Long pepper

Other Names

Bi BaBi BoCabe JawaChapalaChavica longa (L.) H.Karst.Chavica roxburghii Miq.Chavica sarmentosa Miq.common long pepperDarfilfilDipliFilfil DarazFilfildaraazGanthodaGantodaGranthikaHipliHippaliHippaliballiIndian long pepperIndonesian long pepperJaborandi pepperJavanese long pepperKanaKanaaKattuthippaliKolaKrushnaLada PanjangLange peperLanger PfefferLangpepparMagadhaMagadhiMagadhikaMagadhodbhavaModiPeikchinPepe lungaPepe lungoPeperi makronPieprz dlugiPimenta longaPimienta largaPimpliPipalPipalaPipaliPipalimulaPiparPipariPiper latifolium HunterPiper longumPiper longum L.Piper roxburghii (Miq.) J.PreslPiper sarmentosum Wall.Piper turbinatum NoronhaPiplamorPiplamulPipliPippaliPippalikaPippalluPippliPipulPitkä pippuriPoivre longPoivre long d'IndePoivrier longShoundiTeeksna TandulaThippiliTippaliTippiliUpakulyaUshanaVaidehi

Synopsis

Long Pepper (Piper longum L.): A Comprehensive Reference

1. Identity and Botanical Description

Taxonomy and Nomenclature

Piper longum L., sometimes called Indian long pepper or pippali, is a flowering vine in the family Piperaceae, cultivated for its fruit, which is usually dried and used as a spice and seasoning. It grows as a perennial shrub or as an herbaceous vine and is commonly known as "long pepper" or "Pippali." The plant is therapeutically used in many traditional systems of medicine, including Unani, Ayurveda, and Siddha. In the Unani tradition it is known as Filfil Darāz, and in Tamil as Thippili.

Morphology and Distribution

The plant is a dioecious, slender, aromatic climber with perennial woody roots occurring in the hotter parts of India. Leaves are numerous, wide ovate, and cordate. The inflorescence is a cylindrical, pedunculate spike; male flowers are larger and more slender than female flowers. Female flowers are up to 2.5 cm long and 4–5 mm wide. Fruits are long, shiny blackish-green spike-like bodies.

The plant is native to the Indo-Malaya region and is widely distributed in the tropical and subtropical world, including the Indian subcontinent, Sri Lanka, the Middle East, and the Americas. It is indigenous to South India and the Western Ghats of India, and is cultivated in the hotter parts of India, mainly Orissa, Kerala, and the central to northeastern Himalayas.

Long pepper has a taste similar to, but sweeter and more pungent than, its close relative Piper nigrum. The fruit consists of many minuscule fruits — each about the size of a poppy seed — embedded in the surface of a flower spike that closely resembles a hazel tree catkin. Like Piper nigrum, the fruits contain the compound piperine, which contributes to their pungency. Another species of long pepper, Piper retrofractum, is native to Java, Indonesia.

Plant Parts Used and Common Preparations

The entire plant, including the stem, roots, leaves, and fruits, is reported to be used in the treatment of numerous ailments. Pippali refers specifically to the fruit, while Pippali Mula refers to the root. Both are used in Ayurvedic medicine but have slightly different properties and applications. The root is commonly used for respiratory and digestive conditions and is sometimes preferred in specific formulations.

Common commercial preparations include:

Dried whole fruit spikes (catkins), used as a culinary spice and in decoctions
Powdered fruit (churna), the most classical Ayurvedic dosage form
Standardised dry extracts, often standardised to piperine content
Essential oil, extracted from both fruit and root
Compound Ayurvedic formulations such as Trikatu, Chyawanprash, and Sitopaladi Churna
Pippali Rasayana, a classical rejuvenating formulation

The fruits are mostly used as a culinary spice and preservative, and are also a potent remedy in various traditional medicinal systems.

2. Historical and Traditional Use

Ancient India: Ayurveda, Unani, and Siddha

The importance of P. longum in the Indian traditional medicinal system has been described in ancient texts such as the Charaka Samhita, Susruta Samhita, and Vagbhata's Astangya Hrdayam. The earliest Ayurvedic mention appears in the Charaka Samhita (circa 100 BCE), where it is celebrated under the name "Pippalimula" for balancing Vata and Kapha. Later, the Sushruta Samhita (circa 500 CE) describes Pippali's use in respiratory therapies — often combined with honey and ghee to soothe chronic coughs.

In prehistoric traditional Indian medicine such as Ayurveda, both types of pepper found their usage. They were mainly used for the purpose of controlling diabetes, as an inducer of the central nervous system (CNS), as digestive tonics, antispasmodics, aphrodisiacs, blood purifiers, and antipyretics. Since early times, pepper has also been included in various customary formulas for the purpose of boosting the efficacy of other active secondary molecules such as curcumin and vasicine.

P. longum forms an active constituent of the widely used Ayurvedic poly-herbal formulation Trikatu. It is also a key ingredient in Chyawanprash, Sitopaladi Churna, and countless classical remedies.

Ancient Greece and Rome

P. longum was first written about by Hippocrates, who described it as a medicament rather than a spice. Long pepper reached Greece in the 6th or 5th century BCE, and was an important and well-known spice before the European discovery of the New World. The history of black pepper is linked to — and often confused with — that of long pepper, although Theophrastus distinguished the two in the first work of botany.

Two species of pepper were domesticated: long pepper (Piper longum) in the northeast of India and black pepper (Piper nigrum) in the southwest. Long pepper was the most popular pepper in Rome because of its greater pungency, while black pepper dominated in medieval Europe because it was more readily available to traders. By Roman times it had become a prominent spice used for cooking and cost twice as much as black pepper, though the two were often confused.

Medieval Europe and the Spice Trade

Long pepper remained popular in Europe long after the fall of Rome, right up until the sixteenth century. Black pepper, on the other hand, would not become fashionable until the twelfth century. During the Middle Ages, tenants were known to have paid their landlords with long pepper. The famed fourteenth-century chef of the French court, Guillaume Tirel, listed it among the basic spices in his store cupboard. Long pepper was a relatively common ingredient in medieval drinks, including mead and ale. It also appeared in various spiced wines, including the widely popular hippocras, a wine infused with spices and believed to have health-giving properties.

During the 1400s and 1500s, long pepper lost its place as the go-to heat-giving spice of European pantries. Trade routes by sea had outcompeted overland trade routes, and since black pepper traveled by water, it won out over long pepper.

Traditional Medicinal Uses Across Systems

It is most commonly used to treat chronic bronchitis, asthma, constipation, gonorrhea, paralysis of the tongue, diarrhea, cholera, chronic malaria, viral hepatitis, respiratory infections, stomachache, bronchitis, diseases of the spleen, cough, and tumors. P. longum is a component of Indian traditional medicine, reported to be used as a remedy for treating gonorrhea, menstrual pain, tuberculosis, sleeping problems, respiratory tract infections, chronic gut-related pain, and arthritis. The Unani tradition specifically employed it as a warming carminative and as a treatment for phlegmatic conditions of the respiratory and digestive tracts.

3. Phytochemistry: Key Constituents and Active Compounds

Alkaloids (Primary Bioactives)

The fruit contains a large number of alkaloids and related compounds, the most abundant of which is piperine, followed by methyl piperine, pipernonaline, piperettine, asarinine, pellitorine, piperundecalidine, piperlongumine, piperlonguminine, retrofractamide A, pergumidiene, brachystamide-B, a dimer of desmethoxypiplartine, N-isobutyl decadienamide, brachyamide-A, brachystine, pipercide, piperderidine, longamide, dehydropipernonaline piperidine, and tetrahydropiperine.

Among all the phytochemicals, piperine is the chief alkaloid, constituting approximately 3–5% on a dry weight basis. Piperine, piperlongumine, tetrahydropiperlongumine, trimethoxy cinnamoyl-piperidine, and piperlonguminine have been found in the root.

Volatile Oil and Other Constituents

Studies on the chemical composition of long pepper showed that it contains about 1% volatile oil, 1.25% piperine, and 40% starch. As compared to black pepper, long pepper is poorer in essential oil and piperine, and the volatile oil is dextrorotatory, while that of black pepper is levorotatory. GC-MS analysis of the essential oil showed the presence of 48 components, of which 44 were identified for the first time. The three major components of the oil were β-caryophyllene (17%), pentadecane (17.8%), and p-bisabolene (11.16%).

From the fruits, two long-chain esters — tridecyldihydro-p-coumarate and eicosanyl-(E)-p-coumarate — and three alkamides (piperine, piperlonguminine, and pellitorine) have been isolated. Various bioactive phytochemicals including alkaloids, flavonoids, esters, and steroids have been identified from plant extracts.

Piperine: Structure and Identification

Piperine (IUPAC name: (2E,4E)-5-(2H-1,3-benzodioxol-5-yl)-1-(piperidin-1-yl)penta-2,4-dien-1-one; CAS No. 94-62-2; molecular formula: C₁₇H₁₉NO₃; molecular weight: 285.34 g/mol) is a natural ingredient of Piper nigrum, Piper longum, and some other Piper species.

4. Established Mechanisms of Action

Bioavailability Enhancement

Piperine, a major active component of black and long peppers, has been reported to enhance drug bioavailability. Studies were aimed at understanding the interaction of piperine with enzymatic drug biotransforming reactions in hepatic tissue in vitro and in vivo. Piperine inhibited arylhydrocarbon hydroxylation, ethylmorphine-N-demethylation, 7-ethoxycoumarin-O-deethylation, and 3-hydroxy-benzo(a)pyrene glucuronidation in rat postmitochondrial supernatant in a dose-dependent manner.

Studies demonstrated that piperine is a nonspecific inhibitor of drug metabolism which shows little discrimination between different cytochrome P-450 forms.

Two plausible mechanisms for piperine's role in drug bioavailability have been proposed: (a) non-specific mechanisms promoting rapid absorption, including increased blood supply to the gastrointestinal tract, decreased hydrochloric acid secretion which prevents breakdown of some drugs, increased emulsifying content of the gut, and increased enzymes like gamma-glutamyl transpeptidase which participate in active and passive transport of nutrients to intestinal cells; and (b) non-specific mechanisms inhibiting enzymes participating in biotransformation of drugs, preventing their inactivation and elimination.

Additionally, piperine modulates intestinal permeability and alters the pharmacokinetics of drugs by interfering with first-pass metabolism. Studies provide evidence that piperine enhances the bioavailability of many compounds; the serum response of β-carotene is increased by 60% when supplemented with piperine through the oral route. Piperine also increased the bioavailability of silybin by 146–181%.

Anti-inflammatory Mechanisms

Many of P. longum's pharmacological properties have been attributed to its antioxidative and anti-inflammatory effects and its ability to modulate a number of signalling pathways and enzymes. Piperlongumine, the second major alkaloid, has been shown in animal models to suppress production of pro-inflammatory cytokines including IL-1β, IL-6, IL-17A, and TNF-α.

Anticancer Mechanisms (Piperlongumine)

Piperlongumine (PL) is a naturally occurring small molecule derived from long pepper; it is selectively toxic to cancer cells by generating reactive oxygen species (ROS). The anticancer activities occur through the p38/JNK, MAPK, and NF-κB pathways and by the induction of high levels of ROS. PL also causes cell death through both caspase-dependent apoptosis and necrosis, and induces the downregulation of Bcl-2 expression and the activation of caspase-3, PARP, and JNK.

Piperlongumine may interact with thioredoxin reductase 1 (TrxR1), an important selenocysteine-containing antioxidant enzyme, and induce ROS-mediated apoptosis in hepatocellular carcinoma (HCC) cells. The results suggest that PL induces a lethal endoplasmic reticulum (ER) stress response in HCC cells by targeting TrxR1 and increasing intracellular ROS levels.

Antidiabetic Mechanisms

The antidiabetic and antihyperlipidemic potential of oil from Piper longum (PLO) and piperine involves possible mechanisms including α-glucosidase, aldose reductase (AR), and pancreatic lipase inhibitory activity.

5. Scientific Evidence by Area of Use

5.1 Respiratory Health: Asthma and Bronchitis

In view of the therapeutic use of Piper longum in bronchial asthma by Ayurvedic physicians, studies have been carried out on the mechanism of its anti-allergic effects, as milk extract effectively reduced passive cutaneous anaphylaxis in rats and protected guinea pigs against antigen-induced bronchospasm.

A clinical study in pediatric asthma patients represents one of the few controlled human investigations. P. longum (Pimpli) was advocated for prophylactic treatment of asthma in Indian traditional medicine. It was highly effective in decreasing frequency and severity of attacks in childhood asthma. Experimental work indicated antiallergic efficacy of P. longum. The study was carried out in 20 pediatric patients suffering from asthma. Sensitivity test to house dust mite (HDM) extract was carried out and children positive to this test were included. The severity of asthma was graded and pulmonary functions were assessed wherever possible. Serum IgE levels were estimated. P. longum was administered over a period of 5 weeks; the total dose for a child under 5 years was 9.35 g and for a child over 5 years was 15.75 g. Sensitivity testing, serum IgE, and pulmonary functions all showed significant improvement after treatment with Piper longum.

In a mouse model, piperlongumine was assessed for anti-asthmatic activity at the molecular level. The results revealed that PL pretreatment reduced ovalbumin-induced airway inflammatory cell infiltration, reduced Th2 cytokine expression both in the bronchoalveolar lavage fluid and in lung tissues, reduced serum IgE level, pro-inflammatory cytokines (TNF-α and IL-6), and intercellular adhesion molecule expression, as well as NF-κB activation. In addition, PL also mitigated goblet cell metaplasia, inhibited mucus protein secretion, mitigated airway fibrosis, and downregulated fibrosis marker expression.

Evidence strength: Preliminary to moderate. Experimental and limited clinical evidence supports efficacy in attenuating airway inflammation, bronchospasm, oxidative stress, and allergic responses. Further well-designed clinical trials employing standardized formulations are warranted to establish efficacy.

5.2 Bioavailability Enhancement

The effects of piperine on the bioavailability and pharmacokinetics of propranolol and theophylline were studied. Six subjects in each group received a single oral dose of propranolol (40 mg) or theophylline (150 mg) alone or in combination with piperine (20 mg) daily for 7 days. An earlier Tmax and a higher Cmax and AUC were observed in subjects who received piperine and propranolol. It produced a higher Cmax, longer t½, and a higher AUC with theophylline. The enhanced systemic availability of oral propranolol and theophylline could be exploited to achieve better therapeutic control and improved patient compliance.

The effect of piperine on oral bioavailability of phenytoin was studied in human volunteers. The objective was to explore the effect of a single dose of piperine in patients with uncontrolled epilepsy on the steady-state pharmacokinetics of phenytoin. Two groups of 10 patients each receiving either 150 mg or 200 mg twice daily of phenytoin were selected. Blood samples were collected at 0, 0.5, 1, 2, 4, 6, 9, and 12 h after administration. On the following study day, piperine 20 mg was administered along with phenytoin and samples collected similarly. There was a significant increase in AUC0–12h (P < 0.01), Cmax (P < 0.001), and Ka (P < 0.05), whereas changes in Kel and Tmax were not significant. The results showed that piperine enhanced the bioavailability of phenytoin significantly, possibly by increasing absorption.

In another study, 12 healthy subjects took a single 120-mg dose of fexofenadine before and after administration of piperine 20 mg/day for 10 days. With piperine pretreatment, fexofenadine AUC increased by 68%, but the fexofenadine half-life was not significantly affected. The authors propose that piperine inhibits P-glycoprotein (PGP), thus increasing fexofenadine bioavailability.

Piper longum extract at 2.5 and 10 mg/kg increased the bioavailability of boswellic acid (p < 0.05). Based on drug-based computational modeling, a CYP450-mediated mechanism was involved in the increased bioavailability. These findings confirmed that Piper longum with boswellic acid may be administered orally together for effective therapeutic efficacy.

Evidence strength: Moderate, with multiple small human pharmacokinetic studies demonstrating consistent drug-interaction signals; however, most studies are small and non-blinded, and comprehensive randomized controlled trials are lacking.

5.3 Anticancer Activity

Studies demonstrate that piperlongumine inhibits cell proliferation, regulates the cell cycle, and induces cellular apoptosis in various types of human thyroid cancer cells. Reactive oxygen species (ROS) are believed to hold promise as a new therapeutic strategy for multiple human cancers.

Piperlongumine, described as an anticancer alkaloid from long pepper plants, was investigated in primary myeloid leukemia cells from patients. Human bone marrow samples were obtained from 9 patients with acute or chronic myeloid leukemias and 2 patients with myelodysplastic syndrome (MDS). PL inhibited the viability of bone marrow mononuclear cells from patients with myeloid leukemias (with IC50 less than 20 μmol/L), but not those from a patient with MDS. Furthermore, PL (10 and 20 μmol/L) induced apoptosis of bone marrow cells from patients with myeloid leukemias in a dose-dependent manner.

Piperlongumine (PL), a natural alkaloid from Piper longum, possesses highly selective and effective anticancer properties. PL selectively inhibited cell growth of human ovarian cancer cells. PL notably induced cell apoptosis, G2/M phase arrest, and accumulation of intracellular ROS in a dose- and time-dependent manner. Pretreatment with antioxidant N-acetyl-L-cysteine could totally reverse PL-induced ROS accumulation and cell apoptosis.

PL has shown antitumor activity in several whole-animal models, and it is reported to be highly safe when used in vivo.

Evidence strength: Preclinical only (in vitro and animal models). The study involving primary leukemia cells from patients represents an ex vivo analysis, not a clinical trial. No completed randomized human clinical trials evaluating piperlongumine or long pepper extracts as anticancer agents in humans have been identified in these sources. The body of preclinical evidence is substantial and growing, but translation to the clinic remains unproven.

5.4 Antidiabetic and Antihyperlipidemic Effects

Piper longum oil (PLO) at 100 and 200 mg/kg, piperine at 25 and 50 mg/kg, and glibenclamide (0.6 mg/kg) in respective groups of diabetic animals administered for 28 days reduced blood glucose levels in streptozotocin-induced diabetic rats. There was a significant increase in body weight, liver glycogen content, plasma insulin, and high-density lipoprotein, and a decrease in glycosylated hemoglobin, triglyceride, and total plasma cholesterol in PLO-administered groups compared to controls.

A bioassay-guided isolation of an ethanol extract of the fruit of Piper longum yielded piperlonguminine, piperine, and pipernonaline as the main antihyperlipidemic constituents. They exhibited appreciable antihyperlipidemic activity in vivo, which was comparable to that of the commercial antihyperlipidemic drug simvastatin.

Evidence strength: Animal (preclinical) only. No human clinical trials specifically evaluating long pepper for diabetes or dyslipidemia management have been identified in the available literature. All metabolic data are from animal models.

5.5 Hepatoprotective Effects

Co-administration of aqueous extracts or piperine with antitubercular drugs prevented oxidative stress-induced hepatocellular injury by restoring glutathione levels and reducing lipid peroxidation. Moreover, extracts of P. longum demonstrated protective effects in aluminium chloride-induced hepatotoxicity, restoring liver enzymes and attenuating biochemical liver damage. The root aqueous extract showed hepatoprotective, antihyperglycemic, and antihyperlipidemic effects in streptozotocin-induced diabetic rats.

Treatment with the ethanol extract of P. longum inhibits liver fibrosis induced by carbon tetrachloride (CCl4). Piperine exerted significant protection against tert-butyl hydroperoxide and carbon tetrachloride hepatotoxicity by reducing both in vitro and in vivo lipid peroxidation, enzymatic leakage of GPT and AP, and by preventing cellular damage.

Evidence strength: Animal and in vitro only. No human trials assessing hepatoprotective outcomes with long pepper have been identified.

5.6 Immunomodulatory Activity

A popular formulation used in Ayurveda known as Pippali rasayana, comprising long peppers, was examined in Giardia lamblia-infected mice and was found to stimulate macrophages, showing an increase in the values of accelerated macrophage migration index and phagocytic index in infected animals, hinting at the immune-stimulatory activity of the formulation.

Evidence strength: Animal and in vitro only, with one small clinical study on Giardia management (referenced under digestive use below).

5.7 Antiparasitic Activity: Giardiasis

The Pippali Rasayana formulation was the subject of at least one published clinical study. Management of giardiasis by an immunomodulatory herbal drug Pippali rasayana was reported in the Journal of Ethnopharmacology in 1994, and a follow-up clinical study on management of giardiasis by the same herbal drug was reported in J Ethnopharmacol in 1997.

Evidence strength: Limited. These clinical reports represent small, open-label studies. Independently replicated rigorous clinical trials have not been identified.

6. Body Systems and Health Areas

Based on the available scientific and traditional literature, P. longum is primarily associated with the following body systems:

Respiratory system: The fruits are a potent remedy in various traditional medicinal systems against bronchitis, cough, cold, and related conditions.
Digestive system: Piperine, an alkaloid of long peppers, inhibited gastric emptying of solids/liquids in rats and gastrointestinal transit in mice in a dose- and time-dependent manner.
Metabolic/endocrine system: Preclinical evidence for antidiabetic and antihyperlipidemic activity, as described above.
Hepatic system: Preclinical evidence for hepatoprotective and antifibrotic effects.
Immune system: Macrophage stimulation and phagocytic index enhancement demonstrated in animal models.
Oncological (investigational): Preclinical ROS-mediated cytotoxicity of piperlongumine across multiple cancer cell types.
Pharmacokinetic enhancement: Human pharmacokinetic studies documenting piperine's ability to increase bioavailability of co-administered drugs.

7. Dosage Forms and Reported Dosages

The following dosages are reported in source materials only and are not personal recommendations:

In the childhood asthma clinical study, P. longum was administered over 5 weeks; the total dose for a child under 5 years was 9.35 g and for a child over 5 years was 15.75 g.
In human pharmacokinetic studies, six subjects in each group received a single oral dose of propranolol (40 mg) or theophylline (150 mg) alone or in combination with piperine (20 mg) daily for 7 days.
In the fexofenadine study, 12 healthy subjects received piperine 20 mg/day for 10 days prior to a single 120-mg dose of fexofenadine.
In diabetic rat studies, Piper longum oil was administered at 100 and 200 mg/kg, and piperine at 25 and 50 mg/kg for 28 days.
Piper longum extract at 2.5 and 10 mg/kg was used in the boswellic acid bioavailability rat study.
In human interaction studies, drug interactions (increased bioavailability) were observed with several drugs at bolus doses of 20 mg piperine per day. For midazolam, increased clinical efficacy was reported with bolus administration of 15 mg piperine per day.
The prior art studies indicate that a dose of approximately 10% (wt/wt) of the active drug could be regarded as an appropriate bioenhancing dose for most drug compounds.

The classical Ayurvedic text-based dosage for pippali churna (fruit powder) is generally cited as small quantities (often in the range of 0.5–1 g), typically taken with honey or ghee, though specific clinical trial validation of these exact doses is limited.

8. Safety Considerations and Drug Interactions

General Safety Profile

In human and animal studies with single or short-term bolus application of isolated piperine, interactions with several drugs — in most cases resulting in increased drug bioavailability — were observed. Depending on the drug and extent of the interaction, such interactions may carry the risk of unintended and deleteriously increased or adverse drug effects.

Animal studies with higher daily piperine bolus doses than in human interaction studies provide indications of disturbance of spermatogenesis and of maternal reproductive and embryotoxic effects. Although the available human studies rarely reported effects that were regarded as being adverse, their suitability for detailed risk assessment is limited due to an insufficient focus on safety parameters apart from drug interactions.

Based on a 90-day toxicity study in rats, a no observed adverse effect level (NOAEL) of 5 mg/kg bw per day was set in 2015 by the European Food Safety Authority (EFSA).

Provided that the ingestion of piperine via pepper (food flavouring) or intake of dietary supplements containing P. nigrum or P. longum does not exceed common dietary levels, the risk of adverse piperine-drug and piperine-phytochemical interactions is minimal.

Drug Interactions (Human Evidence)

In humans, piperine inhibits P-glycoprotein and CYP3A4 enzymes and also inhibits or induces CYP1A1, CYP1B1, CYP1B2, CYP2E1, and other metabolising enzymes. Thus, a diet containing piperine may influence the plasma levels of P-glycoprotein and CYP3A4 substrates in humans, especially if the drugs are administered orally.

Previous evidence from in vitro and animal studies does suggest that piperine inhibits P-glycoprotein, but more clinical evidence is needed to determine if piperine interacts with other P-glycoprotein substrates with a greater risk of toxicity, such as digoxin. The possibility of PGP inhibition by piperine also raises the issue of piperine simultaneously inhibiting PGP and CYP3A4.

Pure piperine, despite multiple biological actions, has poor water solubility and low bioavailability; thus, modified drug-delivery systems are utilized to deliver piperine in appropriate amounts.

Despite its promising bioenhancing effects, piperine exhibits limitations such as poor water solubility, dose-dependent toxicity, reproductive and hepatic concerns, and the potential for significant drug-drug interactions.

Reproductive Toxicology

Animal studies with higher daily piperine bolus doses than in human interaction studies provide indications of disturbance of spermatogenesis and of maternal reproductive and embryotoxic effects. These findings have not been confirmed in human studies, but they are considered relevant to risk assessment for high-dose supplementation.

Overall Evidence Gaps

Although there are numerous indications for P. longum's use, controlled trials are needed to determine its efficacy. There is no comprehensive evidence on the cytochrome P450-mediated effect of piperine on pharmacokinetic alterations in co-administered conventional drugs. The existing human pharmacokinetic interaction studies are predominantly small, often non-blinded, and non-randomized. The anticancer and metabolic effects documented in preclinical models require robust human clinical validation before clinical conclusions can be drawn.

References

Health Conditions

Health conditions that Long pepper may help support.

No conditions available.

Body Systems

Body systems that Long pepper may help support.

No body systems available.