Formulation and Evaluation of Multipurpose Herbal Liquid Shampoo

Herbal cosmetics have been extensively used since ancient times for maintaining hair hygiene, promoting hair growth, and preventing scalp disorders. Traditional medicinal systems such as Ayurveda, Siddha, and Unani have described numerous herbal ingredients possessing beneficial effects on hair and scalp health. In recent years, scientific research has increasingly focused on the development of herbal shampoos due to their improved safety profile, minimal side effects, and natural origin.

Researchers have reported that herbal shampoos are capable of providing cleansing action along with additional therapeutic benefits such as anti-dandruff activity, scalp nourishment, hair conditioning, and reduction of hair fall. Unlike synthetic shampoos, herbal formulations are less likely to damage hair proteins or disturb the natural oil balance of the scalp. The growing preference for herbal personal care products has significantly increased research interest in the formulation of plant-based shampoos.

Amla (Emblica officinalis) is one of the most commonly used herbal ingredients in hair care formulations. Various studies have demonstrated that amla possesses antioxidant, antimicrobial, and hair strengthening properties. The presence of vitamin C, tannins, and polyphenolic compounds contributes to scalp protection and reduction of dandruff. Amla is also traditionally used for improving hair pigmentation and preventing premature greying of hair.

Fenugreek (Trigonella foenum-graecum) has been widely investigated for its beneficial effects on hair health. Researchers have reported that fenugreek seeds contain proteins, nicotinic acid, lecithin, and mucilage which help in strengthening hair roots and reducing hair breakage. Fenugreek extract also exhibits conditioning properties that improve softness and manageability of hair. Several herbal cosmetic preparations incorporate fenugreek as a natural anti-hair fall agent.

Hibiscus (Hibiscus rosa-sinensis) is another important medicinal plant commonly used in herbal shampoos and hair oils. Scientific studies suggest that hibiscus extract promotes hair growth, improves hair thickness, and provides conditioning effects. The presence of flavonoids, amino acids, and mucilage contributes to nourishment of hair follicles and enhancement of hair shine. Hibiscus is also considered beneficial in reducing scalp irritation and dryness.

Flaxseed (Linum usitatissimum) has gained attention in cosmetic formulations due to its moisturizing and conditioning properties. Flaxseed contains omega-3 fatty acids, proteins, mucilage, and antioxidants that help in maintaining scalp hydration and preventing hair dryness. Herbal hair care products containing flaxseed are reported to improve smoothness and elasticity of hair fibers.

Horse gram (Macrotyloma uniflorum) has traditionally been used in various herbal preparations due to its rich nutritional profile. It contains proteins, iron, calcium, antioxidants, and polyphenolic compounds that may help in nourishing the scalp and supporting healthy hair growth. Although limited studies are available specifically related to shampoo formulations, horse gram extract has shown potential as a natural hair strengthening agent.

Lemon juice has been commonly incorporated into herbal shampoos for maintaining acidic pH and controlling excess oil secretion from the scalp. Acidic pH is considered essential for maintaining hair cuticle integrity and reducing scalp irritation. Rose water is frequently used in cosmetic formulations because of its soothing, cooling, and fragrance-enhancing properties. It also improves consumer acceptability of herbal cosmetic products.

Modern herbal shampoos often utilize mild surfactants such as coco glucoside instead of harsh synthetic detergents. Coco glucoside is a non-ionic surfactant derived from coconut oil and glucose. It is biodegradable, gentle on the skin, and capable of producing satisfactory cleansing and foaming action. Due to its mild nature, it is commonly used in herbal and sensitive skin formulations.

Several investigators have emphasized the importance of evaluation parameters in determining the quality and acceptability of herbal shampoos. Parameters such as pH, viscosity, foamability, solid content, wetting ability, cleansing efficiency, skin irritation, and stability studies are considered essential for ensuring formulation performance and safety. Stability testing is particularly important to evaluate physical appearance, phase separation, colour changes, odour retention, and microbial stability during storage.

Recent research trends indicate increasing demand for multipurpose herbal shampoos capable of providing cleansing, conditioning, scalp protection, anti-dandruff activity, and hair nourishment simultaneously. Consumers are becoming more inclined toward herbal products that are economical, environmentally friendly, and free from harmful synthetic chemicals. Therefore, the development of scientifically validated herbal liquid shampoos represents an important area of research in pharmaceutical and cosmetic sciences.

3. AIM AND OBJECTIVES

3.1 Aim

The main aim of the present research work was to formulate and evaluate a multipurpose herbal liquid shampoo using natural herbal extracts possessing cleansing, nourishing, conditioning, anti-dandruff, and hair strengthening properties. The study was designed to develop a safe, stable, effective, and eco-friendly herbal shampoo formulation that may serve as an alternative to synthetic cosmetic shampoos.[6]

3.2 Objectives

The major objectives of the present study were as follows:

1. To formulate a herbal liquid shampoo

To prepare a multipurpose herbal liquid shampoo using Horse Gram extract, Amla extract, Fenugreek extract, Hibiscus extract, and Flaxseed extract along with suitable excipients and additives.[7]

2. To utilize natural herbal ingredients for hair care

To incorporate herbal ingredients possessing medicinal and cosmetic benefits such as hair growth promotion, scalp nourishment, conditioning, anti-dandruff activity, and moisturizing effects.[8]

3. To reduce the use of synthetic chemicals

To develop a herbal cosmetic formulation containing minimal synthetic ingredients in order to reduce scalp irritation, dryness, and harmful side effects commonly associated with conventional shampoos.[9]

4. To evaluate physicochemical properties of the formulation

To evaluate the prepared shampoo for various parameters including colour, odour, appearance, pH, texture, foamability, solid content, cleansing action, and skin irritation.[10]

5. To determine the stability of the formulation

To perform stability studies in order to assess the physical stability, appearance, odour retention, and overall acceptability of the shampoo during storage conditions.[11]

6. To prepare a safe and user-friendly formulation

To formulate a shampoo with acceptable consistency, pleasant fragrance, easy applicability, and good consumer compliance suitable for routine hair care applications.

7. To promote herbal cosmetic research

To encourage the use of medicinal plants and herbal ingredients in cosmetic and pharmaceutical formulations for safer and sustainable personal care products.[12]

4. MATERIALS AND METHODS

4.1 Materials

The herbal liquid shampoo was prepared using various herbal extracts, natural additives, surfactants, preservatives, and purified water. All the ingredients used in the formulation were selected based on their therapeutic and cosmetic importance in hair care preparations. The materials used in the study are listed below.

4.2 List of Materials Used

Table 4.1: Ingredients Used in the Formulation of Multipurpose Herbal Liquid Shampoo

4.3 Role of Ingredients in Herbal Liquid Shampoo

4.3.1 Horse Gram Extract

Horse gram extract was used as the major herbal ingredient in the formulation due to its rich nutritional composition containing proteins, iron, antioxidants, and polyphenols. It helps in strengthening hair roots, nourishing hair follicles, and promoting healthy hair growth. The antioxidant properties also assist in protecting the scalp from oxidative damage.[13]

4.3.2 Amla Extract

Amla extract is widely used in herbal hair care preparations because of its high vitamin C content and antioxidant activity. It helps in reducing dandruff, improving scalp health, strengthening hair roots, and preventing premature greying of hair. Amla also enhances hair texture and natural shine.[14]

4.3.3 Fenugreek Extract

Fenugreek extract contains proteins, lecithin, mucilage, and nicotinic acid which are beneficial for reducing hair fall and strengthening hair fibers. It also acts as a natural conditioner and improves softness and manageability of hair.[15]

4.3.4 Hibiscus Extract

Hibiscus extract is known for its conditioning and hair nourishing properties. It supports healthy hair growth, improves hair thickness, and enhances natural shine. The mucilage present in hibiscus also contributes to smoothness and softness of hair.[16]

4.3.5 Flaxseed Extract

Flaxseed extract acts as a natural moisturizing and conditioning agent due to the presence of omega fatty acids and mucilage. It helps in preventing dryness, improving scalp hydration, and maintaining smooth texture of hair.[17]

4.3.6 Lemon Juice

Lemon juice was incorporated to maintain the acidic pH of the shampoo formulation. Proper pH is essential for scalp compatibility, prevention of scalp irritation, and maintenance of hair cuticle integrity. Lemon juice also contributes mild cleansing and anti-dandruff activity.[18]

4.3.7 Rose Water with Fragrance

Rose water containing fragrance was used to provide a soothing effect and pleasant aroma to the shampoo. It improves consumer acceptability and provides refreshing sensation during application. Rose water also exhibits mild cooling and calming effects on the scalp.

4.3.8 Coco Glucoside

Coco glucoside is a mild non-ionic surfactant derived from natural sources such as coconut oil and glucose. It was used as a cleansing and foaming agent in the formulation. It produces gentle foam without causing excessive dryness or irritation to the scalp.[19]

4.3.9 Benzyl Alcohol

Benzyl alcohol was used as a preservative to prevent microbial contamination and improve the shelf life of the herbal shampoo formulation. It helps in maintaining formulation stability during storage.[20]

4.4 Method of Preparation of Multipurpose Herbal Liquid Shampoo

The multipurpose herbal liquid shampoo was prepared by simple mixing and blending method under controlled laboratory conditions.

Step 1: Preparation of Herbal Base

Measured quantities of Horse Gram extract, Amla extract, Fenugreek extract, Hibiscus extract, and Flaxseed extract were taken in a clean beaker and mixed thoroughly using a magnetic stirrer to obtain a uniform herbal base.[21]

Step 2: Addition of Surfactant

Coco glucoside was added slowly to the herbal mixture with continuous stirring to ensure proper mixing and avoid excessive foam formation.

Step 3: Addition of Preservative

Benzyl alcohol was incorporated into the formulation as a preservative with continuous stirring to maintain uniformity.

Step 4: Adjustment of pH and Fragrance

Lemon juice was added in suitable quantity for pH adjustment, and rose water containing fragrance was incorporated to improve aroma and soothing properties of the formulation.

Step 5: Volume Adjustment

Finally, purified water was added to make the final volume up to 100 mL. The formulation was stirred continuously until a homogeneous liquid shampoo was obtained.

Step 6: Storage of Formulation

The prepared herbal liquid shampoo was transferred into clean airtight containers, properly labeled, and stored at room temperature for further evaluation studies.

5. PREFORMULATION STUDIES

Preformulation studies are important preliminary investigations carried out before the development of any pharmaceutical or cosmetic formulation. These studies help in understanding the physical, chemical, and compatibility characteristics of ingredients used in the formulation. Proper preformulation evaluation ensures stability, safety, effectiveness, and quality of the final product.[22]

In the present research work, preformulation studies were performed for the selected herbal ingredients and excipients used in the preparation of multipurpose herbal liquid shampoo. The studies mainly included organoleptic evaluation, solubility characteristics, compatibility studies, pH determination, and evaluation of physical appearance.

Fig: Herbal Ingredients Used in Multipurpose Shampoo Formulation

5.1 Organoleptic Evaluation of Herbal Ingredients

Organoleptic evaluation involves examination of ingredients based on sensory characteristics such as colour, odour, appearance, and texture. These parameters are important for maintaining consistency and acceptability of cosmetic formulations.

Table 5.1: Organoleptic Characteristics of Herbal Ingredients

The organoleptic properties of all ingredients were found to be suitable for preparation of herbal shampoo formulation. No undesirable odour or abnormal appearance was observed.[23]

5.2 Solubility Study

Solubility study was performed to determine the miscibility and dispersion behavior of herbal extracts and excipients in water. Proper solubility is essential for obtaining a homogeneous and stable liquid shampoo formulation.

Observation:

• Herbal extracts showed good dispersion in water.
• Coco glucoside was completely miscible in aqueous medium.
• Rose water mixed uniformly with the formulation.
• No phase separation or precipitation was observed during mixing process.

The results indicated that all ingredients were compatible with the aqueous base and suitable for liquid shampoo preparation.[24]

5.3 Compatibility Study

Compatibility study was carried out to evaluate possible interactions among herbal extracts and formulation additives. Incompatible ingredients may lead to instability, precipitation, colour changes, or degradation of active constituents.

Observation:

• No visible incompatibility was observed among herbal ingredients.
• No precipitation or coagulation occurred after mixing.
• The formulation remained physically stable during preparation.
• No undesirable colour change or foul odour developed.

These findings indicated satisfactory compatibility among all selected ingredients used in the herbal shampoo formulation.[25]

5.4 pH Determination of Herbal Base

The pH of the herbal base was determined because pH plays a significant role in maintaining scalp health and hair compatibility. Acidic pH helps in reducing scalp irritation and maintaining hair cuticle integrity.

The pH of the prepared herbal shampoo formulation was adjusted using lemon juice and was found to be approximately 5, which is considered suitable for scalp and hair applications.[26]

5.5 Selection of Surfactant

Selection of suitable surfactant is one of the most important aspects in shampoo formulation. The surfactant should provide adequate cleansing action without causing excessive dryness or irritation.

Coco glucoside was selected as the surfactant because:

• It is a mild non-ionic surfactant.
• It is biodegradable and eco-friendly.
• It produces gentle foam.
• It is suitable for sensitive scalp conditions.
• It causes less irritation compared to synthetic detergents.[27]

5.6 Selection of Preservative

Herbal formulations are more susceptible to microbial contamination due to the presence of natural ingredients and water content. Therefore, incorporation of preservative is essential to improve stability and shelf life.

Benzyl alcohol was selected as preservative because:

• It possesses antimicrobial activity.
• It is commonly used in cosmetic formulations.
• It improves microbial stability of aqueous preparations.
• It is effective in low concentrations.[28]

5.7 Conclusion of Preformulation Studies

The preformulation studies confirmed that all selected herbal ingredients and excipients were suitable for the preparation of multipurpose herbal liquid shampoo. The ingredients showed satisfactory compatibility, acceptable organoleptic characteristics, good aqueous miscibility, and stable physical appearance. The studies also confirmed that the selected formulation components were appropriate for developing a stable and effective herbal shampoo preparation.

6. FORMULATION OF HERBAL LIQUID SHAMPOO

Herbal liquid shampoo is a cosmetic preparation used for cleansing hair and scalp while simultaneously providing nourishment, conditioning, and protection against common hair problems. In the present study, a multipurpose herbal liquid shampoo was formulated using natural herbal extracts possessing hair growth promoting, moisturizing, anti-dandruff, and conditioning properties. The formulation was developed with the objective of preparing a safe, stable, and effective herbal cosmetic preparation with minimal use of synthetic ingredients.[29]

The formulation consisted of various medicinal plant extracts such as Horse Gram extract, Amla extract, Fenugreek extract, Hibiscus extract, and Flaxseed extract along with suitable additives including coco glucoside, benzyl alcohol, lemon juice, rose water with fragrance, and purified water.

6.1 Formula for Multipurpose Herbal Liquid Shampoo

Table 6.1: Formulation of Multipurpose Herbal Liquid Shampoo (100 mL)

6.2 Scientific Basis of Formulation

The formulation was designed by selecting herbal ingredients known for their beneficial effects on hair and scalp health. Each ingredient was incorporated based on its therapeutic and cosmetic properties.

• Horse Gram extract was used as the primary herbal base because of its nourishing and hair strengthening properties.
• Amla extract was incorporated for anti-dandruff and antioxidant activity.
• Fenugreek extract was used for reducing hair breakage and improving hair texture.
• Hibiscus extract provided conditioning and hair shining effects.
• Flaxseed extract acted as a moisturizing and smoothing agent.
• Lemon juice maintained the acidic pH required for scalp compatibility.
• Rose water with fragrance improved soothing effect and product acceptability.
• Coco glucoside provided mild cleansing and foaming action.
• Benzyl alcohol enhanced microbial stability and shelf life.[30]

6.3 Method of Formulation

The herbal liquid shampoo was prepared using simple blending and mixing technique under hygienic laboratory conditions.

Step 1: Preparation of Herbal Extract Mixture

Measured quantities of Horse Gram extract, Amla extract, Fenugreek extract, Hibiscus extract, and Flaxseed extract were transferred into a clean beaker. The extracts were mixed thoroughly using a magnetic stirrer until a uniform herbal mixture was obtained.[31]

Step 2: Addition of Surfactant

Coco glucoside was added slowly to the herbal mixture with continuous stirring. Slow addition was necessary to avoid excessive foam formation and ensure uniform dispersion throughout the formulation.

Step 3: Incorporation of Preservative

Benzyl alcohol was added to the formulation as a preservative. Continuous stirring was maintained to achieve complete mixing and uniform distribution.

Step 4: pH Adjustment and Fragrance Addition

Lemon juice was added in suitable quantity for maintaining scalp-friendly acidic pH. Rose water containing fragrance was incorporated to provide pleasant aroma and soothing effect to the final product.

Step 5: Volume Adjustment

Purified water was added gradually to make the final volume up to 100 mL. The entire mixture was stirred continuously until a homogeneous liquid shampoo formulation was obtained.

Step 6: Filtration and Storage

The prepared shampoo formulation was filtered if necessary to remove unwanted particles and transferred into clean airtight containers. The containers were labeled properly and stored at room temperature for further evaluation and stability studies.[32]

6.4 Advantages of the Prepared Herbal Shampoo

The formulated multipurpose herbal liquid shampoo offers several advantages compared to conventional synthetic shampoos:

• Contains natural herbal ingredients with minimal synthetic chemicals.
• Provides cleansing along with nourishment and conditioning.
• Helps in reducing hair fall and dandruff.
• Maintains scalp-friendly pH.
• Produces gentle cleansing without excessive dryness.
• Eco-friendly and biodegradable formulation.
• Less irritating to scalp and skin.
• Economical and suitable for routine use.[33]

6.5 Precautions During Formulation

Certain precautions were followed during preparation of the herbal shampoo to maintain formulation quality and stability:

• Clean and dry apparatus were used throughout the preparation.
• Continuous stirring was maintained for uniform mixing.
• Excessive foam generation was avoided during surfactant addition.
• Ingredients were added in measured quantities.
• pH was carefully adjusted using lemon juice.
• The formulation was stored in airtight containers to avoid contamination.
• Hygienic conditions were maintained during preparation process.[34]

6.6 Flow Chart of Herbal Liquid Shampoo Formulation

Collection of Herbal Extracts

↓
Mixing of Horse Gram, Amla, Fenugreek, Hibiscus, and Flaxseed Extracts
↓
Addition of Coco Glucoside
↓
Addition of Benzyl Alcohol
↓
Addition of Lemon Juice and Rose Water with Fragrance
↓
Volume Adjustment with Purified Water
↓
Continuous Stirring and Homogenization
↓
Filling into Containers
↓
Storage and Evaluation

7. EVALUATION PARAMETERS

Evaluation of herbal shampoo is essential to determine its quality, safety, stability, and performance characteristics. Various physicochemical and performance parameters are evaluated to ensure that the formulation is suitable for cosmetic application and acceptable to consumers. In the present study, the prepared multipurpose herbal liquid shampoo was evaluated for colour, odour, pH, texture, foamability, percentage solid content, appearance, cleansing action, skin irritation, and stability studies.[35]

7.1 Organoleptic Evaluation

Organoleptic evaluation involves visual and sensory examination of the formulation. Parameters such as colour, odour, appearance, and texture are important for consumer acceptability and aesthetic quality of the shampoo.

Observation

• Colour: Brownish
• Odour: Pleasant
• Appearance: Turbid
• Texture: Slightly Thick

The shampoo formulation showed acceptable organoleptic properties suitable for herbal cosmetic preparations.[36]

7.2 Determination of pH

The pH of shampoo is an important parameter because it affects scalp compatibility, hair texture, and irritation potential. Acidic pH is preferred as it helps maintain the natural condition of hair cuticle and reduces scalp irritation.

Procedure

A small quantity of shampoo was dissolved in distilled water and the pH was measured using a calibrated digital pH meter at room temperature.[37]

Result

The pH of the prepared herbal liquid shampoo was found to be:

pH = 5

The obtained pH indicated that the formulation was suitable for scalp and hair application.

7.3 Evaluation of Texture

Texture determines the consistency and spreadability of shampoo. Proper consistency ensures easy application and uniform distribution over hair and scalp.

Observation

The prepared shampoo exhibited slightly thick consistency, which was considered appropriate for liquid shampoo formulation.[38]

7.4 Foamability and Foam Type

Foam formation is one of the important quality parameters of shampoos because consumers generally associate foam with cleansing efficiency. Herbal shampoos usually produce moderate foam compared to synthetic shampoos due to the use of mild surfactants.

Procedure

A measured quantity of shampoo was mixed with water in a graduated cylinder and shaken vigorously. Foam formation and foam stability were observed.[39]

Result

The formulation produced:

Foam Type: Medium

The shampoo showed satisfactory foaming ability and stable foam formation.

7.5 Determination of Percentage Solid Content

Solid content indicates the concentration of active and inactive ingredients present in shampoo. Proper solid content is necessary to maintain consistency and ease of washing.

Procedure

A known quantity of shampoo was evaporated to dryness and the remaining residue was weighed. Percentage solid content was calculated.[40]

Result

Percentage Solid Content = 20.8%

The obtained value indicated acceptable consistency and spreadability of the formulation.

7.6 Evaluation of Appearance

Appearance evaluation is important for assessing physical uniformity and aesthetic quality of shampoo formulations.

Observation

The prepared shampoo appeared turbid due to the presence of multiple herbal extracts and natural constituents. No phase separation or precipitation was observed.[41]

7.7 Cleansing Action

Cleansing action determines the ability of shampoo to remove dirt, oil, and impurities from hair and scalp without causing excessive dryness.

Procedure

The shampoo was applied on oily hair strands followed by washing with water. Cleansing efficiency and hair feel after washing were observed.[42]

Result

The formulation exhibited:

Soft and Easy Cleansing Action

The shampoo effectively removed dirt and oil while maintaining softness of hair.

7.8 Skin Irritation Test

Skin irritation study is performed to evaluate the safety of cosmetic formulations for topical application.

Procedure

A small quantity of shampoo was applied on skin surface and observed for signs of redness, itching, irritation, or inflammation after a specific time interval.[43]

Result

No Irritation Observed

The formulation was found to be safe and non-irritating for topical use.

7.9 Stability Study

Stability studies are performed to determine the physical and chemical stability of the formulation during storage.

Procedure

The prepared shampoo was stored at room temperature and observed periodically for changes in colour, odour, texture, appearance, and phase separation.[44]

Result

Stable After 35 Days

No significant changes were observed during the study period, indicating good stability of the formulation.

7.10 Evaluation Results Table

Table 7.1: Evaluation Results of Herbal Liquid Shampoo

7.11 Significance of Evaluation Parameters

Evaluation parameters play a major role in determining the quality and performance of herbal shampoos. Proper pH prevents scalp irritation, adequate foamability improves cleansing efficiency, acceptable solid content ensures easy application, and stability studies confirm formulation reliability during storage. The obtained evaluation results indicated that the prepared multipurpose herbal liquid shampoo possessed satisfactory physicochemical properties and cosmetic acceptability suitable for routine hair care applications.[45]

8. STABILITY STUDIES

Stability study is an important part of pharmaceutical and cosmetic formulation development. It helps in determining the ability of a formulation to retain its physical appearance, chemical properties, performance characteristics, and microbial stability during storage. Herbal formulations are more susceptible to instability because they contain natural constituents that may undergo degradation, precipitation, colour change, microbial contamination, or phase separation over time. Therefore, stability evaluation is essential to ensure the quality, safety, and shelf life of herbal cosmetic products.[46]

In the present study, stability studies were carried out for the prepared multipurpose herbal liquid shampoo to evaluate its stability under storage conditions. The formulation was observed periodically for changes in colour, odour, texture, pH, appearance, foamability, and phase separation.

8.1 Objectives of Stability Study

The major objectives of the stability study were:

• To evaluate physical stability of the shampoo formulation.
• To determine changes in colour, odour, and appearance during storage.
• To observe any precipitation or phase separation.
• To assess retention of cleansing and foaming properties.
• To determine overall formulation acceptability after storage.[47]

8.2 Storage Conditions

The prepared herbal liquid shampoo was filled in clean airtight containers and stored under room temperature conditions for a period of 35 days.

Storage Condition:

• Temperature: Room Temperature
• Container: Airtight Container
• Duration: 35 Days

The formulation was examined at regular intervals throughout the storage period.[48]

8.3 Parameters Evaluated During Stability Study

The following parameters were evaluated during stability testing:

1. Colour

Observation of any colour fading, darkening, or undesirable colour change.

2. Odour

Examination of retention of pleasant fragrance and absence of foul smell.

3. Texture

Evaluation of consistency and viscosity changes during storage.

4. Appearance

Observation of clarity, turbidity, precipitation, or phase separation.

5. pH

Determination of any changes in pH affecting scalp compatibility.

6. Foamability

Assessment of foaming ability and foam stability after storage.[49]

8.4 Observations of Stability Study

During the study period, the herbal liquid shampoo formulation remained physically stable without significant changes in organoleptic or performance characteristics.

Observed Results:

• No significant colour change was observed.
• Pleasant odour was retained throughout the study period.
• Texture remained slightly thick and uniform.
• No precipitation or phase separation was observed.
• pH remained within acceptable range.
• Cleansing and foaming properties remained satisfactory.[50]

8.5 Stability Study Result

Stability Result:

Stable After 35 Days

The prepared herbal liquid shampoo showed satisfactory stability throughout the storage period and maintained acceptable physicochemical properties.

8.6 Importance of Stability Studies in Herbal Cosmetics

Stability studies are essential in herbal cosmetic formulations because natural ingredients may undergo degradation due to environmental conditions such as temperature, light, moisture, and microbial contamination. Stability evaluation helps in:

• Determining product shelf life.
• Maintaining formulation safety and effectiveness.
• Preventing microbial spoilage.
• Ensuring consumer acceptability.
• Improving commercial viability of herbal products.[51]

Proper preservation and suitable packaging are also important factors contributing to formulation stability.

8.7 Factors Affecting Stability of Herbal Shampoo

Several factors may influence the stability of herbal shampoo formulations:

• Nature and concentration of herbal extracts.
• pH of the formulation.
• Storage temperature.
• Exposure to light and moisture.
• Type of preservative used.
• Microbial contamination.
• Packaging material.[52]

In the present formulation, incorporation of benzyl alcohol as preservative and maintenance of acidic pH contributed significantly to formulation stability.

8.8 Conclusion of Stability Studies

The stability studies confirmed that the prepared multipurpose herbal liquid shampoo possessed satisfactory physical stability and maintained acceptable quality during the study period. The formulation remained stable without significant alteration in colour, odour, texture, pH, appearance, or cleansing performance. These findings indicate that the developed herbal shampoo formulation is suitable for cosmetic use and possesses good storage stability under normal conditions.[53]

9. RESULTS AND DISCUSSION

The present research work was carried out to formulate and evaluate a multipurpose herbal liquid shampoo using natural herbal extracts possessing cleansing, conditioning, moisturizing, anti-dandruff, and hair nourishing properties. The prepared formulation was evaluated for various physicochemical and performance parameters to determine its quality, stability, safety, and cosmetic acceptability. The obtained results indicated that the developed herbal shampoo possessed satisfactory characteristics suitable for routine hair care applications.[54]

9.1 Results of Herbal Liquid Shampoo

The prepared herbal shampoo was found to be physically stable and aesthetically acceptable. The formulation exhibited good consistency, pleasant odour, satisfactory cleansing action, and suitable pH for scalp compatibility.

Table 9.1: Evaluation Results of Multipurpose Herbal Liquid Shampoo