Khandesh Education Society’s, Late Shri. P. C. Bhandarkar College of D. Pharmacy and Late Prof. R. K. Kele College of B. Pharmacy, Amalner.
The increasing consumer preference for natural and skin-friendly cosmetic products has led to a surge in the development of herbal-based formulations. This study focuses on the formulation and evaluation of a herbal soap using extracts from Ocimum tenuiflorum (Tulsi), Azadirachta indica (Neem), Aloe barbadensis (Aloe vera), and Curcuma longa (Turmeric), all known for their therapeutic skin benefits. The leaves and rhizomes were sourced from organic local gardens, shade-dried to preserve phytochemicals, and processed using standard extraction techniques. A glycerin soap base was used for formulation, and rose water was incorporated for its cooling effect and pleasant aroma. Three different batches were prepared with varying concentrations of the herbal ingredients to optimize the formulation. The final products were evaluated for key physicochemical and sensory parameters, including appearance, odor, pH, foam height, solubility, washability, and skin irritancy. The formulated soap showed a brownish-black appearance, smooth texture, and aromatic fragrance. The pH ranged between 8 and 9, within the acceptable range for skin use. The soap produced satisfactory foam height (150 mm), was soluble in water, and showed good washability. No skin irritation was observed during the irritancy test. The study concluded that the herbal soap is safe for topical application and effective as a natural alternative to synthetic soap products. Its formulation leverages the antimicrobial, antifungal, and skin-soothing properties of the selected herbal extracts. Further studies on antimicrobial efficacy and stability are recommended to establish long-term usability and commercial potential.
Skin Structure and Its Role in Health
The skin is the body’s largest organ and serves as the first line of defense against environmental aggressors, including microorganisms, ultraviolet radiation, chemicals, and physical injury. It plays crucial roles in thermoregulation, immune surveillance, hydration control, and sensory perception [1]. Composed of three main layers—epidermis, dermis, and hypodermis—the skin provides structural support and maintains internal homeostasis [2]. Among these, the epidermis acts as the primary barrier, particularly due to the stratum corneum, which controls trans-epidermal water loss and prevents entry of pathogens [3]. Maintaining the health of the skin is not only essential for physical protection but also for mental and social well-being. Skin conditions such as dryness, acne, or infections significantly affect an individual’s quality of life and often require targeted interventions [4]. Hence, understanding the nature of skin and adopting appropriate skincare practices are vital.
Types of Skin and Basic Skincare Needs
Skin type is determined by genetic, environmental, and hormonal factors. It is generally classified into five types: normal, oily, dry, combination, and sensitive [5].
The Role of Soap in Skincare
Soap is a widely used personal hygiene product formulated by the saponification reaction, where triglycerides (fats/oils) react with an alkali to produce glycerol and soap salts. Soaps function as surfactants—lowering surface tension and emulsifying oils and dirt—thus enabling their removal from the skin [8]. Despite their cleansing properties, many commercial soaps contain artificial fragrances, petrochemicals, preservatives, and synthetic surfactants like sodium lauryl sulfate, which may disrupt the skin microbiota and provoke allergic or irritant contact dermatitis [9]. As consumers become increasingly conscious of these drawbacks, there has been a strong shift towards natural and herbal-based soaps that offer mild yet effective cleansing without compromising skin health [10].
Herbal Soaps: A Safer, Biocompatible Alternative
Herbal soaps are prepared using plant-based extracts, essential oils, and natural colorants. Unlike synthetic products, they are free from harmful chemicals, making them suitable for all skin types, particularly for individuals with sensitive or allergy-prone skin [11]. The therapeutic value of herbal ingredients lies in their phytoconstituents such as flavonoids, saponins, alkaloids, glycosides, and essential oils, which exhibit antimicrobial, antioxidant, anti-inflammatory, and wound-healing properties [12]. Thus, herbal soaps not only cleanse the skin but also enhance its physiological resilience and texture.
Common Skin Disorders and Herbal Management
Skin disorders like acne vulgaris, bacterial and fungal infections, eczema, and dermatitis are widespread, affecting both urban and rural populations globally. Factors contributing to these issues include excessive pollution, microbial exposure, poor hygiene, hormonal imbalances, and the use of unsuitable skincare products [13]. Chemical-based treatments, though effective, often have limitations including resistance development (in the case of antimicrobials), allergic reactions, and long-term toxicity [14]. Consequently, there is growing demand for herbal interventions that are safer and more sustainable. Herbs such as Tulsi, Neem, and Aloe vera are among the most studied natural remedies for dermatological conditions.
Therapeutic Significance of Tulsi (Ocimum sanctum)
Tulsi, also known as Holy Basil, has been revered in Ayurveda for its antimicrobial, antioxidant, and anti-inflammatory properties. It contains active constituents such as eugenol, ursolic acid, and carvacrol that combat bacterial and fungal infections [15]. Tulsi extract is known to promote wound healing, prevent acne formation, and improve skin elasticity, making it an ideal component in herbal cosmetic formulations [16]. Its adaptogenic and detoxifying effects help in maintaining skin balance and reducing oxidative damage induced by environmental stressors [17].
Antimicrobial Potential of Neem (Azadirachta indica)
Neem is widely recognized for its medicinal efficacy, especially in treating skin ailments. Its leaves and oil contain compounds like azadirachtin, nimbidin, and nimbolide that exhibit strong antibacterial, antifungal, and anti-inflammatory actions [18]. Neem-based preparations are effective against Propionibacterium acnes, Staphylococcus aureus, and Candida albicans, pathogens commonly involved in acne and skin infections [19]. Neem also enhances skin immunity and reduces inflammation, making it a preferred choice for formulating dermatological products [20].
Moisturizing and Healing Properties of Aloe Vera (Aloe barbadensis miller)
Aloe vera gel is a rich source of polysaccharides, enzymes, vitamins (A, C, E, B12), and amino acids, contributing to its skin-soothing and moisturizing properties. It is especially effective in treating dry, irritated, or sunburned skin [21]. The mucopolysaccharides in Aloe help retain skin moisture, while its gibberellins and auxins promote collagen synthesis and wound healing. Moreover, Aloe exhibits mild antimicrobial properties and is commonly used to manage minor cuts, eczema, and burns [22].
Need for the Work
The increasing awareness of the adverse effects associated with synthetic skincare products has led to a global interest in herbal and natural alternatives. Many commercial soaps contain chemical agents such as artificial fragrances, surfactants, and preservatives, which can disrupt the skin's natural barrier, cause dryness, irritation, or even long-term skin damage. This has prompted both consumers and researchers to explore safer and more skin-friendly options for daily cleansing and skincare routines. Natural herbs, especially those used traditionally in Indian medicine, offer a wide range of skin benefits due to their antibacterial, antifungal, anti-inflammatory, and antioxidant properties. Plants like Ocimum sanctum (Tulsi), Azadirachta indica (Neem), and Aloe barbadensis (Aloe vera) are recognized for their therapeutic activities and skin compatibility. These herbs have been used for centuries to treat skin ailments such as acne, eczema, wounds, and infections, yet their incorporation into modern personal care formulations is still limited. Combining them in a single soap formulation can help bridge the gap between traditional herbal knowledge and modern skincare demands. Tulsi is known for its strong antimicrobial and anti-inflammatory activity, which helps protect the skin from microbial infections and reduces acne-related inflammation. Neem contains bioactive compounds like nimbidin and azadirachtin that exhibit antibacterial, antifungal, and antiparasitic properties, making it effective for managing skin infections and promoting overall skin health. Aloe vera is widely used for its moisturizing, soothing, and skin-repairing effects, making it suitable for dry, sensitive, and irritated skin. A soap formulated with these three components could potentially offer holistic benefits such as cleansing, moisturizing, and healing, all in one product. There is also a rising demand for eco-friendly and biodegradable skincare formulations that are free from animal testing and harmful residues. Soaps made from plant-based materials are typically biodegradable and non-toxic to aquatic life, making them a more sustainable choice than synthetic soaps. Incorporating herbal ingredients not only enhances product safety but also aligns with the global movement toward green chemistry and sustainable product development. Furthermore, the formulation and evaluation of herbal soaps using standardized methods are still under-explored in scientific literature. There is a clear need to develop and assess herbal soap formulations using measurable parameters such as physical characteristics, pH, cleansing ability, foaming index, and antimicrobial activity. Such studies can validate the efficacy and stability of herbal formulations, contributing to their commercial acceptability and consumer trust.
MATERIAL AND METHOD
Ingredients for Herbal Soap Formulation
The herbal ingredients selected in this formulation offer synergistic skin benefits, contributing to cleansing, hydration, and skin health. The table below presents a detailed account of each ingredient’s pharmacognostic features, their cosmetic importance, and phytochemical profiles.
1. Tulsi (Ocimum tenuiflorum)
2. Turmeric (Curcuma longa)
3. Neem (Azadirachta indica)
4. Aloe Vera (Aloe barbadensis)
5. Rose Water (Rosa damascena)
6. Coconut Oil (Cocos nucifera)
7. Glycerin Soap Base
8. Distilled Water & Ethanol (70%)
Collection and Extraction of Herbal Ingredients
To ensure the efficacy of the herbal soap formulation, fresh plant materials were collected and processed using simple yet effective extraction techniques. Each plant component was carefully handled to preserve its bioactive constituents.
1. Collection of Herbal Materials
2. Extraction of Tulsi Leaves
Figure 1: Crushing of Tulsi Leaves with Mortar and Pestle
Figure 2: Maceration and Filtration of Crushed Tulsi Mass
3. Extraction of Neem Leaves
Figure 3: Washing, Drying, and Crushing of Neem Leaves
Figure 4: Filtration Using Muslin Cloth and Whatman Filter Paper
4. Extraction of Aloe Vera Gel
5. Preparation of Turmeric Powder
6. Crude Extract Preparation and Usage
Formulation of Herbal Soap
Table 1: Source of Ingredients [35-37]
|
Ingredients |
Source (Plant Part or Type) |
|
Tulsi |
Leaves of Ocimum tenuiflorum |
|
Neem |
Leaves of Azadirachta indica |
|
Aloe Vera |
Leaf pulp of Aloe barbadensis |
|
Turmeric |
Rhizome of Curcuma longa |
|
Rose Water |
Laboratory-prepared solution (Rosa damascena) |
|
Glycerine Soap Base |
Laboratory grade |
Table 2: Role of Ingredients in Soap [18, 31, 34, 38]
|
Ingredients |
Therapeutic Role in Soap |
|
Tulsi Extract |
Antibacterial, Antimicrobial |
|
Neem Extract |
Antibacterial, Anti-acne |
|
Aloe Vera Extract |
Anti-aging, Moisturizing |
|
Turmeric Powder |
Antifungal, Wound Healing |
|
Glycerine Soap Base |
Soap base, Hydrating agent |
|
Rose Water |
Cooling, Skin Soothing |
Table 3. Formulation Profile
|
Ingredients |
Quantity |
|
Tulsi |
5.5 g |
|
Neem |
5.5 g |
|
Aloe Vera |
5 g |
|
Turmeric |
2 g |
|
Soap base |
50 g |
|
Rose water |
4 ml |
|
Coconut oil |
5 ml |
The formulation method involved drying and crushing the herbal leaves (Tulsi and Neem), extracting the gel from Aloe vera, and grinding the turmeric root to a fine powder. All extracts were filtered using clean muslin cloth and Whatman No.1 filter paper to remove particulate matter, and were then incorporated into the melted glycerine soap base at controlled temperatures. Coconut oil was added to enhance moisturization and improve lathering properties [39,68].
Procedure for Herbal Soap Preparation
The herbal soap was formulated by using plant-based ingredients including Ocimum sanctum (Tulsi), Azadirachta indica (Neem), Aloe barbadensis (Aloe vera), and Curcuma longa (Turmeric) along with a glycerin base and rose water through the melt and pour method, widely accepted in herbal soap formulation [34].
Procedure:
Evaluation of Herbal Soap Formulation
Herbal soap was evaluated for various physicochemical and organoleptic parameters to assess its safety, efficacy, and quality. These parameters are essential to confirm consumer acceptability and regulatory compliance in herbal cosmetic formulations [34].
1 Organoleptic Evaluation
Organoleptic characteristics such as colour, Odor, and texture were visually and physically assessed:
Organoleptic evaluation is a primary step in the preliminary assessment of cosmetic formulations and influences consumer preference [45].
2 pH Determination
To determine the pH, approximately 5–6 g of the formulated soap was weighed and transferred into a 100 mL beaker. About 40 mL of distilled water was added, and the soap was allowed to disperse uniformly. The pH of the resulting solution was measured using a calibrated digital pH meter [40]. The pH of the herbal soap was found to be in the range of 6.0 to 6.5, which is suitable for maintaining the skin’s natural pH and does not cause irritation [48].
3 Foam Height Test
To evaluate the foaming ability of the soap, 0.5 g of the sample was dissolved in 25 mL of distilled water. The solution was then transferred to a 100 mL measuring cylinder and made up to 50 mL with additional distilled water. The cylinder was shaken vigorously for 25 strokes, and the foam height above the aqueous solution was measured [46].
A stable foam of considerable height was observed, indicating good surfactant and cleansing properties in the herbal soap [49].
4 Solubility Test
For the solubility evaluation, 1.5 g of the soap was added into 10 mL of different solvents such as water, ethanol, and chloroform. The mixture was shaken for 3 minutes, and the solubility behavior was observed visually [44]. The soap showed good solubility in water and partial solubility in ethanol, but it was insoluble in non-polar solvents like chloroform, indicating the presence of hydrophilic constituents [50].
5 Skin Irritancy Test
The skin irritancy test was performed by applying a small quantity of the soap on a cleaned area of human skin (forearm) and observing the area for 24 hours. Parameters like redness, itching, or burning sensation were noted [51]. No signs of irritation were observed, suggesting that the herbal soap formulation is safe for external use and does not harm normal skin physiology [52].
6 Washability Test
To assess washability, the formulated soap was applied to the skin and then rinsed with water. The ease of removal and any residue were recorded manually [53]. The soap was found to be easily washable, leaving no oily or greasy residue on the skin, which further confirms the effective formulation of the soap [54].
RESULT
The formulated herbal soap was evaluated based on various physicochemical and organoleptic parameters. The results are presented below:
Table 4: Evaluation Parameters and Observations
|
Parameter |
Observation |
|
Appearance |
Brownish black |
|
Odor |
Pleasant herbal fragrance |
|
pH |
8–9 (within acceptable range for topical applications) |
|
Foam Height |
150 mm (indicating good foaming ability) |
|
Solubility |
Soluble in water |
|
Washability |
Good |
|
Skin Irritability |
No irritation observed |
These results indicate that the herbal soap formulation possesses acceptable aesthetic appeal, cleansing efficacy, foamability, and skin compatibility, making it suitable for cosmetic use. The pH value lies within the dermatologically safe range, and no adverse skin reactions were noted during irritancy testing [40,53].
DISCUSSION
The formulated herbal soap demonstrated promising characteristics in terms of physical, chemical, and dermatological evaluation. The pH of the final formulation was found to be in the range of 8 to 9, which is within the permissible limits for topical cosmetic formulations. Maintaining a slightly alkaline pH is essential in cleansing products as it enhances the soap's ability to remove oils and dirt from the skin, while still being gentle enough to avoid irritation or disruption of the skin's natural barrier function [55]. Excessively acidic or alkaline products can lead to conditions like xerosis or contact dermatitis, and hence, a balanced pH is critical for consumer safety and comfort [56]. The appearance of the soap was reported to be brownish-black, which can be primarily attributed to the phytochemicals and natural pigments derived from Tulsi, Neem, Aloe vera, and turmeric. These herbal ingredients contain a variety of phenolic compounds, flavonoids, and essential oils, which not only contribute to therapeutic value but also give the formulation a characteristic color and aroma [57,58]. The pleasant herbal fragrance of the soap also supports the presence of volatile aromatic compounds from the plant extracts, particularly from Tulsi and Neem, which are known to contain eugenol, terpenoids, and other essential oils that contribute to both antimicrobial activity and a pleasing scent [59]. The soap showed excellent washability and complete solubility in water, which are critical parameters for consumer convenience and product efficacy. A formulation that disperses easily in water ensures better application, rinsing, and hygiene, without leaving behind any sticky residue [60]. Moreover, a foam height of 150 mm was observed, indicating substantial foaming ability, which plays a key role in the sensory appeal of soaps and their perception of cleansing efficiency by consumers [61]. Although foam does not directly correlate with cleaning power, it significantly influences user satisfaction. Most importantly, the skin irritancy test revealed no signs of irritation, redness, or allergic response after 24 hours of application, suggesting excellent dermatological compatibility. This result confirms the suitability of using plant-based ingredients such as Aloe vera, which is known for its soothing, anti-inflammatory, and moisturizing effects, along with Neem and Tulsi, which offer antibacterial and antifungal benefits without compromising skin health [62,63]. Synthetic soaps, on the other hand, often contain harsh surfactants such as sodium lauryl sulfate, artificial colors, and preservatives that can provoke adverse skin reactions, especially in individuals with sensitive skin or allergic tendencies [64]. The combined therapeutic effects of the herbal ingredients used in the formulation significantly enhance its overall performance. Tulsi (Ocimum sanctum) contains active constituents like ursolic acid and eugenol, which have shown broad-spectrum antimicrobial activity and antioxidant potential [65]. Neem (Azadirachta indica) has been extensively used in Ayurvedic medicine for its ability to combat bacterial and fungal infections, while also providing anti-inflammatory properties [22]. Aloe vera, rich in polysaccharides and vitamins, contributes to skin hydration, repair, and rejuvenation [66]. These three components work synergistically to create a formulation that is not only effective in cleansing but also promotes healthy, nourished skin. The brownish-black appearance, good foam formation, ease of washing, and absence of irritancy collectively point to a well-balanced formulation. This herbal soap can be positioned as a natural and eco-friendly alternative to commercially available synthetic soaps, catering to growing consumer preferences for green and sustainable personal care products [67]. Furthermore, the incorporation of glycerine as the soap base enhances moisturization, making the product suitable for daily use even in individuals with dry or sensitive skin.
CONCLUSION
The present study aimed to formulate and evaluate a herbal soap utilizing Tulsi, Neem, Aloe vera, and turmeric, along with a glycerine base and rose water to enhance sensory and functional properties. The formulated soap demonstrated a pH of 8–9, pleasant herbal fragrance, brownish-black coloration, and good foaming and solubility, all of which are considered essential qualities in a consumer-friendly herbal cleansing product. No signs of skin irritation were noted during dermatological testing, affirming its safety and suitability for regular topical use. These results indicate that herbal ingredients can be successfully integrated into a natural soap formulation without compromising product stability or safety. The synergistic actions of Tulsi, Neem, and Aloe vera provided antimicrobial, antifungal, antioxidant, and skin-soothing benefits, confirming the efficacy and therapeutic potential of the final product. The inclusion of rose water further enhanced the fragrance and cooling effect, while glycerine supported hydration and smoothness on application. The study thus concludes that the formulated herbal soap is alternative to synthetic commercial soaps, with benefits such as skin compatibility, environmental friendliness, and natural antimicrobial protection. However, to fully realize its market potential, further studies are recommended. These may include microbial efficacy tests, long-term stability analysis, accelerated shelf-life testing, and comparative studies against branded soaps to substantiate and optimize its functional profile.
REFERENCES
Prafulla Chavan*, Pritam Patil, Swapnali Mahajan, Satish Bramhane, Rohit More, Anuja Mahajan, Development of A Polyherbal Soap Using Tulsi, Neem, Aloe Vera, And Turmeric: A Natural Skincare Approach, Int. J. of Pharm. Sci., 2025, Vol 3, Issue 7, 3705-3719. https://doi.org/10.5281/zenodo.16520224
10.5281/zenodo.16520224