Gut Microbial Modulation Through Siddha Herbal Medicines
Keywords:
Siddha Medicine, Gut Microbiota, Gut Microbiome, Microbial Modulation, Medicinal Plants, Prebiotics; Phytochemicals, Intestinal Health, Dysbiosis, Immunomodulation, Integrative Medicine.Abstract
Background: The human gut microbiota plays a crucial role in maintaining gastrointestinal health, immune function, metabolic regulation, and overall physiological homeostasis. Alterations in the composition and diversity of gut microbial communities, commonly known as dysbiosis, have been associated with a wide range of chronic diseases including inflammatory bowel disease, obesity, diabetes mellitus, cardiovascular disorders, and neurodegenerative conditions. Siddha medicine, one of the oldest traditional systems of medicine practiced in South India, utilizes numerous medicinal plants and herbal formulations that possess antimicrobial, prebiotic, antioxidant, anti-inflammatory, and immunomodulatory properties. Recent scientific investigations suggest that these herbal medicines may influence gut microbial composition and function, thereby contributing to health promotion and disease prevention.
Objective: This review aims to evaluate the role of Siddha herbal medicines in modulating gut microbiota and to examine their potential applications in maintaining gastrointestinal and systemic health.
Methods: A comprehensive literature review was conducted using scientific databases including PubMed, Scopus, Web of Science, Google Scholar, ScienceDirect, and AYUSH research resources. Relevant studies published between 2000 and 2025 focusing on Siddha medicinal plants, gut microbiota, phytochemicals, microbial modulation, and microbiome-associated health outcomes were systematically analyzed. Information regarding medicinal plants, bioactive compounds, mechanisms of action, and therapeutic applications was extracted and synthesized.
Results: The reviewed literature revealed that several Siddha medicinal plants, including Phyllanthus emblica, Terminalia chebula, Terminalia bellirica, Curcuma longa, Ocimum tenuiflorum, Tinospora cordifolia, and Azadirachta indica, possess significant microbiome-modulating properties. These plants contain bioactive phytochemicals such as polyphenols, flavonoids, tannins, alkaloids, terpenoids, and polysaccharides that promote the growth of beneficial microorganisms including Lactobacillus and Bifidobacterium species while suppressing pathogenic microbes. The findings further demonstrated that Siddha herbal medicines enhance short-chain fatty acid production, improve intestinal barrier integrity, reduce inflammation and oxidative stress, and support immune homeostasis. Their antimicrobial and prebiotic activities contribute to the restoration of microbial balance and may help prevent gut dysbiosis associated with various chronic diseases.
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