounds)
LimitedEvidencelimitedSmaller trials have reported piperine raising the plasma AUC of resveratrol, beta-carotene, certain B vitamins, coenzyme Q10, and some amino acids. Effect sizes are smaller than for curcumin and replication is partial.
Drug-metabolising-enzyme inhibition (CYP / UGT / P-gp)
StrongEvidencestrongMultiple in-vitro and clinical-pharmacology studies have characterised piperine''s inhibition of CYP3A4, CYP1A1, CYP1A2, CYP2D6, CYP2C9, CYP2C19, UGT, and intestinal P-glycoprotein. The mechanism explains both the bioavailability-enhancement effect of the pairing trade and the drug-interaction concern with narrow-therapeutic- window prescription medicine. UK BNF interaction guidance applies to any prescription medicine metabolised by the affected enzymes. [9,10]
Anti-inflammatory / metabolic effects in supplement studies
LimitedEvidencelimitedSmall short trials of piperine-containing extracts (often in combination with other actives) have reported effects on self-reported outcomes and some metabolic markers in healthy adults. Trial sizes are small. UK food-supplement claims for inflammation, metabolic-rate, or weight management from black pepper / piperine are not permitted.
Reproductive toxicity in animal studies
MixedEvidencemixedAnimal studies in rats have reported reductions in embryonic implantation and developmental effects with piperine at 40 mg/kg and above (multiple times the human-equivalent dose of standardised supplement preparations). The signal is preclinical and does not translate directly to human supplement-use risk, but informs the conservative pregnancy framing for standardised 95% piperine supplements.
Safety
Black pepper as a culinary spice is generally safe for most adults. Standardised 95% piperine supplements have meaningful drug-interaction implications via CYP3A4 / P-glycoprotein inhibition. Disclose use to your prescriber. Pregnancy: caution at supplement doses (food use is not the concern).
Talk to your pharmacist or GP first if you:
- You take warfarin or any vitamin-K-antagonist anticoagulant — possible additive bleeding risk via piperine's CYP2C9 inhibition.
- You take any antidepressant (SSRI, SNRI, tricyclic, MAOI) — piperine may affect plasma levels.
- You take anti-epileptic medication (carbamazepine, phenytoin, valproate, lamotrigine) — piperine may alter levels.
- You take HIV antiretrovirals — piperine may alter plasma levels via CYP3A4.
- You take immunosuppressants (ciclosporin, tacrolimus, mTOR inhibitors) — piperine may affect levels via CYP3A4 / P-gp.
- You take statins (simvastatin, atorvastatin, rosuvastatin) — piperine may alter plasma levels.
- You take chemotherapy agents — piperine may alter plasma levels; defer to oncology team.
- You have active gastritis, peptic-ulcer disease, or gastro-oesophageal reflux — piperine may worsen symptoms.
- You are pregnant, breastfeeding, or trying to conceive — caution at standardised supplement doses.
- You are under 18 — supplement use not recommended.
Common side effects: Mild GI complaints (heartburn, gastric irritation) at higher supplement doses. Generally well-tolerated at culinary doses.
Pregnancy and breastfeeding
Caution at standardised 95% piperine supplement doses. Animal studies in rats have reported reductions in embryonic implantation at piperine 40 mg/kg and above. Culinary use of black pepper in food is not the concern. Talk to your GP before using a piperine-containing supplement during pregnancy.
Caution at standardised supplement doses. Limited human safety data in lactation.
Talk to your GP, midwife, or pharmacist before starting any supplement during pregnancy or breastfeeding.
More clinical detail (for clinicians and informed readers)
Contraindications
- Active peptic-ulcer disease — relative contraindication for standardised supplement piperine.
- Pregnancy — caution; standardised 95% piperine supplements are not advisable. Culinary use of black pepper in food is not the concern.
- Lactation — caution.
- Paediatric use — not recommended for under-18s as a standardised piperine supplement.
Drug interactions
- Warfarin and other vitamin-K-antagonist anticoagulants — possible additive bleeding via CYP2C9 inhibition.
- Antidepressants — possible alteration of plasma levels.
- Anti-epileptics (carbamazepine, phenytoin, valproate, lamotrigine) — possible alteration of plasma levels.
- HIV antiretrovirals — possible alteration of plasma levels via CYP3A4 inhibition.
- Immunosuppressants (ciclosporin, tacrolimus, mTOR inhibitors) — possible alteration of plasma levels via CYP3A4 / P-gp inhibition.
- Statins (simvastatin, atorvastatin) — possible alteration of plasma levels.
- Chemotherapy agents — possible alteration of plasma levels; defer to oncology team.
- Phenytoin / theophylline — narrow-therapeutic-window medication; possible level changes.
- Beta-blockers (propranolol) — possible alteration of plasma levels.
This is not an exhaustive list. Always tell your prescriber and pharmacist about every supplement you take.
Common side effects
- Mild GI complaints — heartburn, gastric irritation; reduced by taking with food.
Rare side effects
- Allergic reaction.
- Worsened reflux symptoms in people with pre-existing GORD or peptic-ulcer disease.
How to take it
- Typical supplemental range
- UK retail piperine-containing supplements supply 5–20 mg of piperine per serving (typically as 5–20 mg of 95% piperine extract, or a larger amount of lower-percentage extract). The Shoba 1998 curcumin pairing trial used 20 mg of piperine alongside 2 g of curcumin. Camden NB-502 supplies ~10 mg of black-pepper powder per 2-cap serving (low-dose absorption support); NB-537 supplies 250 mg of 95% piperine extract per 2-cap serving (~9.5 mg piperine).
- Timing
- With the co-supplement / co-administered active that piperine is intended to enhance the absorption of. Piperine taken alone has limited supplement-context use case.
How to spot quality
Look for
- Piperine percentage declared (≥95% by HPLC is the trial-grade standard).
- Branded research-grade preparation (BioPerine®, Bioperine, or other standardised brand) for trial-matched material.
- Country of origin declared (India, Vietnam, Indonesia, Brazil are principal sources).
- Heavy-metal screening disclosed (black pepper has documented heavy-metal accumulation in some growing regions).
- Microbial screen disclosed (whole-spice supply chain has microbial contamination history).
- mg of piperine per serving stated, not just mg of black-pepper extract.
- Pregnancy contraindication on the label for standardised 95% piperine supplements.
- Drug-interaction warning on the label or PDP — piperine's CYP / P-gp profile means a prescriber-disclosure prompt is appropriate.
Red flags
- Generic "black pepper extract" or "Piper nigrum extract" at the same milligram label as standardised 95% piperine — undeclared piperine content.
- X:1 extract ratios (10:1, 20:1) marketed as potency without piperine percentage.
- No piperine percentage on label or supplement-facts panel.
- No drug-interaction warning despite standardised piperine content.
- No pregnancy contraindication on standardised 95% piperine supplements.
- Marketing as a stand-alone "metabolism booster" or "fat burner" (no UK-authorised claim).
- Marketing as a stand-alone clinical anti-inflammatory therapy.
- No country-of-origin or heavy-metal screening disclosure.
Commonly combined with
Other ingredients that share a biological pathway, cofactor relationship, or evidence-backed protocol with this one. Mechanisms below cite primary physiology — not folk pairing. Doses are literature ranges, not recommendations. Talk to your pharmacist or GP before changing your stack, especially if you take prescription medication.
Turmeric (Curcuma longa)
Strong evidenceThe famous bioavailability pairing — piperine raises curcumin plasma AUC roughly 20-fold via CYP / UGT / P-glycoprotein inhibition.
Piperine, the principal alkaloid in black pepper (Piper nigrum), inhibits glucuronyl-transferase activity in the gut wall and liver, slowing the first-pass metabolism of co-administered compounds. Curcumin (the principal curcuminoid in turmeric) is a classic example of a poorly-bioavailable polyphenol whose plasma AUC rises roughly 20-fold (~2000% in Shoba 1998) when co-administered with piperine. The mechanism extends beyond curcumin — piperine also enhances bioavailability of resveratrol, certain B vitamins, beta-carotene, and several prescription medications. The breadth of the inhibition is also why the combination requires care with prescription medicines metabolised by the same pathways (warfarin, some antidepressants, several anti-epileptics).
Evidence: Shoba 1998 (Planta Med) is the canonical bioavailability study. Effect is large and reproducible. The pairing is the basis of every commercial curcumin formulation that includes "BioPerine" or "with black pepper extract." Camden NB-502 mushroom complex includes 40 mg of turmeric and 10 mg of black pepper at a sub-trial-comparable dose (the complex is positioned as a blend, not as a clinical-grade curcumin/piperine pairing). [5]
Doses studied: 5–20 mg piperine (often as BioPerine®) with 500–1000 mg curcumin (≥95% curcuminoid extract) daily; check for prescription-medicine interactions before starting
Found in Camden: Mycofera™ Mushroom Complex 120 Capsules
Ashwagandha (Withania somnifera)
Limited evidencePiperine added to ashwagandha-containing stacks for absorption support; KSM-66 itself does not require piperine for trial-comparable bioavailability.
The KSM-66 root extract has been studied at doses of 300–600 mg/day without piperine; the addition of piperine in multi-active stacks is conventional but not necessary for the ashwagandha component to reach trial-comparable plasma levels.
Evidence: Convention-driven inclusion in adaptogen stacks. Camden NB-537 includes both KSM-66 ashwagandha (125 mg/2-cap) and 250 mg of 95% piperine extract.
Doses studied: 5–20 mg piperine alongside ashwagandha 300–600 mg.
Found in Camden: Aurifera™ Shilajit Adaptogen Complex 90 Capsules