Immunomodulatory Effects of Siddha Herbs in Infectious Diseases
Keywords:
Siddha medicine, Immunomodulation, Infectious diseases, Medicinal herbs, Nilavembu, Seenthil, Amukkara, Immune response, Antimicrobial activity, Traditional medicineAbstract
Background: Infectious diseases remain a significant global health concern, particularly with the emergence of antimicrobial resistance and recurrent outbreaks of viral and bacterial infections. Strengthening host immune responses has become an important strategy in preventing and managing infectious diseases. The Siddha system of medicine, one of the oldest traditional medical systems practiced in South India, utilizes numerous medicinal herbs known for their immunomodulatory, antimicrobial, antioxidant, and anti-inflammatory properties. These herbs have traditionally been employed to enhance disease resistance and promote overall health.
Objective: To review the immunomodulatory effects of Siddha medicinal herbs and evaluate their potential role in the prevention and management of infectious diseases.
Methods: A comprehensive literature review was conducted using electronic databases including PubMed, Scopus, Web of Science, Google Scholar, ScienceDirect, and the AYUSH Research Portal. Relevant studies published between 2000 and 2025 were screened. Classical Siddha literature and government publications were also consulted. Studies reporting immunomodulatory, antimicrobial, antiviral, antioxidant, and infection-related therapeutic activities of Siddha medicinal plants were included and critically analyzed.
Results: The review identified several Siddha herbs with significant immunomodulatory potential, including Tinospora cordifolia (Seenthil), Andrographis paniculata (Nilavembu), Withania somnifera (Amukkara), Phyllanthus emblica (Nellikai), Ocimum tenuiflorum (Tulsi), and Piper longum (Thippili). These medicinal plants were found to enhance innate and adaptive immune responses through mechanisms such as macrophage activation, cytokine modulation, lymphocyte proliferation, natural killer cell stimulation, and antioxidant activity. In addition, many of these herbs exhibited direct antimicrobial and antiviral properties, supporting their traditional use in infectious disease management. Evidence from experimental, preclinical, and clinical studies suggests that Siddha herbs may improve host resistance to infections and reduce disease severity.
Conclusion: Siddha medicinal herbs possess substantial immunomodulatory and antimicrobial properties that may contribute to the prevention and management of infectious diseases. Their multitarget mechanisms of action, combined with their traditional therapeutic relevance, make them promising candidates for integrative healthcare approaches. However, further well-designed clinical studies and standardization of herbal formulations are required to establish their efficacy, safety, and therapeutic applications in modern medicine.
References
1. World Health Organization. (2022). Global report on infection prevention and control. World Health Organization.
2. Murray, C. J. L., Ikuta, K. S., Sharara, F., Swetschinski, L., Aguilar, G. R., Gray, A., et al. (2022). Global burden of bacterial antimicrobial resistance in 2019: A systematic analysis. The Lancet, 399(10325), 629–655.
3. Chaplin, D. D. (2010). Overview of the immune response. Journal of Allergy and Clinical Immunology, 125(2 Suppl. 2), S3–S23.
4. Patwardhan, B., Vaidya, A. D., & Chorghade, M. (2004). Ayurveda and natural products drug discovery. Current Science, 86(6), 789–799.
5. Spelman, K., Burns, J., Nichols, D., Winters, N., Ottersberg, S., & Tenborg, M. (2006). Modulation of cytokine expression by traditional medicines. Alternative Medicine Review, 11(2), 128–150.
6. Vetvicka, V., & Vetvickova, J. (2014). Natural immunomodulators and their stimulation of immune reaction. Anticancer Research, 34(5), 2275–2282.
7. Uthamarayan, K. S. (2005). Siddha Maruthuvanga Churukkam. Directorate of Indian Medicine and Homoeopathy.
8. Balachandran, P., & Govindarajan, R. (2005). Cancer—An Ayurvedic perspective. Pharmacological Research, 51(1), 19–30.
9. Jayakumar, R. V., Thangavelu, L., & Natarajan, E. (2019). Traditional Siddha medicinal plants and their therapeutic applications. Journal of Ethnopharmacology, 235, 1–12.
10. Kirtikar, K. R., & Basu, B. D. (2005). Indian medicinal plants (2nd ed.). International Book Distributors.
11. Sharma, U., Bala, M., Kumar, N., Singh, B., Munshi, R. K., & Bhalerao, S. (2012). Immunomodulatory active compounds from medicinal plants. Journal of Chinese Integrative Medicine, 10(1), 49–57.
12. Kumar, D., Arya, V., Kaur, R., Bhat, Z. A., Gupta, V. K., & Kumar, V. (2012). A review of immunomodulators in traditional medicinal plants. Journal of Microbiology, Immunology and Infection, 45(3), 165–184.
13. Ministry of AYUSH. (2021). Guidelines for Siddha practitioners for COVID-19 management. Government of India.
14. Rastogi, S., Pandey, D. N., & Singh, R. H. (2022). COVID-19 pandemic: A pragmatic plan for Ayurveda intervention. Journal of Ayurveda and Integrative Medicine, 13(1), 100312.
15. Liberati, A., Altman, D. G., Tetzlaff, J., Mulrow, C., Gøtzsche, P. C., Ioannidis, J. P. A., et al. (2009). The PRISMA statement for reporting systematic reviews and meta-analyses of studies that evaluate healthcare interventions. BMJ, 339, b2700.
16. Page, M. J., McKenzie, J. E., Bossuyt, P. M., Boutron, I., Hoffmann, T. C., Mulrow, C. D., et al. (2021). The PRISMA 2020 statement: An updated guideline for reporting systematic reviews. BMJ, 372, n71.
17. Higgins, J. P. T., Thomas, J., Chandler, J., Cumpston, M., Li, T., Page, M. J., & Welch, V. A. (Eds.). (2019). Cochrane handbook for systematic reviews of interventions (2nd ed.). Wiley.
18. Ministry of AYUSH. (2024). AYUSH Research Portal. Government of India.
19. Anonymous. (2008). Siddha Materia Medica (Medicinal Plants Division). Department of Indian Medicine and Homoeopathy.
20. World Health Organization. (2019). WHO global report on traditional and complementary medicine. World Health Organization.
21. Upadhyay, A. K., Kumar, K., Kumar, A., & Mishra, H. S. (2010). Tinospora cordifolia (Willd.) Hook. f. and Thomson: A review of its ethnobotany, phytochemistry and pharmacology. International Journal of Pharmaceutical Sciences and Research, 1(2), 18–34.
22. Akbar, S. (2011). Andrographis paniculata: A review of pharmacological activities and clinical effects. Alternative Medicine Review, 16(1), 66–77.
23. Vetvicka, V., & Vannucci, L. (2013). Biological properties of medicinal plants and their immunomodulatory effects. Biomedical Papers of the Medical Faculty of the University Palacky, Olomouc, Czech Republic, 157(2), 103–110.
24. Singh, N., Bhalla, M., de Jager, P., & Gilca, M. (2011). An overview on Ashwagandha: A Rasayana rejuvenator of Ayurveda. African Journal of Traditional, Complementary and Alternative Medicines, 8(5 Suppl.), 208–213.
25. Prakash, P., & Gupta, N. (2005). Therapeutic uses of Ocimum sanctum Linn (Tulsi). Indian Journal of Physiology and Pharmacology, 49(2), 125–131.
26. Krishnaveni, M., & Mirunalini, S. (2010). Therapeutic potential of Phyllanthus emblica (Amla): The Ayurvedic wonder. Journal of Basic and Clinical Physiology and Pharmacology, 21(1), 93–105.
27. Srinivasan, K. (2007). Black pepper and its pungent principle-piperine: A review of diverse physiological effects. Critical Reviews in Food Science and Nutrition, 47(8), 735–748.
28. Ministry of AYUSH. (2023). Siddha treatment guidelines and medicinal plant database. Government of India.
