Allspice

Allspice (Pimenta dioica): A Comprehensive Reference

1. Identity and Botanical Classification

Scientific Nomenclature and Taxonomy

The dried unripe berries of Pimenta dioica [(L.) Merr.] are termed allspice. Allspice, or Pimenta dioica, belongs to the family Myrtaceae, which includes cloves (Syzygium aromaticum) and guava (Psidium guajava). The full accepted binomial authority is Pimenta dioica (L.) Merr.; synonyms recorded in the literature include Pimenta officinalis Lindl. and Eugenia Pimenta DC.

When Columbus discovered the herb in Jamaica at the beginning of the 16th century, he gave it the genus name Pimenta, from the Spanish word "pimienta" for peppercorn. The species name dioica comes from "dioecious plant," meaning the male and female reproductive parts grow on separate plants. While the genus Pimenta consists of about 18 species of aromatic shrubs and trees, all native to the tropical regions of the Americas, P. dioica (allspice) is the most commercially important species of the genus.

Common Names

Allspice is also called Jamaican pepper, Pimenta, or Newspice. Additional names include clove pepper and pimento. It was the multifarious aroma of the dried berry that led 17th-century English explorers to coin the term "allspice," a name that has persisted in the English-speaking world, despite the plant's distinct botanical identity as a singular species rather than a mixture.

Plant Description and Natural Source

A native plant from the Caribbean island Jamaica, P. dioica belongs to the family Myrtaceae. Unlike common black peppercorns, which are fruits from a tropical vine (Piper nigrum), native to South Asia, Pimenta is a typical evergreen tree with a height of 22 feet. Occasionally the trees grow up to 43 feet tall with light gray bark and dark green leaves (4–8 cm long). Small whitish flowers grow on the allspice tree in the summer, producing berries. The berries are picked while still green and dried in the sun. The berries become brown when dried and look like large peppercorns.

This tree is native to the West Indies, Central America, and Mexico. The parts of the plant primarily used for extract are the dried, full-grown but unripe fruit and the leaves. Major producers are found in Jamaica and Cuba. It is commercially grown in Mexico, Honduras, Trinidad, Cuba, and Jamaica. Jamaica is the world's largest producer of allspice, producing a product with a higher level of essential oils, making it more flavorful.

Common Forms and Preparations

Allspice is commercially available and used in multiple forms:

• Whole dried berries: The berries are picked while still green and dried in the sun, becoming brown and resembling large peppercorns.
• Ground powder: Widely used as a culinary spice in whole or ground form.
• Essential oil (berry oil and leaf oil): Allspice contains about 4% volatile oil; the major component of the volatile oil (known as pimenta, pimento, or allspice oil) is eugenol (about 60%–80%). The leaf oil (pimento leaf oil) contains more eugenol (up to about 96%) than the berry oil, and is similar in composition to clove leaf oil.
• Aqueous extract / decoction: Used in ethnomedicine and laboratory research. In efforts to mimic the route at which allspice is consumed, researchers have extracted powdered allspice berries in water by boiling.
• Tinctures and liquid extracts: Used in herbal medicine formulations.
• Topical preparations: Poultices and ointments applied externally in traditional contexts.

2. Traditional and Historical Use

Pre-Columbian and Indigenous Mesoamerican Use

Allspice, the fruit of Pimenta dioica (L.) Merrill, is a native tree of tropical forest in Mesoamerica that eventually became highly valued as a spice in global markets. The uses of allspice have been traced back to the Aztec civilization, when the natives supposedly used the herb for flavoring. The first written record of what is probably allspice occurs in an entry for November 1492 in Christopher Columbus's journal of his first voyage.

P. dioica grows in Guatemala in two northern departments inhabited by Mayan people, especially the Q'eqchi' ethnic group, who use the aerial parts in traditional medicine mainly as an anesthetic and as a digestive. In Totonaca indigenous communities in the Sierra Norte de Puebla, Mexico, allspice has medicinal use and is used as a condiment for food; other technological and cultural uses have also been recorded.

Caribbean and Central American Folk Medicine

All parts of P. dioica are used in folk medicine, the kind of medicine developed over centuries by empirical and anecdotal evidence and other approaches. In the Caribbean, there is a long history of using allspice berries for folk healing. Jamaicans drink hot tea with allspice for colds, dysmenorrhea (menstrual cramps), and dyspepsia (upset stomach). Costa Ricans are known to use allspice to treat dyspepsia and diabetes.

Guatemalans are known to apply crushed allspice berries to bruises, sore joints, and for myalgia (muscle ache). In Cuban medicine, allspice along with other herbal mixtures is used to relieve indigestion. Allspice is known as a folk remedy used for treatment of high blood pressure, obesity, and digestion problems in Central America, as well as treatment for menstrual cramps and abdominal pain in Caribbean culture. Allspice is also used in traditional medicine to treat digestive disorders and as a remedy for corns, neuralgia, and rheumatism.

Colonial-Era and European Use

Initially confused with other pepper-like spices, allspice was partially marginalized during the first two centuries of Spanish colonization, but later support from the Spanish Crown helped it to become actively traded beginning in the 18th century. In Europe, anecdotal uses of allspice extract for dyspepsia and as a purgative exist. Northern Europeans used allspice in sausages and pickled fish.

Indian and Ayurvedic Tradition

The Jamaican pepper plant Pimenta dioica contains medicinal compounds that have been exploited by the native Caribbean population as well as medical systems of distant countries, such as India, where it has a known entry in the Ayurveda system of medicine. In India, P. dioica is mainly used as a stimulant and as an adjutant to tonics and laxatives. Its use in Indian traditional medicine includes relief of respiratory congestion and assorted odontalgia (toothache).

3. Key Constituents and Active Compounds

Volatile Oil Composition

Allspice contains about 4% volatile oil, though storage of undried berries under conditions that prevent rapid removal of moisture can increase the volatile oil content by up to 50%. Eugenol (60–90% in the berries, >90% in the leaves) is the key component, followed by 1,8-cineole, α-humulene, β-caryophyllene, and cadinene derivatives of pimenta essential oil. Other constituents include methyl eugenol, 1,8-cineol, l-α-phellandrene, caryophyllene, and 2 epimeric 10-cadinols. There are more than 36 constituents comprising the volatile oil component of allspice.

Polyphenols and Other Non-Volatile Constituents

Besides volatile oil, other constituents of allspice include quercetin, glycosides, catechins, proanthocyanidins, proteins, lipids, carbohydrates, vitamins (A, C, thiamine, riboflavin, niacin), and minerals. Many phenolic compounds such as ericifolin, eugenol, gallic acid, and quercetin have been isolated from P. dioica berries. Pimenta species have been reported to include various classes of phytochemicals like tannins, saponins, flavonoids, phenylpropanoids, monoterpenes, sesquiterpenes, and essential oils. Quercetin glycosides and eugenol derivatives are the predominant compounds of this genus.

The principal identified bioactive compounds and their chemical identities are:

• Eugenol (4-allyl-2-methoxyphenol): The most important component isolated from allspice with strong antioxidant activity is eugenol, which composes 60–90% of the essential oil extracted from allspice berries. The predominance of eugenol is noteworthy, as it is an aromatic phenolic compound of significant biological and commercial importance. Eugenol exhibits a range of biological activities, including antibacterial, antiviral, antifungal, anticancer, anti-inflammatory, and antioxidant properties.
• Quercetin (2-(3,4-dihydroxyphenyl)-3,5,7-trihydroxy-4H-chromen-4-one): A flavonoid with antioxidant activity present in allspice berries and leaves.
• Gallic acid (3,4,5-trihydroxybenzoic acid): A phenolic acid contributing to antioxidant and antiproliferative activities. Several phenolics have been identified including ericifolin, gallic and ellagic acid derivatives, in addition to flavonoids. Recent studies have shown that eugenol and gallic acid have selective antiproliferative and anti-tumor properties on human cancer cells and their animal models.
• Ericifolin (Eugenol 5-O-β-(6′-O-galloylglucopyranoside)): Ericifolin, Eugenol 5-O-galloylglucoside, was first isolated from a leaf extract of Melaleuca ericifolia, whose oil showed antimicrobial and anti-inflammatory activities. Very preliminary studies found that it possesses antibacterial activity.
• β-Caryophyllene: A sesquiterpene identified as a dominant constituent of the essential oil, alongside eugenol and methyl eugenol.
• Methyl eugenol: A constituent of the essential oil; methyl eugenol is a naturally occurring constituent found in common culinary herbs and spices including allspice.

Established Mechanisms of Action

Pharmacological evidence highlights strong antibacterial, antifungal, antioxidant, anti-inflammatory, and anticancer properties, mediated through mechanisms including membrane destabilization, quorum-sensing inhibition, mitochondrial depolarization, autophagy induction, and modulation of NF-κB pathways.

For the key compound eugenol specifically:

• The reason allspice is used for treating indigestion may be due to the abundance of eugenol, which is known to stimulate digestive enzymes. Furthermore, eugenol has analgesic effect in neuralgia and is often used as an anesthetic by dentists.
• Eugenol could potentially contribute to the anti-inflammatory function associated with allspice in traditional medicine.
• Eugenol (EUG) is a versatile naturally occurring molecule as a phenolic monoterpenoid and is frequently found in essential oils in a wide range of plant species.
• For ericifolin: Purified ericifolin from aqueous allspice extract (AAE) shows strong antiproliferative, pro-apoptotic, pro-autophagy, and anti-androgen receptor activities.

4. Scientific Evidence by Area of Use

4.1 Antimicrobial Activity

Systematic investigation of aromatic constituents of Pimenta leaves and its unripe berries has resulted in discovery of many novel aromatic compounds, mostly glycosides and polyphenols that show antibacterial, hypotensive, anti-neuralgic, and analgesic properties. GC-MS analysis of the ethanolic extract confirms the presence of eugenol as a potent bioactive compound, and the ethanolic extract of the plant proved to have an anti-microbial effect. The ethanolic extract has demonstrated antimicrobial effect on disease-causing microbes such as Pseudomonas aeruginosa, Bacillus anthracis, and Klebsiella pneumoniae.

Evidence strength: Apart from use for spices and fragrance, allspice has been evaluated in in vitro studies for its antimicrobial, cytotoxic, and women's health effects. However, clinical studies are lacking. All available antimicrobial evidence is from in vitro laboratory testing; no clinical (human) trials have been conducted.

4.2 Antioxidant Activity

The antioxidant content of P. dioica leaf extract was evaluated by ferrous ion chelating assay, nitric oxide radical scavenging assay, and DPPH test. The antioxidant activity was found to be increased with increasing concentration of ethanol extract. Phytochemical screening indicates the presence of carbohydrate, protein, steroid, alkaloid, flavonoids, phenol, and terpenoids in the ethanolic extract. The presence of a greater amount of eugenol in the essential oil, total antioxidant capacity, total phenolic content, and total flavonoid content in leaf extracts undoubtedly demonstrate potential of Pimenta dioica essential oil and leaf material as a raw material for food, perfumery, and cosmetic industries.

Evidence strength: Antioxidant properties are well-documented at the in vitro level across multiple methodologies. No human clinical trials have examined in vivo antioxidant effects specifically attributable to allspice supplementation.

4.3 Cardiovascular / Hypotensive Effects

Known as a folk remedy used for treatment of high blood pressure, obesity, and digestive problems in Central America, the cardiovascular effects of Pimenta dioica were investigated. Hypotensive action shown by decreased blood pressure level was confirmed by giving Sprague-Dawley rats intravenous administration of aqueous extract of Pimenta dioica.

A specific preclinical study (PubMed PMID 9173181) examined this question in detail: The hypotensive activity of ethanolic and aqueous extracts of Pimenta dioica and several fractions of the aqueous extract was observed in anaesthetized normotensive rats. General effects of the extracts and fractions were assessed through Hippocratic screening, showing a CNS depressant effect. Intravenous (i.v.) administration of the aqueous extract of Pimenta dioica (30, 70, 100 mg/kg) produced a dose-related significant fall in mean arterial blood pressure (MAP). The ED50 was 53.94 mg/kg. The hypotensive effect of identical doses (100 mg/kg) of the aqueous extract (95% decrease) was significantly greater (P < 0.05) than the effect of the ethanolic extract (67% decrease). The final aqueous fraction produced the greatest hypotensive activity compared to the other fractions. There were no significant changes in heart rate and no abnormalities were observed in the EKG.

It has been reported that the P. dioica leaf extract has a central nervous system (CNS) depressant effect. Analgesic and hypothermic effects were also observed with no significant changes in heart rate, body weight, and no other abnormalities. Importantly, it is noted that the aqueous fraction of allspice generated a greater hypotensive effect than the ethanol extract of identical doses.

Evidence strength: Preclinical (animal model) evidence only. No human clinical trials have evaluated the hypotensive effects of allspice extracts.

4.4 Anti-Inflammatory and Analgesic Effects

Extracts obtained from Pimenta stems have been confirmed to have good antimicrobial activity in addition to analgesic and anti-inflammatory properties. The good anti-inflammatory effects are not only attributed to the inhibition of mediators that promote inflammation but also due to reduction of inflammatory edema.

Allspice has shown antioxidant, hypotensive, antimicrobial, and antiproliferative activity, as well as analgesic, antipyretic, antiulcer, and cytoprotective activity in in vivo models. However, anti-inflammatory activity from allspice is controversial, as there is a report where the P. dioica essential oil did not reduce the pro-inflammatory interleukin (IL)-6 or tumor necrosis factor alpha (TNF-α) production, nor enhance the anti-inflammatory IL-10 production.

Evidence strength: Preclinical (animal and in vitro) evidence for analgesic and anti-inflammatory effects exists, but the literature contains conflicting findings. No human clinical trials have been conducted.

4.5 Anticancer / Antiproliferative Properties

This is currently the most extensively researched area of allspice pharmacology. The research group of Zhang and Lokeshwar at the University of Miami has published the most detailed work:

In one study, the researchers demonstrated strong and potentially clinically applicable antiproliferative and antitumor activities of an aqueous allspice extract (AAE) and established that most of the antitumor activities of AAE were concentrated in a single, purified bioactive compound, ericifolin (EF). EF reproduced antiproliferative and antiprostate cancer properties exhibited by AAE, suggesting that EF is one of the active anticancer compounds present in allspice berries.

In the breast cancer model: The researchers showed potent cytotoxic and anti-tumor activities of AAE in breast cancer cells, but the mechanisms by which tumor cells are killed and tumor growth is halted were completely different from those observed in prostate cancer models. Evidence was presented to show that tumor cell death was due to induction of autophagy with a lack of apoptosis or cell cycle arrest. Both chemo-preventive and antitumor activity of orally administered (gavage) AAE was demonstrated in the MDA-MB231 breast cancer model in athymic mice. Importantly, these effects, driven by autophagy both in vitro and in vivo, were different from the cell cycle arrest or apoptosis found in prostate cancer models, and ericifolin has limited activity against breast cancer cells.

Characterization of AAE showed the presence of polyphenols at up to 35% of dry-weight of AAE and the existence of unique antitumor compounds that are specific to prostate or breast cancers, and mutually exclusive.

Ericifolin, gallic acid, and eugenol derivatives have demonstrated anti-tumor, apoptotic, cytotoxic, chemopreventive, and anti-proliferative properties by increasing the levels of autophagy markers LC3B and LC3B-positive puncta and downregulating Akt and mTOR phosphorylation in breast cancer (triple negative breast cancer, TNBC – MDA-MB231 cells).

It has been reported that polyphenols isolated from the methanol extract of P. dioica leaves remarkably inhibit the cell growth of HepG2 and HCT-116 cells with less effect on MCF-7 cells. Further studies showed a pro-proliferative effect on non-tumorigenic cells such as 1301 and RAW 264.7 cells.

Evidence strength: All evidence is from in vitro cell-line studies and in vivo animal models (primarily athymic mice). Despite its wide-ranging utility, significant knowledge gaps remain regarding clinical validation of therapeutic benefits. No human clinical trials have been completed for any anticancer application of allspice or its constituents. The research is preliminary and proof-of-concept only.

4.6 Antidiabetic / Metabolic Effects

Costa Ricans are known to use allspice to treat dyspepsia and diabetes — a traditional use recorded ethnobotanically. Systematic study of aromatic constituents of P. dioica leaves and its berries has resulted in the discovery of several aromatic compounds like glycosides, polyphenols, and flavonoids that show many medicinal properties such as anti-inflammatory, antidiabetic activity, antiseptic, anticancer activity, antifungal activity, antioxidant activity, antimicrobial activity, anti-ulcer properties, and nematicidal activity.

Evidence strength: Primarily traditional ethnobotanical claim; laboratory research has identified constituents with antidiabetic potential, but dedicated clinical evidence is absent. The documented bioactive impact of allspice, particularly its effects on obesity and its metabolic disturbances, remains unexplored.

4.7 Digestive System Effects

Allspice is used for treating indigestion, which may be due to the abundance of the common polyphenol eugenol, known to stimulate digestive enzymes. Allspice is used for indigestion, as an antiseptic, anthelmintic, febrifuge, and for anesthetic activity.

Evidence strength: Mechanism-plausible based on the known properties of eugenol; the digestive use is among the most longstanding traditional applications, but controlled human trials are absent.

4.8 Skin and Cosmetic Applications

In vitro enzyme inhibition assays were assessed to estimate the anti-wrinkle property via collagenase, elastase, and hyaluronidase inhibitory activities. GC-MS analysis of tested oil revealed predominance of eugenol (56.62%), β-myrcene (15.41%), D-limonene (11.38%), and chavicol (5.36%). In vitro assays showed significantly higher elastase and hyaluronidase inhibitory activities of the allspice-loaded cream compared to the allspice-HA containing cream or the reference products. These findings showed the suitability of allspice and allspice-HA creams as novel anti-wrinkle preparations, with a recommendation for in vivo studies and clinical trials.

Evidence strength: In vitro only; no human clinical trials for dermatological applications exist at this time.

5. Body Systems and Health Areas Associated with Allspice

• Gastrointestinal / Digestive System: Historically and pharmacologically associated with relief of indigestion, dyspepsia, flatulence, and stimulation of digestive enzymes via eugenol.
• Cardiovascular System: Preclinical evidence for hypotensive effects via aqueous extracts; traditional use for blood pressure management in Central America.
• Musculoskeletal System: Traditional topical use for bruises, sore joints, myalgia, and rheumatism across multiple cultures.
• Nervous System / Analgesic: Eugenol is a well-established dental anesthetic; preclinical analgesic and CNS depressant effects observed.
• Oncology (preclinical): In vitro and animal-model research on prostate cancer, triple-negative breast cancer, hepatocellular carcinoma, and colorectal cancer cells.
• Antimicrobial: In vitro activity against bacteria including Staphylococcus aureus, Pseudomonas aeruginosa, Bacillus anthracis, and Klebsiella pneumoniae, as well as antifungal activity.
• Dermatological: In vitro evidence for anti-wrinkle (enzyme inhibitory) activity; traditional topical use for wounds and bruises.
• Reproductive / Gynecological: Traditional use for dysmenorrhea and menstrual cramps in Caribbean cultures.
• Metabolic / Endocrine: Traditional use for diabetes in Costa Rica; preliminary laboratory research.

6. Dosage Forms and Reported Dosages

There are no clinical applications for P. dioica and no clinical evidence to provide dosing recommendations. The following dosages appear only in the preclinical literature and should be understood as such:

• Animal (hypotensive) studies: Intravenous administration of the aqueous extract of Pimenta dioica at doses of 30, 70, and 100 mg/kg produced a dose-related significant fall in mean arterial blood pressure. The ED50 was 53.94 mg/kg in Sprague-Dawley rats.
• In vitro (anticancer) studies: In cytotoxicity testing, a 48-well plate was seeded with 5 × 10³ cells/well and treated with AAE fractions (100 µg/ml) for 72 hours, with cell viability estimated by MTT assay.
• In vivo (breast cancer) model: Both chemo-preventive and antitumor activity of orally administered (gavage) AAE was demonstrated in the MDA-MB231 breast cancer model in athymic mice.

Allspice is commonly used as a flavoring in foods. As a medicine, there is not enough reliable information to know what an appropriate dose of allspice might be.

7. Safety Considerations and Interactions

Regulatory Safety Status

Allspice is GRAS (generally recognized as safe) when used as food. Ingestion in excess of amounts found in food should be avoided because safety and efficacy are unproven. The principal active constituent, eugenol, carries its own regulatory assessment: eugenol is currently approved by the U.S. Food and Drug Administration (FDA) for use as a food additive and generally recognized as safe (GRAS) by the FDA (21 CFR 184.1257). The World Health Organization (WHO) has declared eugenol as a non-mutagen and generally recognized as safe (GRAS) molecule.

Toxicity

Allspice is not generally associated with toxicity, but eugenol can be toxic in high concentrations. Ingestion of extracts may produce toxicity and affect the CNS. Ingestion of more than 5 mL of allspice oil may induce nausea, vomiting, CNS depression, and convulsions.

The extensive toxicology database for eugenol provides context: Eugenol demonstrates low toxicity throughout its toxicity database. No adverse effects were observed up to the highest dose tested (300 mg/kg/day) (with one study having a NOAEL of 300 mg/kg/day and a LOAEL of 625 mg/kg/day based on decreased body weight) in the eugenol toxicity database.

Regarding the constituent methyl eugenol: Rodent studies show that hepatotoxic events are minimal in the dose range of 1–10 mg/kg body weight, which is approximately 100–1,000 times the anticipated human exposure from spices. For these reasons, it is concluded that present exposure to methyl eugenol resulting from consumption of food, mainly spices, does not pose a significant cancer risk.

Mucosal and Contact Irritation

Allspice can irritate mucosa. Occupational contact dermatitis has been documented: cases of dermatitis have been reported among chefs or workers in kitchens, coffee rooms, and restaurants. In all cases the dermatitis affected the hands, and the causative spices included garlic, cinnamon, ginger, allspice, and clove. The same patients had positive patch-test reactions to carrot, lettuce, and tomato. Some people are allergic to allspice.

Drug Interactions

An in vitro experiment suggests allspice may upregulate cytochrome P450 3A4 (CYP3A4) activity; however, the relevance of this finding is unknown. CYP3A4 is involved in the metabolism of a large proportion of pharmaceutical drugs, meaning theoretically that allspice extracts or concentrated preparations could alter the bioavailability of co-administered medications, though no clinical confirmation of this exists.

No drug interactions are well documented for allspice at culinary doses.

Special Populations

The FDA advises to avoid ingestion in excess of amounts found in food because safety and efficacy are unproven. Formal safety studies in pregnancy, lactation, pediatric populations, or individuals with liver disease have not been published in the peer-reviewed literature for allspice as a supplement.

8. Summary of Evidence Quality

The overall body of scientific evidence for allspice as a therapeutic agent beyond culinary use remains predominantly preclinical. Allspice has been evaluated in in vitro studies for its antimicrobial, cytotoxic, and women's health effects; however, clinical studies are lacking. The most substantive mechanistic and in vivo research pertains to anticancer properties of aqueous allspice extract and its constituent ericifolin in prostate and breast cancer animal models. The cardiovascular (hypotensive) effects have been validated in rodent models. Antioxidant, antimicrobial, and anti-inflammatory properties are supported by laboratory evidence but have not been confirmed in registered human clinical trials. Significant knowledge gaps remain regarding standardization of chemotypes and clinical validation of therapeutic benefits.

References

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