Piperine (BioPerine) benefits, side effects and interactions: what the evidence shows

Piperine is the alkaloid (a nitrogen-containing plant compound) that makes black pepper taste hot; black pepper is about 2% to 7.4% piperine by weight ¹³. People rarely take it for itself. It is added to supplements because it slows the gut and liver systems that clear many compounds from the body, so more of whatever is swallowed with it reaches the blood ¹². That is useful for poorly absorbed curcumin ², and a real concern for medicines: in small human studies, piperine raised blood levels of drugs for epilepsy, blood pressure, asthma and HIV ³⁴⁵⁶. Germany's Federal Institute for Risk Assessment (BfR) reviewed the evidence in 2021 and urged caution about isolated piperine taken as a single concentrated dose ¹.

What is piperine?

Piperine comes from the fruit of black pepper and its relative long pepper ¹. For the basics, what it is and what it does in your body has its own page, and this guide covers the evidence, the medicines that have been tested with it, how much studies use, when and how to take it, pepper in food vs a capsule, and side effects.

What piperine is good for: the evidence, graded

We grade each use by the quality of the human research. Strong means several good randomized trials or a meta-analysis agree; Moderate means several randomized trials, mostly positive but small or short; Limited means few or small trials, or mixed results; Early means lab, animal or a single pilot study; Not supported means good trials found no benefit. Our supplements explainer says more about grading.

What is piperine good for, then?

Mostly as a helper. The best-known human study, from 1998, gave healthy volunteers 2 g of curcumin with or without 20 mg of piperine. Alone, curcumin levels were undetectable or very low; with piperine they were much higher from 15 minutes to 1 hour after the dose, and total bioavailability rose by 2,000% ². A small 2000 study gave men 120 mg of CoQ10 with 5 mg of piperine or placebo for 21 days and found about 30% more CoQ10 in the blood; shorter tests did not reach significance ⁸. Our CoQ10 guide covers whether more CoQ10 in the blood helps.

What piperine does on its own in people is mostly unknown. Reviews list antioxidant, digestive, metabolic and other effects, but these come from cells and animals ¹²¹³. The BfR noted that the few human studies of isolated piperine were not designed to check its safety beyond drug interactions ¹.

Piperine interactions: the medicines that have been tested

Piperine's interaction record comes from small, short studies, but they point the same way: more of the drug in the blood. For drugs with a narrow safe range, where a little more can cause side effects, that matters.

How much piperine do studies use?

These are amounts studies used or authorities set, not a dose for you. There is no NIH upper limit for piperine. Two regulators have set caps on isolated piperine in health products, both because of drug interactions ¹.

One LifeFrom Piperine capsule holds 40 mg. That is about twice the 20 mg used in most human studies, eight times the 5 mg in the CoQ10 study, and above both the Canadian 14 mg cap and the Australian 10 mg recommendation for isolated piperine ¹. It sits inside the estimated range of piperine from pepper in a US diet, but the BfR points out that food pepper delivers piperine spread through meals and within the whole peppercorn, which may change how it acts ¹. Nobody has tested whether 40 mg raises curcumin or medicines more than 20 mg does.

When and how to take piperine

How long does piperine take to work? Its effect on absorption appears within the hour ². In the CoQ10 study, a difference was clear only after 21 days ⁸. What is piperine's half-life? We did not find a reliable human figure; the BfR review cites peak blood levels 1 to 3 hours after a single 50 mg dose in two people, too few for a clean number ¹. Because some drug studies gave piperine for 6 or 7 days before the medicine, spacing piperine a few hours away from a medicine may not prevent an interaction; no study has tested that ³⁶.

Pepper in food vs a piperine capsule

Piperine side effects

For scale, a 40 mg capsule is about 0.6 mg per kg of body weight for a 70 kg (154 lb) adult. That is below the 1 mg per kg level at which the rat fertility studies found no effect, but the BfR says human data are too limited for a proper safety assessment ¹.

Is piperine bad for your liver?

We found no good human evidence that piperine alone injures the liver. The concern is the company it keeps. NIH warns that curcumin formulations that enhance absorption may harm the liver ¹¹. In a US case series of 10 people with turmeric-linked liver injury, 3 of the 7 products tested also contained piperine, and the authors suggested that rising use of black pepper combinations may be one reason such cases are increasing ¹⁰. Liver injury typically appeared 1 to 4 months after starting ¹⁰¹⁵. Dark urine, yellow skin or eyes, or pain under the right ribs means stopping the supplements and getting same-day care. The turmeric guide covers this in detail, and our liver enzymes guide explains ALT and AST.

Who should avoid piperine or ask first

• Anyone on a regular medicine, especially seizure, heart, asthma, HIV or transplant medicines: ask a pharmacist first ¹.
• Pregnancy: animal studies found harm to the mother and embryo at high bolus doses, the BfR concluded it seems advisable for pregnant women to abstain from supplements containing isolated piperine, and Health Canada requires a label telling pregnant women to consult a practitioner ¹. Pepper in food is a different matter.
• Breastfeeding: no safety data at supplement amounts; Health Canada's label advice applies here too ¹.
• Trying to conceive: rat studies found disturbed sperm production at high doses, and mouse studies found lower fertility and fewer implantations in females; the BfR flags both as relevant to people trying to conceive, and human data are lacking ¹.
• Children: no studies of piperine supplements in children.
• Liver disease, or taking turmeric with piperine: know the red flags above ¹⁰.
• Bleeding disorders, blood thinners, or surgery coming up: tell your care team, since piperine may change clotting and how anesthesia drugs are handled ¹⁴.

Supplements to pair or keep apart

Blood tests worth knowing about

No routine blood test measures piperine. What changes is the level of other things, so the useful checks are the ones tied to your medicines and to liver safety. Ask your clinician whether any of these make sense for you.

Conditions and goals piperine comes up around

Piperine usually shows up as a passenger: in turmeric products for joint comfort, and sometimes with CoQ10 for people on statins for high cholesterol. Those conditions are diagnosed and managed by a clinician, piperine is not a treatment for them, and it is never a reason to change a prescribed medicine. If you have fatty liver or another liver condition, the turmeric liver reports are a reason to ask before combining the two.

Piperine in the LifeFrom pouch

The 40 mg serving is higher than the 5 to 24 mg used in the human studies we found, and above Health Canada's 14 mg daily cap and Australia's 10 mg recommendation for isolated piperine ¹. Everything in a pouch is taken at once, so a piperine capsule acts on every other supplement in that pouch; added to a pouch that also holds the Turmeric capsule, the total is 45 mg of piperine. See the shop and its packs.

This guide is general education, not medical advice. Supplements are not approved by the FDA for safety or effectiveness before they are sold. Because piperine changes how other substances are handled, the clinician or pharmacist who knows your medicines is the right person to decide whether it makes sense for you; see our medical disclaimer.

Free in LifeFromAdd the lab results you already have, and LifeFrom reads each marker next to the others it moves with, in plain language, with the sources it used. Free, on the web or in the app.

Start on the web Download the app