Novel Herbal Drug Delivery System: Emerging Trends and Technologies Towards Safer and more Effective Drug Delivery

Herbal treatments have been utilized in healthcare for thousands of years, and many plants have notable medicinal benefits. Despite the numerous therapeutic uses of herbal compounds, their clinical use has frequently been limited by pharmacokinetic issues, such as low solubility. Poor bioavailability, quick metabolism, and erratic absorption. These constraints may lead to less-than-ideal therapeutic consequences, making it challenging to attain the intended clinical results. Therefore, there is increasing interest in creating innovative drug delivery systems (DDS) that can meet these difficulties, especially those associated with herbal therapies. The goal of a novel herbal drug delivery system (NHDDS) is to increase the effectiveness of plant-based treatments making derived chemicals better by enhancing their stability, solubility, and regulated release, as well as allowing for targeted distribution to particular tissues or organs. The concept behind such a approach involves using cutting-edge technology, like hydrogels, dendrimers, liposomes, and nanoparticles, to encapsulate the active herbal components. These systems can shield the active molecules. Maximize their absorption, protect them from degradation, and guarantee a sustained release, all of which are essential for preserving therapeutic levels over time.[2]

Main Points of Emphasis:

a. Boosting Bioavailability: Improving the solubility and absorption of herbal substances.

b. Controlled Release: Creating mechanisms that provide a sustained drug release for lasting therapeutic benefit.

c. Targeted Delivery: creating methods to deliver herbal chemicals to particular tissues or organs, thereby enhancing their therapeutic index.

d. Safety and Biocompatibility: Making sure the systems are nontoxic and compatible with the body's natural processes.

e. Environmentally Friendly Formulations: Examining the application of natural and biodegradable substances in delivery systems.[3]

Herbal medicines require NDDS:

Multiple variables make unique drug delivery systems (NDDS) essential in herbal medicines. The goal of these systems is to improve the therapeutic efficacy, bioavailability, and safety of these organic products.

A. Increased Bioavailability

a.problem: The issue is that many plant substances have limited bioavailability because they are poorly soluble, poorly absorbed in the digestive system, or quickly metabolized in the liver.

b. Solution: Herbal substances can be encapsulated by NDDS, such as liposomes, nanoformulations, and micelles, which enhances their stability and solubility, ultimately resulting in increased absorption.

b. Targeted Delivery

Herbal medicines can have side effects because they frequently act on several bodily systems, and their distribution can be nonspecific.

Advanced delivery methods may target certain tissues or organs, increasing therapeutic outcomes while minimizing adverse effects.[4]

c. Continuous and Regulated Release

The issue with conventional herbal treatments is that they frequently have a quick release and a limited duration of effect, resulting in fluctuating plasma levels and diminished therapeutic outcomes.

Approach: Over a longer period of time, herbal medications can be administered in a regulated manner using NDDSs, such as hydrogels or polymeric microspheres, which maintain therapeutic levels.

d. Increased Stability

The effectiveness of several herbal substances may be reduced by hydrolysis, photodegradation, and oxidation.

Herbal medicines can be protected from environmental factors like light and oxygen by encapsulating them in protective materials using the NDDS method. For instance, polymeric or solid lipid nanoparticles can extend the shelf life of delicate herbal components by stabilizing them.

f. Lowered Adverse Effects and Toxicity

Due to their bad pharmacokinetics, certain herbal chemicals can have negative effects when taken in large doses or without adequate preparation.

The answer is that by lowering the systemic exposure to high concentrations, NDDS can enhance the pharmacokinetic profile of herbal medications, which in turn lowers toxicity and adverse effects. For instance, Herbal ingredients can be encased in biocompatible carriers to guarantee a slow and targeted release, which lowers the risk of toxicity.[5]

5. The biological and physicochemical characteristics of herbal medicines:

The physicochemical properties of herbal medicines are those of plant-derived compounds that influence their safety, efficacy, quality, and stability as therapeutic goods.

a. Attributes of Morphology:

The quality, identification, and consumer acceptance of the herb or its processed form (powder, extract, etc.) can be impacted by its shape, size, and color.

b. Moisture Content:

Because it impacts their shelf life, stability, and vulnerability to microbial development, the moisture level of herbal medicines is essential. Inadequate moisture might cause hard, brittle material, whereas too much moisture can cause deterioration.

c. Solubility:

The water solubility of many herbal medicinal bioactive chemicals, like alkaloids and flavonoids, varies. When ingested, the drug's solubility influences its bioavailability and absorption.

d. Polarity and Lipophilicity:

Lipophilic Compounds: Numerous active substances in herbs, such as essential oils, terpenes, and fatty acids, are lipophilic and may need oil-based solvents for extraction.

Polarity: key to overcoming challenges like poor water solubility, improving bioavailability, and achieving targeted delivery.[6]

5. Selecting an herbal remedy and an NDDS:

The selection of herbal therapies and their integration into Novel Drug Delivery Systems (NDDS) is a key area of research in modern herbal and pharmaceutical medicine. Many herbal medicines suffer from problems such poor solubility and variable absorption; this approach aims to increase their bioavailability, stability, and efficacy. It also decomposes fast in the body. The use of NDDS provides a means of improving these characteristics, which in the end leads to better therapeutic outcomes.

Pharmacological Consequences:

The herbal remedy must have a proven therapeutic effect. Withania somnifera (ashwagandha) and Curcuma longa (turmeric) are two popular examples.

Bioavailability issues include:

Many herbal remedies have restricted bioavailability because they are either poorly soluble or unstable in the digestive system. NDDS may improve the solubility of these chemicals, leading to better absorption and efficacy. For instance, curcumin, which comes from turmeric, has low oral bioavailability, making it a great candidate for NDDS enhancement.

Safety and Toxicity:

It's essential to select herbal treatments that are widely regarded as safe and have minimal toxicity profiles. Standardized extracts, which deliver consistent amounts of active ingredients, can also help lower safety risks.

Mode of Administration:

Herbal treatments can be given orally, topically, or parenterally. The NDDS is selected depending on the preferred method of administration. Herbal remedies may be incorporated into transdermal systems for topical administration, and solubility-enhancing systems (such as nanoformulations) can be used for oral delivery.[7]

5. Creative Drug Delivery Systems (NDDS) for Herbal Medicines

NDDS are designed to overcome the limitations of conventional medication delivery systems by controlling the rate of release, increasing the solubility of the drug, and ensuring targeted delivery. Some of the NDDS techniques often utilized to increase the potency of herbal treatments are listed below:

a. Systems Based on Nanotechnology:

a) Nanoparticles: Active herbal constituents can be encapsulated in nanoparticles, such as liposomes, solid lipid nanoparticles, and poly(lactic-co-glycolic acid) (PLGA) nanoparticles, which enhances their solubility, stability, and bioavailability. For example, curcumin-loaded nanoparticles significantly improve the oral bioavailability of curcumin.

b) Nanosuspensions: These are colloidal dispersions of minute herbal drug particles that enhance the solubility of drugs with low water solubility. This is beneficial for plant ingredients like resveratrol, quercetin, and curcumin.

b. Hydrogels and Polymers:

a) Hydrogels: These 3D networks are made of hydrophilic polymers that have a high capacity for       water retention. They can be used in herbal medicine compositions for sustained release. For instance, hydrogels loaded with Calendula officinalis extract or Aloe vera might provide sustained therapeutic benefits for wound treatment.

b) Polymeric Micelles: These micelles can solubilize hydrophobic herbal medicines in water since they are composed of amphiphilic block copolymers. They are able to increase the bioavailability of resveratrol and curcumin, two compounds that are not particularly soluble.[8]

c. Systems for regulated and sustained release:

a) Matrix Tablets: These tablets are designed to release herbal remedies gradually over time, which helps maintain a steady therapeutic concentration of the medicine in the bloodstream. For example, Ashwagandha or ginseng might be turned into extended-release formulations to guarantee consistent results.

b) Nanocapsules: These have a core-shell design that can be used to encapsulate herbal medications, allowing for controlled release. By changing the outer shell, the herbal remedy inside the nanocapsules can be released in specific conditions, such as the acidic stomach or the alkaline intestine.[8]

d. Transdermal Systems:

a) Transdermal Patches: Herbal remedies such Capsicum or Mentha can be administered via the skin in a controlled manner using patches. Particularly beneficial for herbal treatments that alleviate pain and swelling, this method is.

b) Microneedles: These very small needles are able to deliver herbal remedies like Cannabis or CBD straight into the bloodstream by bypassing first-pass metabolism.

f. Methods of Targeted Drug Delivery:

a) Targeted liposomes: Liposomes can be functionalized with ligands, such antibodies or specific peptides, that target specific cells or tissues. Herbal compounds like ginseng, for example, can be targeted toward certain organs, like the liver or brain, to boost their therapeutic benefits.

b) Polymeric Nanoparticles with Targeting Ligands: To deliver herbal medicines to the, polymeric nanoparticles can be decorated with targeting ligands. The site of action, such as targeting cancer cells for a more localized impact, uses turmeric orginger for cancer treatment.

The advantages of herbal therapy

1. Increased Bioavailability
2. Controlled and sustained release
3. Targeted medication delivery
4. Greater Stability
5. Improved Patient Compliance
6. Reduced Metabolism During the First Pass

The drawbacks of herbal remedies include:

5. No Standards.
5. Not Enough Clinical Information.
5. Problems with Safety
5. Issues with Quality Control and Regulation
5. The interplay between herbs and drugs
5. Questions Pertaining to the Environment and Sustainability
5. Common Misunderstandings Among Consumers [9].

5. Key Challenges in Modernization of Herbal Formulations

• Raw Material Quality & Standardization

Genetic / Species Variation: Even within the same “plant” species, there may be subspecies, chemotypes, or genetic variability that influence active compound content.

Growing Conditions & Harvesting: Soil, climate, altitude, time of harvest, season, maturity stage affect phytochemical profile.

Adulteration & Misidentification: Wrong species (plant), substitution, mix?ups; intentional or accidental adulteration (e.g. other plant parts, fillers, low quality raw material).

Contamination: Heavy metals, pesticide residues, microbial or fungal contamination, mycotoxins.

Post?harvest handling, storage, transport: Degradation of active compounds, moisture, light, etc.

• Analytical & Science?Based Validation

Marker?based Standards / Fingerprinting: Identifying reliable, relevant chemical markers; developing methods (chromatographic, spectroscopic, etc.) to measure them. Many herbs lack such standardized markers.

Complexity of Herbal Mixtures: Multiple constituents, with possible synergistic effects. It is harder to attribute efficacy to one compound; difficult to establish dose?response relationships.

Pharmacokinetics / ADME: Absorption, distribution, metabolism, excretion of herbal compounds often poorly understood; interactions among compounds; interactions with conventional drugs.

Efficacy, Safety and Clinical Trials: Well?designed clinical trials (randomized, double blind etc.) are costly; it is challenging to standardize the formulation used in trial to what will be marketed; placebo controls; long term safety data; adverse interactions; toxicological studies.[10]

• Regulation & Harmonization

Inconsistent Regulatory Standards: Different countries have varying requirements for herbal medicines vs. pharmaceuticals, or classify them differently (supplements, traditional medicines, etc.). Harmonization is limited.

Implementation & Enforcement: Even where regulations exist (e.g. Good Manufacturing Practices (GMP), Good Agricultural & Collection Practices (GACP)), their awareness, adoption, and enforcement are variable.

Registration / Approval Process: Dossier requirements, timelines, licensing can be inconsistent and burdensome. Export approvals face additional layers of complexity.

• Formulation / Manufacturing Challenges

Stability, Shelf?life: Many herbal products degrade over time; sensitive to light, heat, humidity; loss of potency.

Bioavailability: Many herbal actives are poorly soluble or poorly absorbed in their natural form. Enhancing delivery (e.g. nano?formulations, encapsulation, phytosomes, etc.) adds cost and technical complexity.

Scale?up: Moving from small laboratory/traditional batches to industrial scale: reproducibility, maintaining consistency, scalability of novel delivery systems.

Cost of Modern Technologies: Sophisticated analytical instrumentation, modern extraction/delivery technologies, R&D for clinical trials demand investment. Smaller manufacturers may find this prohibitive.

• Intellectual Property, Traditional Knowledge & Ethical Issues

1. Protecting and recognizing traditional knowledge; biopiracy; benefit sharing; ensuring communities whose knowledge is used are credited/rewarded.
2. Difficulties in patenting complex natural mixtures; many components may not be new, or are in public domain.
3. Sustainability & Environmental Concerns
4. Overharvesting of wild medicinal plants; loss of biodiversity.
5. Unsustainable cultivation practices: soil degradation, water usage, pesticide use, etc.
6. Marketing & Branding Challenges: distinguishing quality products; regulatory compliance may limit claims; competition from cheaper, less regulated/herbal products.
7. Limited infrastructure: labs capable of advanced analysis; stability testing; clinical trial sites.
8. Funding and incentives: R&D funding is often limited; return on investment uncertain.[11]

5. Novel herbal formulation currently available in market

Table referred from (Advances in Novel Phytopharmaceuticals Edited by Durgesh Nandini Chauhan, Madhu Gupta, Vikas Sharma, Nagendra Singh Chauhan) [12]

5. Introduction:

 Nanomedicine uses nanoscale materials to improve medical treatments, diagnostics, and monitoring. A key application within this field is the development of novel drug delivery systems (DDS), which are engineered to carry therapeutic agents precisely to target sites. This approach can increase drug efficacy, reduce systemic side effects, and overcome biological barriers. Nanomedicine DDS can be broadly categorized by their composition and structure. Lipid-based nanocarriers,Polymeric nanocarriers,Biological nanocarriers

• Neosomes

Niosomes are microscopic lamellar structures formed by non-ionic surfactants and cholesterol. They exhibit a bilayer structure, with hydrophilic ends facing outward and hydrophobic ends facing inward. Their unique structure makes them ideal for diverse applications, notably in drug delivery systems. Niosomes excel in encapsulating both hydrophilic and hydrophobic drugs, enhancing drug stability and bioavailability. They are adaptable for tailored drug release and have garnered interest across pharmaceuticals, cosmetics, and agriculture for their biocompatibility and versatile properties.

???? Physicochemical Properties:

1. Surfactant-based vesicles
2. Biodegradable and non-toxic
3. Size: 100 nm to a few microns
4. High entrapment efficiency

?? Method of Preparation:

1. Thin film hydration
2. Ether injection method
3. Reverse phase evaporation

???? Advantages:

1. Cost-effective alternative to liposomes
2. Chemical stability
3. Better shelf life

?? Disadvantages:

1. Less biocompatible than liposomes
2. Possible drug leakage
3. Scale-up challenges[13]

• Phytosomes

Phytosomes are complexes of herbal extracts and phospholipids. They improve the absorption and bioavailability of poorly soluble herbal compounds like flavonoids and terpenoids.

????Physicochemical Properties:

1. Amphiphilic in nature (hydrophilic + lipophilic)
2. Better lipid solubility than plain extract
3. Enhanced membrane permeability
4. Stable complex with improved dissolution

?? Method of Preparation:

1. Mixing standardized herbal extract with phospholipids in an organic solvent (like ethanol).
2. Evaporating solvent to get a thin film.
3. Hydration of the film → forms phytosomal complex.

???? Advantages:

1. Enhanced oral absorption and bioavailability
2. Better therapeutic effect at lower doses Easy to formulate in capsules or tablets.

?? Disadvantages:

1. Costlier than conventional extract
2. Requires specialized equipmentLimited stability if not stored properly.[14]

5. Introduction of herbal excipients

Herbal excipients are natural substances derived from plants that are used in pharmaceutical formulations not for their therapeutic action, but to aid in the formulation, stability, delivery, or administration of the active pharmaceutical ingredients (APIs).Excipients are vital non-active ingredients in drug formulations, playing a significant role in achieving stability, bioavailability, and ease of administration. They are traditionally synthetic or semi-synthetic in nature. The use of herbal excipients derived from natural plant sources has been stimulated in recent years. Interests have shown an upsurge, driven by concerns over safety, biocompatibility, and environmental sustainability of synthetic excipients. The pharmaceutical industry's demand for more natural and green formulations also contributes to this trend.