Javanese long pepper

Other Names

Amalago antillana Raf.Amalago malamiri Raf.Balinese long pepperBalinese pepperBalliCabai jawaCabe jamuCabe jawaCabiaCavikaCavyaChabChabaChabachiniChabakChabhaChabyaChaikaniChainkathChavakaChavakamChaviChavica arnottiana Miq.Chavica chaba Miq.Chavica exasperata (Vahl) Miq.Chavica labillardierei Miq.Chavica maritima Miq.Chavica officinarum Miq.Chavica parvifolia (Blanco) Hassk.Chavica peepuloides WightChavica retrofracta (Vahl) Miq.ChavikaChavika mulaChavkaChavyaChavyamChavyamuChayiChearCheiChepaanChevuyamChevyamuChoiChoyiCubeba chaba (W.Hunter) Miq.Dee PleeDei-phleiDipliDipli-chueakGaja PippaliGajapippaliHasti pippaliJaborandi pepperJava long pepperJava long pepper rootJava pepperJavaanse lange peperJavanese pepperJia bi baKababahKadumenasinaballiKamkalaKattumulakuKattumulakunveruKoloskovyy peretsLada panjangLitlitLong pepperPeepal ChabPiper arnottianum (Miq.) C.DC.Piper callosum OpizPiper chaba W.HunterPiper chuvya W.HunterPiper chuvya W.Hunter ex C.DC.Piper exasperatum VahlPiper hapnium Buch.-Ham. ex Hook.fil.Piper longum Blume (non L.)Piper maritimum (Miq.) BlumePiper maritimum (Miq.) Blume ex C.DC.Piper officinarum (Miq.) C.DC.Piper retrofractum VahlPoivre long de JavaSevamuShreyasiYavansky perets

Synopsis

Javanese Long Pepper (Piper retrofractum Vahl.)

1. Identity: Botanical Classification, Names, and Forms

Taxonomy and Nomenclature

Piper retrofractum Vahl. — also known as Balinese long pepper or Javanese long pepper — is a flowering vine in the family Piperaceae, cultivated for its fruit, which is usually dried and used as a spice and seasoning. This species is native to Java island in Indonesia. Synonyms recorded in the botanical literature include Chavica officinarum Miq. and Piper officinarum (Miq.) C.DC.

Piper retrofractum Vahl is a dioecious, evergreen climbing shrub in the family Piperaceae, native to Southeast Asia, including the Philippines, Indonesia, Malaysia, Thailand, Vietnam, Cambodia, Laos, and southern China. It should not be conflated with Piper longum L. (Indian long pepper), with which it shares morphological similarities and is frequently confused. Another species of long pepper, P. retrofractum, is native to Java, Indonesia.

The plant is known by many vernacular names across its range. In Indonesia it is called cabe jawa or cabe jamu. In Cambodia, it is known as dei-phlei, and in Thailand as deebplee. In the Malay Archipelago, the fruit was once known as cabai; however, its culinary popularity was superseded by the chili, brought from the New World by European traders, resulting in a semantic shift in which the new crop became cabai and the old became cabai jawa.

Morphology

This liana grows up to 10 meters long, supported by adhesive roots, with glabrous, coriaceous leaves that are ovate to oblong, measuring 8–20 cm long and 3–13 cm wide, often featuring sunken gland dots. Its erect or patent spikes produce cylindrical infructescences 2–4 cm long, bearing connate berries that are green and pungent when unripe, turning red-brown upon maturity. The fruit of Java long pepper is a small drupe arranged in a flower spike forming a compact fruiting, welded, reminiscent of black catkins. This species is a more spicy pepper than Piper nigrum.

Common Forms and Preparations

The principal commercial part of the plant is the dried fruit spike, used whole or ground. P. retrofractum is used as a substitute spice for pepper (P. nigrum), and is also used as a traditional medicine for fever, hypotensia, abdominal pain, beri-beri, cholera, nonperspiration, and as an anthelmintic in Indonesia. In research settings, extracts are typically prepared using dichloromethane, methanol, ethanol, or water as solvents. The Indonesian government's health agency (Badan POM) has formally classified the plant as a fitofarmaka (standardized phytopharmaceutical), reflecting its status in the national traditional medicine framework.

2. Traditional and Historical Use

Indonesia and Javanese Jamu Tradition

Piper retrofractum, known locally as cabe jawa in Indonesia, has been documented in ancient Javanese inscriptions from the early tenth century as a valued spice alongside black and white pepper, highlighting its early integration into regional agriculture and trade. In traditional Indonesian contexts, it served dual roles as both a culinary spice and a medicinal herb, often incorporated into herbal preparations for digestive and respiratory ailments, reflecting its longstanding significance in pre-colonial societies.

The Indonesians named it "cabe jawa" or "cabe jamu." Empirically, it is used mainly as one of the important ingredients in traditional Indonesian drinks and is believed to give a warming sensation. Its elongated-shaped fruits are traditionally used for bronchitis, gastrointestinal ulcers, diarrhea, and postpartum hemorrhage. Within the jamu tradition, jamu gendong (JG) is a kind of traditional medicine in liquid or other form that is freshly prepared (not preserved) from plant material, and P. retrofractum fruit is one of its core ingredients.

Traditionally, the fruit and root of Piper retrofractum were employed to stimulate digestion, relieve coughs, and address respiratory ailments, leveraging its warming and expectorant qualities. In Javanese folk remedies, it was often prescribed as a tonic to invigorate the body, combat fatigue, and support reproductive health.

Thai Ethnobotanical Tradition

In Thai ethnobotanical traditions, Piper retrofractum, referred to as dipli or dipli-chueak, holds cultural importance as a "hot"-flavored plant used to enhance vitality through improved digestion and blood circulation, and as a component of trikatu formulations that balance bodily elements and promote overall well-being. These uses underscore its role in folk medicine for treating conditions like asthma, influenza, and hypertension. In Thailand, the plant is also a documented ingredient in polyherbal formulas used in traditional Thai medicine.

Cross-Regional Use

The fruits of Piper retrofractum Vahl. have been used for their anti-flatulent, expectorant, antitussive, antifungal, and appetizing properties in traditional medicine, and they are reported to possess gastroprotective and cholesterol-lowering properties. The root was used in some traditions for toothache and convulsions, and the leaf was applied as a mouthwash. The plant's traditional use as an aphrodisiac — recorded in various Indonesian, Thai, and Indian sources — is among its most documented ethnopharmacological roles.

3. Key Phytochemical Constituents

Primary Classes of Compounds

The main chemical constituents that have been isolated and identified from P. retrofractum are amides, alkaloids, phenylpropanoids, alkyl glycosides, and lignans. Spices from the family Piperaceae are rich in bioactive compounds, such as piperamides, lignans, flavonoids, and essential oils.

Piperine and Related Piperidine Alkaloids

Piperine, a pungent principle, is the major component of this plant. The best-known active compound in Javanese long pepper is piperine, the alkaloid that gives many pepper species their pungent bite. Piperine is linked to several of the herb's most discussed properties: warming digestive action, antioxidant activity, inflammation-modulating effects, and the ability to alter how certain nutrients and drugs are absorbed.

Beyond piperine, several additional piperidine alkaloids have been isolated from the fruit. Two new piperidine alkaloids, piperoctadecalidine and pipereicosalidine, have been isolated from the fruits of Piper retrofractum (Piperaceae) along with the known piperidine alkaloids piperine and pipernonaline. A 2011 study specifically identified piperidine alkaloids from P. retrofractum Vahl. (PRPAs), including piperine, pipernonaline, and dehydropipernonaline, as the anti-obesity constituents through a peroxisome proliferator-activated receptor δ (PPARδ) transactivation assay.

Species-Specific Amides: The Retrofractamide Series

The plant contains a series of unsaturated amides unique to or characteristic of P. retrofractum. Two unsaturated amides, retrofractamides A and C, were isolated from the total above-ground parts of Piper retrofractum. Retrofractamide A was shown to be N-isobutyl-9(3′,4′-methylenedioxyphenyl)2E,4E,8E-nonatrienamide from spectroscopic and chemical investigations. The structure of retrofractamide C was confirmed by a total stereoselective synthesis. The presence of sesamin and 3,4,5-trimethoxydihydrocinnamic acid, as well as two higher homologues of retrofractamide A — pipericide (retrofractamide B) and retrofractamide D — was demonstrated.

Piper retrofractum Vahl. yielded retrofractamide-D, which has been fully characterised. Other constituents reported include mainly amides with a methylenedioxyphenyl group, such as pipercide, guineensine, and piperlonguminine.

Novel Amides and Phenylpropanoid Glucosides

A 2019 phytochemical investigation published in Natural Products and Bioprospecting (PubMed) found that two new amides — (E)-N-cinnamoyl-2-methoxypiperidine and (R)-1-(2-oxopyrrolidin-3-yl)-5,6-dihydropyridin-2(1H)-one — four new amide glucosides (retrofractosides A–D), and two new phenylpropanoid glucosides (retrofractosides E and F) were isolated from the fruits, together with 24 known compounds.

Lignans and Phenylpropanoids

The lignan sesamin has been confirmed as a constituent of the plant. Piperolactam C and piperlongumine were solely found in P. retrofractum, and the study also revealed the total antioxidant potency of the fruit. The phenylpropanoid 3,4,5-trimethoxydihydrocinnamic acid has also been characterised in the above-ground parts.

Essential Oil

An extract with pulsed electric field (PEF) pre-treatment yielded a thick dark-brown extract with characteristic odor and spicy taste, with an essential oil content of 3.00 ± 0.00% and a piperine content of 40.38 ± 2.44%.

4. Established Mechanisms of Action

Inhibition of NF-κB and Proinflammatory Signaling

Piper retrofractum (Javanese chili) extract demonstrated promising inhibitory effects on NF-κB and proinflammatory molecules. The results revealed that the extract significantly reduced LPS, NO, COX-2, IL-6, IL-1, and NF-κB through the TLR4 axis. Notably, Piper retrofractum extract was found to enhance the survival of human keratinocytes by protecting them from cell death induced by TRAIL, a member of the TNF superfamily.

AMPK and PPARδ Activation

PRPA treatment activated AMP-activated protein kinase (AMPK) signaling and PPARδ protein and also regulated the expression of lipid metabolism-related proteins. This mechanism was further demonstrated in the context of photoaging: PRE treatment activated PPARδ and AMPK, consequently upregulating mitochondrial synthesis and reducing ROS production. Additionally, PRE inhibited MMPs expression via suppressing mitogen-activated protein kinase (MAPK) and activator protein-1 (AP-1).

Bioavailability Enhancement via CYP450 and P-gp Inhibition

Piperine is reported to inhibit enzymes (cytochrome P450, UDP-glucuronyltransferase) that catalyze the biotransformation of nutrients and drugs, thereby enhancing their bioavailability and in vivo efficacies. This mechanism is of clinical relevance and is detailed further in the safety section below.

Anticholinesterase Activity

The neuroprotective effect of P. retrofractum is closely related to its moderate anti-butyrylcholinesterase (BChE) effect, with values ranging from 0.60 mg galanthamine equivalents (GALAE)/g. The methanolic extract from fruits of P. retrofractum showed an IC50 value of 14.08 μg/mL against AChE inhibitor.

Lymphangiogenesis Promotion

Administration of Piper retrofractum extract (PRE) has been reported to alleviate edema, but the mechanism underlying this effect was unknown until a 2022 study (PubMed ID 35567300) demonstrated, in vitro and in vivo, that PRE and its constituent piperine promote lymphangiogenesis via AKT- and ERK-dependent mechanisms.

5. Scientific Evidence by Area of Use

5.1 Anti-Inflammatory and Skin Disorders

A 2023 study published in Biomedicine & Pharmacotherapy (PMC10559909) examined the anti-inflammatory potential of an ethanolic extract of P. retrofractum (PRE) in both cellular and animal models. The investigation used a variety of assays including reporter assay, viability test, ELISA, and Western blotting. The results revealed that the extract significantly reduced LPS, NO, COX-2, IL-6, IL-1, and NF-κB through the TLR4 axis. Immunohistochemistry analysis in an imiquimod-induced skin inflammation mice model showed downregulation of COX-2 and IL-1β expression upon treatment with the extract. The authors concluded that PRE possesses sufficient pharmacological activity as an anti-inflammatory and protective agent against skin disorders. Evidence strength: Preclinical only (in vitro and murine model). No human clinical trials in dermatology have been published to date.

5.2 Anti-Obesity and Metabolic Effects

A 2011 study published in Biochemical and Biophysical Research Communications (PubMed 21741367) investigated the anti-obesity properties of PRPAs in a high-fat diet (HFD)-induced obese mouse model. Piperidine alkaloids from P. retrofractum Vahl. (PRPAs), including piperine, pipernonaline, and dehydropipernonaline, were isolated as the anti-obesity constituents through a PPARδ transactivation assay. The molecular mechanism was investigated in 3T3-L1 adipocytes and L6 myocytes. PRPA treatment activated AMPK signaling and PPARδ protein and also regulated the expression of lipid metabolism-related proteins. A separate patent filing based on this research described activities including weight and body fat loss caused by UCP activation-induced thermogenesis, prophylaxis and therapy of diabetes by decreasing fasting glucose levels and blood insulin levels, and the increase of muscle mass and exercise performance by ACC inhibition and CPT-1 activation driven by AMPK activity. Evidence strength: Preclinical (animal and cell-based studies). No published human clinical trials for obesity endpoints.

5.3 Antiphotoaging / Skin Aging

A 2018 study published in Evidence-Based Complementary and Alternative Medicine (PMC5829337) examined the antiphotoaging effects of PRE. The current study investigated the antiphotoaging effect of standardized Piper retrofractum extract (PRE) on UVB-damaged human dermal fibroblasts and hairless mouse skin. PRE treatment activated PPARδ and AMPK, consequently upregulating mitochondrial synthesis and reducing ROS production. Additionally, PRE inhibited MMPs expression via suppressing MAPK and AP-1. Evidence strength: In vitro (human dermal fibroblasts) and murine model. No human clinical trials reported.

5.4 Antimicrobial Activity

A study published in the peer-reviewed literature (PMC7042530) tested fruit extracts of P. retrofractum against ten pathogenic microorganisms. Antimicrobial activities of crude bioactive metabolites extracted from fruits of P. retrofractum were investigated against 10 pathogenic organisms (bacteria and yeast) causing opportunistic infections in humans or animals, including Bacillus subtilis ATCC6633, Staphylococcus aureus ATCC25923, Enterococcus faecalis ATCC2921, Escherichia coli ATCC25922, Klebsiella pneumoniae TISTR1843, Pseudomonas aeruginosa ATCC741, Salmonella typhi (clinical isolate), Vibrio parahaemolyticus, and Candida albicans ATCC90020. The results of the disk diffusion test showed that methanol solvent extracts exhibited greater antibacterial activity than other solvents, with inhibition zones ranging from 0.5 to 8.0 mm. MIC determined by the colorimetric assay confirmed that methanol extracts showed consistent results with the disk diffusion method. Evidence strength: In vitro only. No human clinical trials for antimicrobial applications.

5.5 Mosquito Larvicidal Activity

A study published in the Journal of Vector Ecology (Chansang et al., 2005) conducted bioassays of aqueous extracts from P. retrofractum fruits against mosquito larvae. Aqueous extracts of nine medicinal plants were bioassayed against larvae of Culex quinquefasciatus and Aedes aegypti. Among these plants, long pepper, Piper retrofractum Vahl (Piperaceae), showed the highest level of activity against mosquito larvae. Evidence strength: Laboratory bioassay. Not a human clinical study.

5.6 Antileishmanial Activity

Extracts of P. retrofractum have demonstrated antileishmanial activity in in vitro studies. The methanol and acetone extracts showed more than 75% inhibition at a concentration of 20 µg/mL, with IC50 values of 7.5 and 3.5 µg/mL, respectively. Evidence strength: In vitro. No clinical data in humans.

5.7 Cytotoxic and Antiproliferative Activity

A study using an ethanolic extract combination of Zingiber officinale cv. Rubrum and Piper retrofractum found that the mixture showed cytotoxic activity against HeLa and T47D cells, with IC50 values of 33 and 53 µg/mL, respectively. The extract caused a cytotoxic effect through an apoptotic mechanism. Evidence strength: In vitro cell line studies only. No human clinical oncology data have been published for P. retrofractum alone.

5.8 Androgenic / Aphrodisiac Effects

Research by Moeloek et al. (2010) showed that cabe jamu extract at a dose of 100 mg/day can act as an androgenic phytopharmaceutical, increasing blood testosterone levels and libido in hypogonadal men, and was reported to be safe. This is among the few studies involving human participants for P. retrofractum specifically. Evidence strength: The human study reported is limited in scope; independent replication in larger, double-blind, randomized controlled trials has not been established.

5.9 Neuroprotective / Neurological

Piperaceae spices can show multiple pharmacological actions with antioxidant, anti-inflammatory, and neuroprotective effects. In preclinical research, a long pepper extract formulated into a solid lipid microparticle (SLM) cream was applied in a rat model of neuropathic pain. The LPE-SLM cream showed a potential effect on pain attenuation via a decrease of spinal astrocyte activation-related mechanism. The LPE in SLM preparation could provide an alternative therapeutic strategy for treating neuropathic pain. Evidence strength: Animal and in vitro studies. No human clinical trial data available.

5.10 Bioavailability Enhancement (Piperine-Mediated)

The most clinically documented activity associated with piperine — the principal alkaloid of P. retrofractum — is its bio-enhancer effect. The average piperine content in pepper is commonly assumed to be 6% by dry weight, and the daily consumption of pepper ranges from approximately 83 to 333 mg; consequently, doses of 5 to 20 mg of piperine are often administered daily in clinical trials. In human studies, piperine has demonstrated gastrointestinal stimulation, anti-asthmatic, antioxidant, anti-hyperlipidemic, anti-diabetic, and anti-inflammatory activities, and enhancement of food absorption.

Specific documented human clinical interactions include: administering 2 g of pure curcumin powder combined with 20 mg of pure piperine powder to 10 healthy male volunteers resulted in a 20-fold increase in the relative bioavailability of curcumin with piperine co-administration. In a clinical study involving 12 healthy volunteers, a single dose of 200 mg carbamazepine was orally administered, with or without 10 consecutive days of piperine intake at 20 mg/day. The AUC of carbamazepine was 233 and 158 µg/mL·h, respectively. This 47% enhancement in AUC was attributed to inhibition of CYP3A4 by piperine, as oral clearance of carbamazepine was significantly reduced by 38.9%.

In another study, 20 healthy subjects were given oral midazolam 10 mg with and without pretreatment with piperine 15 mg/day for 3 days in a placebo-controlled crossover study. Piperine prolonged midazolam half-life and increased the degree and duration of midazolam-induced sedation. Note: These human data are derived from studies of isolated piperine, not from whole P. retrofractum extract. Findings are applicable to the extent that piperine is the relevant active constituent in the whole plant.

6. Body Systems and Health Areas Associated with the Plant

Digestive system: Carminative, antiflatulent, stomachic, appetite stimulant, gastroprotective properties attributed in both traditional and preclinical sources.
Respiratory system: Expectorant, antitussive, and use in asthma and bronchitis documented in traditional contexts.
Metabolic/Endocrine system: Anti-obesity and lipid-modulating effects demonstrated in animal models via AMPK/PPARδ; possible antidiabetic effects in preclinical research.
Integumentary system (skin): Antiphotoaging activity in fibroblast and murine models; anti-inflammatory effects in psoriasis-like models.
Reproductive system: Aphrodisiac and androgenic properties, with limited human evidence from the Moeloek et al. 2010 study.
Nervous system: Anticholinesterase activity and preliminary neuropathic pain attenuation in animal models.
Immune system: Immunomodulatory effects attributed primarily to piperine; anti-infective properties observed in vitro.
Lymphatic system: Edema reduction and lymphangiogenesis promotion identified in preclinical research.

7. Dosage Forms and Reported Dosages

Dosage Forms

Piper retrofractum is commercially available and used in traditional preparations as:

Dried whole fruits (for decoctions and infusions in jamu preparations)
Ground powder (for oral use in teas, tonic drinks, and spice blends)
Standardized ethanolic or methanolic extracts (used in research and standardized phytopharmaceuticals)
Topical formulations (e.g., solid lipid microparticle creams investigated in preclinical neuropathic pain studies)

Dosages Reported in Published Studies

The following dosages appear in sourced studies and should be understood strictly within their respective research contexts:

Androgenic/aphrodisiac (human study, Moeloek et al. 2010): Cabe jamu extract at a dose of 100 mg/day was used in hypogonadal men.
Piperine for bioavailability enhancement (human clinical studies): Doses of 5 to 20 mg of piperine are often administered daily in clinical trials. In the carbamazepine interaction study, 20 mg/day was used for 10 consecutive days. In the midazolam interaction study, 15 mg/day was administered for 3 days.
Anti-obesity animal study (Kim et al. 2011): Piperidine alkaloids (PRPAs) were administered orally in HFD-induced obese mice; exact dosing in the mouse model was not fully captured in the accessible abstract text.
In vitro antimicrobial studies: Methanol extracts showed inhibition zones ranging from 0.5 to 8.0 mm at various concentrations in disk diffusion assays; MIC values were determined but are not directly translatable to human dosing.
Antileishmanial in vitro: The methanol and acetone extracts showed IC50 values of 7.5 and 3.5 µg/mL, respectively.

No universally accepted standardized human dosage range for Piper retrofractum fruit extract has been established by any regulatory body or pharmacopoeia. Comprehensive clinical trials in humans are limited.

8. Safety Considerations and Drug Interactions

General Safety Profile

The fruit of long pepper has a spicy taste similar to capsaicin, but it does not irritate or induce an allergic reaction in human skin. At traditional culinary doses, the plant appears to have a long history of safe use. The Moeloek et al. 2010 human study (100 mg/day extract) reported the preparation as safe. However, systematic toxicological profiling specific to P. retrofractum in humans remains limited, and most safety data derive from studies of its principal alkaloid, piperine, or from analogous Piper species.

Drug Interactions via CYP450 Inhibition

The most clinically significant safety concern associated with piperine-containing preparations is inhibition of drug-metabolizing enzymes. 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 deleteriously increased or adverse drug effects.

In cases involving administration of 20 mg of piperine/day, the increases in drug Cmax and AUC values were approximately 1.07- to 2.2-fold (Cmax) and 1.09- to 2.7-fold (AUC values), depending on the drug and drug dosage. Documented interactions include carbamazepine (AUC increased ~47%), midazolam (prolonged half-life and increased sedation), and fexofenadine. Taken together, these studies suggest that piperine inhibits CYP3A4 and may increase serum concentrations of CYP3A4 substrates.

In food supplements, piperine (primarily in the form of highly piperine-enriched pepper extracts, frequently with a piperine content in the range of ≥ 95%) is often used and promoted as a bio-enhancer to increase the bioavailability of other ingredients. The same mechanism that makes piperine potentially useful as a bioavailability enhancer also creates the risk of increasing plasma concentrations of co-administered pharmaceutical drugs to clinically significant or even toxic levels.

P-Glycoprotein Inhibition

It has been proposed that piperine inhibits P-glycoprotein (PGP), thus increasing fexofenadine bioavailability. Previous evidence from in vitro and animal studies does suggest that piperine inhibits PGP, but more clinical evidence is needed to determine if piperine interacts with other PGP substrates with a greater risk of toxicity, such as digoxin.

Reproductive and Embryotoxic Signals (Animal Data)

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, as well as due to the lack of investigation of the potentially adverse effects observed in animal studies and/or combined administration of piperine with other substances.

Limitations of the Overall Evidence Base

The literature study revealed the need for a thorough investigation of the pharmacological characteristics of the extracts and isolated compounds from P. retrofractum. P. retrofractum has the potential for the treatment of several diseases and disorders, but there are only a few studies done to investigate the plant phytochemicals; thus further studies should be focused on isolation and identification of active compounds with pharmacological activities. The overwhelming majority of pharmacological data derives from in vitro and animal studies; adequately powered, double-blind, placebo-controlled human clinical trials are largely absent for P. retrofractum as a whole botanical preparation.

References

Health Conditions

Health conditions that Javanese long pepper may help support.

No conditions available.

Body Systems

Body systems that Javanese long pepper may help support.

No body systems available.