INTRODUCTION:

Medicinal herbs have progressively transitioned from marginal to mainstream healthcare owing to the growing preference for natural therapies that are perceived to offer fewer adverse effects than synthetic drugs¹. The economic status of a medicinal plant in the worldwide market depends on the physical nature of the end products². India possesses a rich biodiversity and officially recognizes more than 3,000 plant species for their medicinal value, while approximately 6,000 species are estimated to be utilized in traditional, folk, and herbal medicine systems³. In recent years, substantial research efforts have focused on the identification, characterization, and validation of bioactive compounds derived from plants for the management of various diseases. Notably, over 25% of modern pharmaceuticals are reported to be directly or indirectly derived from plant sources, highlighting the critical role of medicinal plants in drug discovery³. Indian medicinal flora represents an abundant reservoir of pharmacologically active principles widely employed as household remedies for multiple ailments. Since the early 1990s, the use of forest-based medicinal resources has also emerged as an important source of livelihood, thereby increasing concern for their sustainable utilization. Traditional Indian medicine encompasses several well-established systems, including Ayurveda, Siddha, Unani, and Homoeopathy, wherein drug evaluation relies on phytochemical, pharmacological, and advanced instrumental techniques such as chromatography and microscopy^3.With the emerging worldwide interest in adopting and studying traditional systems and exploiting their potential based on different health care systems, the evaluation of the rich heritage of traditional medicine is essential³.

Given the expanding global demand for plant-based therapeutics and the industrial significance of botanicals rich in bioactive compounds, Piper betel L. has attracted considerable scientific and commercial interest. The plant possesses a wide spectrum of ethnopharmacological uses and contains diverse phytoconstituents with demonstrated pharmacological activities, making it a promising candidate for applications in pharmaceutical, nutraceutical, cosmetic, and food industries. Therefore, a comprehensive evaluation of its traditional uses, bioactive constituents, and therapeutic potential is essential to support its rational utilization and industrial development. The present review aims to provide an integrated overview of the industrial and therapeutic applications of Piper betel L., with special emphasis on its ethnopharmacology, phytochemistry, and pharmacological properties^4-8.

Betel leaf (Piper betel L.) is a perennial climbing vine belonging to the family Piperaceae and is widely cultivated for its aromatic and medicinal leaves. The plant has been traditionally valued in India and other Asian countries for its cultural, social, and therapeutic significance. In India, the leaves are popularly known as paan and are commonly used as a mouth refresher after meals¹. In Sanskrit betel leaf is referred as “Nagavalli” or “Tamalpatra”, categorized under the “Talisapatra” group of herbs⁹; scientifically, the plant is referred to as Piper betel L¹.

Botanical Information:

Piper betel L. is a semi-woody perennial climber with short adventitious roots that aid in climbing. The plant bears glabrous, heart-shaped leaves possessing a strong aromatic odor and pungent or sweet taste. Variations in leaf characteristics such as size, color, aroma, and taste are influenced by the cultivar, nutritional composition, and chemical constituents². Based on these variations, betel leaves are known by different regional names across India, including Venmony, Magadhi, Salem, Kauri, Banarasi, Mysore, Bagerhati, Bangla, Kasi, Desavari, Meetha, Ghanagete, Sanchi, and Kapoori^1,2.

Geographical Distribution:

Malaysia is considered the place of origin of betel leaf cultivation²; India has developed a wide range of betel leaf varieties and remains one of the major producers, where the leaves are primarily consumed as a masticatory or mouth freshener. Betel leaf cultivation is also prevalent in several Southeast Asian countries, including Sri Lanka, Thailand, Taiwan, Malaysia, the Philippines, Bangladesh, and Burma¹. Globally, approximately 100 varieties of betel leaf have been reported, of which nearly 40 are found in India, while about 30 varieties are distributed in Bangladesh and West Bengal. Within India, extensive cultivation has been reported in states such as Odisha, Tamil Nadu, Madhya Pradesh, Uttar Pradesh, and Maharashtra¹.

Ethnopharmacology and Traditional Uses:

Betel leaf holds an important place in Hindu culture and is extensively used in religious, social, and ceremonial practices along with Areca nut. The leaves are considered the most valuable and edible part of the plant². Traditional Ayurvedic medicine describes betel leaf as a remedy that helps restore the balance of the three humours—Vatha, Pitha, and Kapha. The roots and fruits of Piper betel are traditionally used in the treatment of malaria and asthma¹⁰.

Several classical Ayurvedic formulations such as Lokantha Rasa, Puspadhava Rasa, Brhat Sarwajwarahara, Laghu Sutashekhara Rasa, and Brhat Vishamajwarantaka Rasa include Piper betel as a key ingredient. Betel leaf juice is commonly used as an adjuvant in Ayurvedic preparations to enhance therapeutic efficacy. According to Sushruta Samhita, tambool (betel) leaves are described as aromatic, sharp, hot, and acrid, and are considered beneficial for voice, appetite, and digestion, while pacifying Vata and aggravating Pitta¹⁰.

According to the Unani system of medicine, betel leaf is considered sharp, aromatic, and stimulant in nature, improving appetite, digestion, and acting as a tonic for the brain, heart, and liver. It is also believed to purify blood, relieve thirst, and clear the throat¹⁰. The wide ethnopharmacological use of Piper betel highlights its importance as a medicinal plant with significant therapeutic potential.

In folk medicine, betel leaf is used for the treatment of headache, itching, mastitis, cuts, abrasions, constipation, wounds, burns, eczema, lymphangitis, and respiratory disorders¹⁰. The juice of certain varieties, such as Kammaru, is reported to be effective in treating pharyngitis, abdominal pain, and swelling. Betel leaf is widely used in the form of betel quid, which consists of fresh betel leaf, areca nut, slaked lime, with or without tobacco. Betel quid chewing is believed to act as a natural tonic and breath freshener and is practiced by millions worldwide¹¹.

Chemical Constituents:

Piper betel leaves are rich in volatile oil, commonly known as betel oil, which represents the principal phytochemical constituent of the plant. The essential oil primarily contains phenolic compounds such as betel phenol (chavibetol) and chavicol, which contribute to the characteristic aroma and biological activity of the leaves. An alkaloid, arakene, has also been reported from the leaves and is noted to possess pharmacological properties similar to cocaine. The volatile oil content of the leaf ranges between 0.8 and 1.8% and includes chavicol, chavibetol, eugenol, allyl pyrocatechol, cineole, caryophyllene, cadinene, menthone and other terpenes¹².

The chemical composition of the essential oil varies among different plant parts and developmental stages. Safrole has been identified as a major constituent in the leaf, stalk, stem, and root, whereas β-phellandrene predominates in the fruit. Younger leaves have been reported to yield a higher quantity of essential oil compared to mature leaves, indicating age-dependent variation in phytochemical content^12,13.

Phytochemical investigations of Piper betel leaves and other plant parts have resulted in the isolation of several bioactive compounds, including hydroxychavicol, allyl pyrocatechol, chavibetol and its acetate derivatives, piperbetol, methylpiperbetol, piperol A, and piperol B. Analysis of the essential oil and ether-soluble fractions revealed fourteen components, among which chavibetol (53.1%) and chavibetol acetate (15.5%) were the major constituents. Minor components included allyl pyrocatechol diacetate, methyl eugenol, eugenol, α-pinene, β-pinene, limonene, safrole, and 1,8-cineole¹².

Additional phytochemicals reported from Piper betel include monoterpenes, monoterpenoids, and sesquiterpenes such as p-cymene, terpinene, eucalyptol, carvacrol, cadinene, and caryophyllene. The plant also contains various aliphatic compounds, sterols, triterpenoids, and flavonoid derivatives, including ursolic acid, β-sitosterol, stigmasterol, piperlonguminine, and allyl pyrocatechol derivatives. Distinct phytochemical profiles have been reported for different plant parts, including leaves, stems, roots, and fruits¹⁴.

Preliminary phytochemical screening studies indicate that the phytochemical composition of Piper betel is influenced by geographical origin and extraction solvent. Aqueous extracts have shown the presence of alkaloids, tannins, glycosides, reducing sugars, and saponins, while organic solvent extracts demonstrated higher levels of phenols, flavonoids, and tannins. Several studies have successfully isolated bioactive constituents such as phytol, 4-chromanol, and allyl pyrocatechol derivatives, highlighting the chemical diversity and therapeutic relevance of Piper betel^14,15.

Pharmacology Study:

Antimicrobial Properties:

Betel leaf (Piper betel L.) possesses strong antimicrobial activity due to bioactive compounds such as chavicol, chavibetol, allyl pyrocatechol, chavibetol acetate, and allyl pyrocatechol diacetate. These compounds inhibit a wide range of pathogenic microorganisms, including Escherichia coli, Streptococcus pyogenes, Pseudomonas aeruginosa, Staphylococcus aureus, and Proteus vulgaris, and also contribute to food preservation by preventing microbial spoilage and radiation-induced lipid peroxidation. The high phenolic content of ethanolic and methanolic extracts further enhances their antioxidant and antimicrobial potential¹.

Antifungal Properties:

Piper betel leaves exhibit broad-spectrum antifungal activity against Candida, aspergillus, Trichophyton, and Microsporum species, mainly due to phenolic compounds such as eugenol and chavicol. Ethanolic extracts and essential oil inhibit fungal growth and aflatoxin production, and also show synergistic effects with conventional antifungal drugs^1,14.

Antioxidant activity:

Hot water and cold ethanolic extracts of Piper betel leaves exhibit strong antioxidant activity, with effective free-radical scavenging that remains stable over time and even at temperatures up to 200 °C. This thermal stability indicates the robustness of its bioactive constituents and supports the potential of Piper betel as a natural antioxidant sources³.

Antidiabetic activity:

Spray-dried powder of Piper betel has demonstrated significant antidiabetic activity in diabetes mellitus patients. Its use as a nutraceutical was found to be effective in the management of type 2 diabetes, indicating the therapeutic potential of Piper betel as a natural adjunct in glycemic control³.

Oxidative and anti-Hemolytic Activities:

The aqueous extract of fresh Piper betel leaves shows significant antioxidative and anti-hemolytic activities, along with inhibitory effects against pathogens including Streptococcus pyogenes, Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli. These protective effects are mainly attributed to the synergistic action of flavonoids and polyphenolic compounds³.

Analgesic and Anti-Inflammatory Activities:

The hydroalcoholic extract of Piper betel leaves (HEPBL) exhibited significant analgesic and anti-inflammatory activities in experimental animal models. Analgesic effects were observed at doses of 100 and 200 mg/kg, while anti-inflammatory activity was significant at 50, 100, and 200mg/kg using standard in vivo models. A sub-therapeutic dose of 50mg/kg also enhanced the effect of standard analgesics. These activities are attributed to phytoconstituents such as flavonoids, tannins, phenols, and glycosides¹⁶.

Anti-Cancer Activity:

Reactive oxygen species (ROS) exhibit dual roles in cancer, contributing to DNA damage while also inducing apoptosis. Piper betel shows superior antioxidant and anticancer activity among Piperaceae. Its ethyl acetate extract is cytotoxic to MCF-7 cells, and hydroxychavicol inhibits PC-3 cell proliferation and induces ROS-dependent apoptosis, with dose-dependent effects¹².

Anti-Hypertensive Activity:

Betel leaves exhibit anti-hypertensive and cardioprotective effects by improving lipid profiles. Studies have shown that they reduce total cholesterol, triglycerides, LDL, and VLDL levels while increasing HDL cholesterol. These effects are mainly attributed to eugenol, which acts as a natural antioxidant, inhibits hepatic cholesterol biosynthesis, and reduces intestinal lipid absorption. Consequently, enhanced LDL catabolism and bile acid excretion contribute to the overall lipid-lowering activity of Piper betel¹⁷.

Protozoal diseases:

Protozoal diseases such as malaria, amoebiasis, leishmaniasis, and giardiasis are commonly associated with poor socioeconomic conditions. Scientific studies have demonstrated that Piper betel exhibits significant antiprotozoal activity against Giardia lamblia, Leishmania donovani, Entamoeba histolytica, and malarial parasites. These findings support the potential therapeutic role of Piper betel in the management of protozoal infections¹⁴.

Antilarval Activity:

Betel leaf exhibits significant antilarval activity against myiasis-causing Chrysomya species. Among essential oil, ethanolic, and aqueous extracts, the essential oil showed the highest efficacy, including against Chrysomya bezziana. These findings indicate strong larvicidal potential of Piper betel essential oil¹⁴.

Antiallergic Activity:

Piper betel leaf ethanolic extract exhibits significant antiallergic activity in vitro by reducing IgE-mediated hypersensitivity through inhibition of histamine release and GM-CSF production. It also suppresses eotaxin, interleukin-8, and TNF-α/IL-4–induced responses, indicating its potential as a promising natural antiallergic agent¹⁴.

Antifertility Activity:

Betel leaf extract exhibits antifertility activity by modulating the pituitary–gonadal axis and disrupting estrogen homeostasis. Studies in female rats showed reduced gonadotropin release, decreased reproductive organ weight, and lowered estrogen levels with ovarian alterations. Changes in serum glucose, cholesterol, and vitamin C suggest impaired estrogen synthesis. These reversible antiestrogenic effects highlight its pharmacological significance¹⁸.

Immunomodulatory Activity:

Methanolic extract of Piper betel leaves exhibits significant immunomodulatory activity in vitro and in vivo by modulating lymphocyte proliferation, interferon-γ receptor expression, nitric oxide production, and cellular immune responses. Dose-dependent suppression of lymphocyte proliferation and antibody titer suggests immunosuppressive potential, indicating possible application in autoimmune disorders and cancer therapy¹⁸.

As an Oral care Agent:

Dental caries results from acid-producing oral microorganisms, mainly Streptococcus mutans, that promote enamel demineralization. Aqueous extracts of Piper betel inhibit cariogenic and acidogenic pathogens, reducing plaque formation and acid production. These antimicrobial effects support the potential of betel leaf as a natural agent for oral hygiene and dental care¹⁸.

Nutritional Composition^2,15:

Betel leaves (Piper betel L.) are nutritionally rich and contain essential vitamins, minerals, proteins, enzymes, essential oils, and diverse bioactive compounds that contribute to their health-promoting properties. Fresh leaves are composed mainly of water (85–90%) along with appreciable amounts of protein, fiber, carbohydrates, minerals, and essential oils. They are notable sources of vitamins A, C, and B-complex, as well as minerals such as calcium, potassium, iron, iodine, and phosphorus. Betel leaves also contain polyphenols, tannins, alkaloids, saponins, and enzymes such as diastase and catalase, which contribute to their antioxidant and antimicrobial activities. Traditionally, betel leaf preparations have been used to support oral health, digestion, respiratory function, wound healing, and relief from inflammatory and microbial disorders, highlighting their nutritional and therapeutic significance.

Applications Of Piper Betel in the Food Industry ^1,2:

Piper betel L. has gained significant attention in the food industry due to its strong antimicrobial and antioxidant properties, which contribute to enhancing food safety and shelf life. These properties are primarily attributed to bioactive compounds such as chavibetol, chavicol, allyl pyrocatechol and eugenol, which exhibit broad-spectrum activity against Gram-positive and Gram-negative bacteria, fungi and protozoa. Several studies have demonstrated that betel leaf extracts are even more effective than conventional preservatives like hydrogen peroxide. Owing to these characteristics, both betel leaf and its essential oil are increasingly explored as natural preservatives and functional food ingredients.

Milk, being highly nutritious but perishable, is prone to rapid microbial growth. The use of natural preservatives, such as betel leaf extract, has shown promising results in maintaining microbial safety. Phenolic compounds present in the leaves are water-soluble, allowing easy incorporation into milk without altering its composition. Research indicates that raw milk containing 0.5% (v/v) betel leaf extract remained microbiologically safe for up to 11 hours at 37°C, highlighting its potential as a short-term milk preservative.

Dahi, one of the most commonly consumed fermented dairy products in India, is valued for its probiotic benefits. Incorporating betel leaf extract into Dahi has been shown to extend shelf life while maintaining its sensory qualities. Dahi prepared with 0.5% betel leaf extract exhibited improved pH stability, texture, and sensory acceptance compared to traditional Dahi during refrigerated storage for up to seven days. These effects are primarily due to the antioxidant and antibacterial properties of the extract.

Similarly, whey-based mango beverages, which are nutrient-rich products derived from dairy by-products, benefit from the addition of betel leaf distillate. This fortification enhances antioxidant activity, shelf life, and sensory acceptability. Bioactive compounds such as eugenol and chavicol provide preservative and therapeutic benefits, while mango juice contributes additional antioxidants and flavor, resulting in a functional beverage with improved quality.

Shrikhand, a semi-solid fermented dairy product widely consumed in Western India, also benefits from betel leaf incorporation. Goat milk Shrikhand fortified with sapota pulp and betel leaf extract demonstrated enhanced sensory attributes, including taste, flavor, and overall acceptability. The extract contributed functional value through its antimicrobial and antioxidant activities, ensuring improved shelf life and consumer appeal.

Beyond dairy, betel leaves are rich in micronutrients such as calcium and iron, making them suitable for value-added snack products. Betel leaf-based snacks, including Laddu, Namkeen, cutlets, and Sev, demonstrated high consumer acceptance in sensory studies. In several formulations, betel leaf snacks were preferred over mint-based alternatives, emphasizing both their nutritional and sensory advantages.

Incorporation of betel leaf ethanolic extract into noodles has also been explored, resulting in improved textural properties and overall acceptability. A concentration of 15% extract produced noodles with optimal softness and added functional benefits associated with betel leaf polyphenols, highlighting its potential for the processed food sector.

Betel leaf wine, a novel non-grape fermented beverage, has been developed using wild or commercial yeast. Wines prepared with commercial yeast showed higher levels of alcohol, polyphenols, and other phytochemicals compared to those produced with wild yeast. These findings indicate that betel leaf wine is safe for consumption and rich in bioactive compounds, making it a promising functional beverage.

The biochemical composition of betel leaf, including its antiseptic, antimicrobial, and antibacterial activities, supports its widespread use in the food and beverage industry. The incorporation of betel leaf extracts and essential oils into food products not only enhances product quality and sensory characteristics but also provides preventive and therapeutic benefits by inhibiting disease-causing microorganisms. Moreover, the increasing consumer preference for natural preservatives over chemical alternatives, such as benzoic and sorbic acids used in jams, jellies, pickles, and pastes, underscores the market potential of betel leaf. Its ability to extend shelf life, improve food safety, and contribute to functional and health-promoting properties makes Piper betel an invaluable resource for modern food processing and product development.

Economic Importance²:

The economic importance of betel leaf in the global market is largely influenced by the form and quality of its end products. Betel leaf is marketed in various value-added forms such as powders, oils, capsules, pharmaceuticals, oral-care products, cosmetics, and food supplements, which have high commercial demand. India exports betel leaves and related products to countries including Bangladesh, Pakistan, Malaysia, Indonesia, Myanmar, and Thailand, generating foreign exchange. The annual turnover of the betel vine industry is estimated at approximately Rs. 10,000 million, although cultivation and marketing costs vary significantly. Price fluctuations and high transportation costs affect farmer income, highlighting the need for a regulated marketing system.

Cultivation and Propagation of Piper Betel:¹⁸

Piper betel is cultivated in fertile, well-drained loamy soils rich in organic matter under tropical to subtropical conditions with high humidity, moderate shade, and rainfall above 179 cm. It is grown under natural or partially/fully controlled systems, often using support plants or traditional covered structures called bareja to regulate light, temperature, and moisture. Proper control of light and irrigation is essential, as imbalance affects leaf quality. Propagation is commonly done through stem cuttings or root division during spring or summer. Betel vine is widely cultivated across South and Southeast Asia, particularly in India and Bangladesh, as an economically important crop.

CONCLUSION:

Piper betel L. is a plant of considerable ethnopharmacological, nutritional, and economic importance, supported by its rich phytochemical profile and wide range of biological activities. Traditional medical systems such as Ayurveda, Siddha¹⁹, Unani, and various folk practices have long utilized betel leaf for the management of infections, inflammatory conditions, metabolic disorders, respiratory ailments, and oral health problems. Modern scientific studies substantiate these traditional claims, demonstrating potent antimicrobial, antifungal, antioxidant, antidiabetic, anti-inflammatory, analgesic, antiallergic, immunomodulatory, anticancer, antihypertensive, antiprotozoal, and antilarval activities. These effects are largely attributed to phenolic compounds including chavibetol, chavicol, eugenol, hydroxychavicol, and allyl pyrocatechol, along with terpenoids, flavonoids and sterols. The expanding applications of Piper betel in pharmaceuticals, nutraceuticals, and functional foods highlight its promise as a valuable natural resource for future therapeutic and industrial development^20-25.

The multifunctional nature of Piper betel extends beyond therapeutics into the industrial domain, particularly in pharmaceuticals, nutraceuticals, cosmetics, oral-care formulations, and functional foods. Its demonstrated antimicrobial and antioxidant properties support its growing application as a natural preservative and functional ingredient in dairy products, beverages, snacks, and other processed foods, aligning well with the global shift toward clean-label and plant-based alternatives to synthetic additives. Furthermore, the nutritional richness of betel leaves enhances their value as a health-promoting dietary component.

Economically, Piper betel represents an important cash crop in South and Southeast Asia, contributing significantly to rural livelihoods and export markets. However, challenges related to cultivation practices, post-harvest handling, price fluctuations, and sustainability necessitate the development of improved agronomic techniques, standardized quality control, and regulated marketing systems. Future research should emphasize clinical validation of pharmacological claims, elucidation of molecular mechanisms of action, toxicity and safety profiling, and development of standardized extracts and formulations.

Overall, Piper betel L. stands as a promising natural resource with immense potential for integrated industrial and therapeutic exploitation. Harnessing its traditional knowledge base alongside modern scientific validation can facilitate the development of novel, safe, and effective products, thereby reinforcing its role in global healthcare and bio-based industries.

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Received on 02.02.2026 Revised on 06.03.2026

Accepted on 08.04.2026 Published on 08.07.2026

Available online from July 13, 2026

Res. J. Pharmacognosy and Phytochem. 2026; 18(3):278-284.

DOI: 10.52711/0975-4385.2026.00040

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