Natural Polymer-Based Polyherbal Hydrogels

Abstract

Hydrogels made with two or more plant extracts, known as polyherbal hydrogels, have drawn interest for their potential use in antimicrobial and wound-healing applications, etc. Hydrogels containing various herbal extracts and natural polymers (such as chitosan, xanthan gum, guar gum, alginate, and pectin) are compiled in this review. A xanthan gum hydrogel containing extracts of Calendula officinalis and Hibiscus rosa-sinensis that markedly increased fibroblast/keratinocyte proliferation in vitro and mouse wound closure. In general, these polyherbal gels demonstrated good biocompatibility (MTT assays showed no cytotoxicity and even increased cell proliferation), and in certain instances, they displayed sustained drug-release profiles that frequently fit Higuchi kinetics. Polyherbal hydrogels made from natural polymers exhibit strong antimicrobial, antioxidant, and wound-healing activities due to the synergistic action of multiple plant extracts. They enhance Herbal medicines are widely used in topical formulations due to their safety, biocompatibility, and multiple pharmacological activities. Polyherbal hydrogel can provide analgesic, anti-inflammatory, antiseptic, antioxidant, and antimicrobial effects with minimal side effects. Around 1-4% of people in the world suffer from arthritis. Rheumatoid arthritis is an autoimmune disease. Commonly treatment includes steroidal, non-steroidal anti-inflammatory, disease-modifying, antirheumatic and immunosuppressive medications. Ayurvedic and Siddha medicine have been recognised as alternative treatments for arthritis. Medicinal plants like turmeric, ginger, cinnamon, aloe vera, and tulsi contain bioactive phytoconstituents that promote tissue repair. Conventional synthetic wound-healing agents often present limitations such as side effects. Hydrogels, owing to their high water content, biocompatibility, and soothing properties, are ideal for wound management. The hydrogel is formulated with guar gum (gelling agent) and glycerine (humectant) to enhance consistency and hydration and enriched with curcumin, ginger, cinnamon, aloe vera, tulsi, and other extracts for their therapeutic benefits. The hydrogel exhibited desirable physicochemical characteristics, including smooth texture, optimal viscosity, good spreadability and stability, making it suitable for topical use. Tests for colour, appearance, pH, texture, viscosity, and skin irritation were performed. This review presents an overview of natural-polymer-based polyherbal hydrogels, including the basics of hydrogels, characteristics of natural polymers, rationale for polyherbal formulations, formulation strategies, parameters of evaluation, biological activities, applications, advantages, limitations, and future scope. Major natural polymers, including chitosan, sodium alginate, Gelatine, hyaluronic acid, guar gum, pectin, xanthan gum, and cellulose derivatives, are discussed along with their crosslinking mechanisms and physicochemical properties.

Introduction

Hydrogels are three-dimensional hydrophilic polymer networks capable of absorbing large amounts of water while maintaining structural stability. They are widely used in pharmaceutical, biomedical, cosmetic, wound-care, and tissue-engineering applications. Natural polymers such as chitosan, alginate, gelatin, hyaluronic acid, pectin, guar gum, xanthan gum, and cellulose derivatives are preferred because of their biodegradability, biocompatibility, non-toxicity, and easy modification.

Polyherbal hydrogels combine the therapeutic benefits of multiple herbal extracts with the functional advantages of hydrogel systems. Herbal components containing flavonoids, tannins, alkaloids, terpenoids, and phenolic compounds provide antimicrobial, antioxidant, anti-inflammatory, and wound-healing effects. When incorporated into natural polymer matrices, they offer improved stability, controlled release, enhanced penetration, and targeted therapeutic action.

These hydrogels are especially beneficial in wound healing by maintaining a moist environment, promoting collagen formation, supporting tissue regeneration, reducing infection, and accelerating wound closure. Herbal extracts such as Aloe vera, neem, turmeric, calendula, and Centella asiatica enhance healing through antioxidant and anti-inflammatory mechanisms. Natural polymers further improve performance; for example, chitosan provides antimicrobial and haemostatic properties, alginate absorbs wound fluid, and hyaluronic acid supports tissue repair.

The major types of natural polymers used in polyherbal hydrogels include:

• Chitosan: Biodegradable, antimicrobial, mucoadhesive, and wound-healing supportive.
• Sodium alginate: Forms stable gels through ionic crosslinking and provides moisture control.
• Gelatin: Provides excellent film-forming and tissue-compatible properties.
• Hyaluronic acid: Enhances hydration and tissue regeneration.
• Pectin, guar gum, xanthan gum, and cellulose derivatives: Improve viscosity, stability, and bioadhesion.

The formulation process involves selecting suitable polymers, extracting herbal compounds, preparing polymer dispersions, incorporating herbal extracts, adjusting pH, adding crosslinking agents, and optimizing properties such as viscosity and spreadability. Evaluation of these hydrogels includes physicochemical testing (pH, viscosity, appearance, spreadability), phytochemical analysis, structural studies (FTIR, SEM, rheology), antimicrobial and antioxidant testing, wound-healing studies, and stability evaluation.

Polyherbal hydrogels have wide applications including:

• Wound healing and tissue regeneration: Improve epithelialization, collagen formation, and wound closure.
• Antimicrobial therapy: Provide antibacterial and antifungal effects for infected wounds and skin disorders.
• Anti-inflammatory treatment: Reduce inflammation in conditions like dermatitis, eczema, and psoriasis.
• Burn wound management: Provide cooling, hydration, infection control, and protection.
• Cosmetic applications: Used in anti-aging, anti-acne, skin hydration, and skin-repair products.
• Transdermal drug delivery: Enable sustained and controlled release of herbal compounds.
• Chronic wound therapy: Support treatment of diabetic ulcers and long-term wounds.
• Mucosal, veterinary, and agricultural applications: Provide potential uses beyond human medicine.

Advantages of polyherbal hydrogels include synergistic therapeutic effects, biocompatibility, controlled drug release, moisture retention, enhanced skin absorption, cooling sensation, non-greasy texture, localized drug delivery, formulation flexibility, and environmental sustainability.

However, limitations include variability in herbal extract composition, stability problems, difficulty in standardization, possible polymer–extract interactions, and inconsistent skin penetration. Long-term clinical validation and regulatory approval remain important challenges.

Future developments focus on smart stimuli-responsive hydrogels, nanotechnology-based herbal delivery systems, improved standardization methods, advanced characterization techniques, clinical studies, biodegradable packaging, and large-scale industrial production.

Conclusion

According to the reviewed research, polyherbal hydrogels with natural polymer backbones can have a variety of advantageous effects. Chitosan, xanthan gum, and guar gum are examples of natural polymers that offer a moist, biocompatible matrix that promotes tissue regeneration and cell adhesion. Natural polymer–based polyherbal hydrogels represent an emerging, effective, and safe approach for topical drug delivery and wound management. Their ability to integrate the strengths of both natural polymers and medicinal plant extracts makes them ideal candidates for biomedical and pharmaceutical applications. Recent research supports their promising potential in antimicrobial therapy, wound healing, anti-inflammatory treatment, and skin care. According to the studies, multi-extract gels frequently perform better than single-herb or single-polymer systems. Swellable, absorbing wound exudate before gradually releasing water and active ingredients. The synergy of natural polymers with polyherbal extracts leads to enhanced therapeutic effects, sustained drug release, improved patient compliance, and minimal side effects. Although challenges remain in standardization, stability, and large-scale production, the future of polyherbal hydrogels is bright, with significant opportunities for innovation, commercialization, and clinical application. Polyherbal hydrogels derived from natural polymers have shown promise as therapeutic gels and wound dressings. Strong pathogen inhibition, improved collagen formation and cell proliferation in wounds, and good biocompatibility are some of the main benefits. All things considered, the mounting data points to the synergistic benefits of incorporating several plant extracts into natural polymer hydrogels for wound treatment. Future research should keep improving polymer–herb combinations, measuring release kinetics, and confirming effectiveness in models that are pertinent to clinical settings.

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Copyright © 2026 Ranjit Kavthe, Nikita Kharat, Kishori Hol. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.