Pippali (Piper longum Linn.), commonly known as long pepper, is an important medicinal plant belonging to the family Piperaceae. Its therapeutic potential has been recognised in Ayurveda, where it is traditionally classified as a Rasayana (rejuvenative) and a Deepana-Pachana (digestive stimulant).
It has been used in the traditional management of respiratory ailments, digestive disorders, and metabolic disturbances. Its medicinal significance is reflected in classical Ayurvedic texts, including the Charaka Samhita, Sushruta Samhita, and Bhava Prakasha, in which it is included in several therapeutic groups.1
Botanical characteristics and phytochemical composition
Piper longum is an aromatic, climbing plant characterised by creeping, jointed stems and cordate leaves with entire margins. Its flowers develop in pendulous spikes, while its yellowish-orange fruits are borne on fleshy spikes. Flowering generally occurs during the rainy season, followed by fruiting in autumn. The plant is distributed across the warmer regions of India, including the central Himalayas, Assam, and the Western Ghats.
Several bioactive compounds have been identified in Pippali, including piperine, piplartine, piperlongumine, piperlonguminine, pipernonaline, pipercide, sesamin, β-sitosterol, essential oils, mono- and sesquiterpenes, aristolactams, and 4,5-dioxoaporphines. These constituents have been investigated for their potential antioxidant, anti-inflammatory, antimicrobial, and other pharmacological effects.
Pharmacological properties of Pippali
Antimicrobial activity:
- Antibacterial and antifungal activities have been demonstrated by P. longum extracts and essential oils in experimental investigations.
- Activity against selected Gram-positive and Gram-negative bacteria, as well as certain fungi, has been reported. These effects have been attributed to potential interference with microbial cell membranes and other cellular processes.
- The plant has consequently been investigated as a possible source of antimicrobial compounds, including agents that may be active against selected antibiotic-resistant bacteria. However, clinical effectiveness against human infections remains to be established.
Antioxidant and hepatoprotective effects:
- Antioxidant activity has been demonstrated by P. longum extracts through the scavenging of free radicals and the modulation of oxidative stress. Increased activities of endogenous antioxidant enzymes, including superoxide dismutase, catalase, and glutathione peroxidase, have been reported in experimental studies.
- Hepatoprotective effects have also been observed in toxin-induced liver injury models. Reductions in serum hepatic enzyme levels, improvements in liver histology, decreased lipid peroxidation, and increased reduced glutathione levels have been reported.
- Piperine has additionally been investigated for its potential to mitigate oxidative liver injury associated with certain antitubercular drugs. These findings remain predominantly preclinical.
Anti-inflammatory activity:
- Anti-inflammatory effects have been attributed to Pippali and its principal alkaloid, piperine.
- Modulation of inflammatory pathways, including nuclear factor kappa B (NF-κB) signalling, and reductions in pro-inflammatory mediators such as tumour necrosis factor-alpha (TNF-α), interleukin-6 (IL-6), and prostaglandins have been reported.
- Inhibition of prostaglandin and leukotriene production has also been investigated as a potential mechanism. These properties suggest possible therapeutic relevance in inflammatory conditions, although clinical benefits have not been conclusively established.
Immunomodulatory activity:
- Immunomodulatory effects have been reported in experimental models following administration of Pippali preparations. Increased macrophage activity, phagocytosis, and immunoglobulin levels have been observed, suggesting effects on cellular and humoral immune responses.
- These findings provide preliminary support for its traditional use but do not establish its efficacy as an immunotherapeutic agent in humans.
Gastrointestinal and antidiarrhoeal effects:
- Pippali has traditionally been used to support digestion and manage gastrointestinal complaints.
- Gastroprotective effects, including the preservation of gastric mucosal integrity and modulation of gastric acidity, have been investigated experimentally.
- Piperine has also demonstrated anti-diarrhoeal activity in experimental studies of diarrhoea induced by castor oil, magnesium sulphate, and arachidonic acid. Inhibition of intestinal fluid accumulation has been proposed as a possible mechanism.
- Anti-amoebic activity has additionally been reported for ethanolic fruit extracts in experimental studies.
Metabolic, renal, and anabolic effects:
- Hypoglycaemic effects have been investigated in experimental models, with potential mechanisms involving insulin secretion, insulin sensitivity, and oxidative stress modulation in pancreatic β-cells. Anabolic effects, including increases in body weight and serum albumin and globulin levels, have also been reported following administration of Pippali Rasayana in preliminary studies. Thyroid-related effects, including increased thyroid peroxidase activity and basal metabolic rate, have been described in experimental research.
- Potential renoprotective effects have been investigated using gallic acid and piperine in models of beryllium-induced toxicity. Their combined administration was associated with improvements in biochemical abnormalities and oxidative stress. However, these findings do not establish the efficacy of Pippali itself in preventing or treating kidney disease.
Anticancer and neuroprotective potential
- Pippali and other constituents have demonstrated anticancer activity in preclinical models, including the induction of apoptosis, suppression of tumour growth, and modulation of cellular signalling pathways.
- Neuroprotective effects have also been investigated, with improvements in memory-related outcomes, modulation of neurotransmitters, and reductions in neuronal damage reported in experimental models of neurodegeneration.
- Further research is needed before these findings can be translated into clinical applications.
Safety considerations
Pippali preparations have generally been reported to be tolerated at certain doses in experimental studies. However, differences in toxicity have been observed among extracts and isolated constituents, including piperine, piperlongumine, and piperlonguminine. Findings from animal toxicity studies cannot be directly extrapolated to human safety. Appropriate dosing, potential interactions with medicines, and long-term effects require further investigation.
Conclusion
Pippali (Piper longum) is an important Ayurvedic medicinal plant with a diverse phytochemical profile and promising pharmacological properties. Antimicrobial, antioxidant, hepatoprotective, anti-inflammatory, immunomodulatory, gastrointestinal, metabolic, anticancer, and neuroprotective effects have been investigated, primarily in experimental settings. Although these findings provide a scientific basis for further research into its traditional applications, robust clinical evidence is needed to establish its efficacy, safety, appropriate dosage, and therapeutic role in modern medicine.2,3
References:
- Singhal HK, Vyas PP, Neetu. Unveiling Pippali: A critical review of its medicinal significance in Ayurveda and beyond. J Biol Sci Opin. 2025;13(3):22-26. https://www.researchgate.net/publication/394082165_UNVEILING_PIPPALI_A_CRITICAL_REVIEW_OF_ITS_MEDICINAL_SIGNIFICANCE_IN_AYURVEDA_AND_BEYOND
- Bhatia A, Mehta J, Hashmi AR, et al. From Ancient Spice to Advanced Science: Therapeutic, Nutraceutical and Nanotechnological Insights into the Fruits of Piper Longum Linn for Modern Drug Development. Drug Des Devel Ther. 2026;20:556602. Published 2026 Feb 12. doi:10.2147/DDDT.S556602 https://pmc.ncbi.nlm.nih.gov/articles/PMC12912085/
- Biswas P, Ghorai M, Mishra T, et al. Piper longum L.: A comprehensive review on traditional uses, phytochemistry, pharmacology, and health-promoting activities. Phytother Res. 2022;36(12):4425-4476. doi:10.1002/ptr.7649 https://onlinelibrary.wiley.com/doi/10.1002/ptr.7649