INTRODUCTION:

Gandhaka is an important mineral drug extensively described in Ayurvedic literature and holds a prominent place in Rasashastra. The term Gandhaka is derived from the classical statement “Tivragandhatvamitigandakah”¹, which means that a substance possessing a strong and characteristic odor is known as Gandhaka. This etymological derivation highlights its intrinsic property of emitting an intense pungent smell, which distinguishes it from other mineral substances. Owing to this characteristic Tivra Gandha, it is universally recognized as Gandhaka in Ayurvedic classics. In Rasashastra, Gandhaka occupies a position next only to Parada in significance and is considered indispensable in several pharmaceutical processes involving mercury, including Murchhana and Jarana. It is believed to enhance the therapeutic efficacy of Parada while simultaneously reducing its toxic effects, thereby making it an essential component in mercurial formulations². Due to this unique role, Gandhaka is extensively utilized in Rasashastra pharmaceutics and is regarded as one of the most valuable mineral substances in Ayurvedic drug preparation.

Classical texts classify Gandhaka under Uparasa varga³, where it is considered the foremost drug of this category. Its utility is not confined solely to pharmaceutical processing but also extends to direct therapeutic applications in a wide range of disorders. The origin of Gandhaka has been described in Ayurvedic literature with profound mythological significance. According to Rasaratna Samucchaya, Gandhaka is believed to originate from the Raja (menstrual blood) of Goddess Parvati⁴, symbolizing its Agnikari Guna or fire-inducing property, which correlates with its Ushna Veerya and transformative action in alchemical procedures. Another traditional account associates its origin with Samudra Manthana(churning of the ocean), during which Gandhaka is said to have emerged along with Amrita. This association emphasizes its divine origin and therapeutic importance, portraying it as a potent rejuvenative and transformative substance in Ayurveda.

Historically, Gandhaka has been known since ancient times, although explicit mention of it is absent in Vedic literature. No direct synonym or reference to Gandhaka is available in the Vedas, suggesting that its medicinal prominence emerged during the post-Vedic period. Historical evidence suggests that the Aryans were among the earliest to use Gandhaka for medicinal purposes and fumigation. Subsequently, its applications spread to other civilizations such as the Greeks and Romans, who used sulphur compounds for disinfection, purification, and medicinal purposes⁵. In classical Ayurvedic texts including Charaka Samhita, Sushruta Samhita, and Ashtanga Hridaya, Gandhaka is extensively described for both internal and external therapeutic uses. It is particularly indicated in the management of dermatological disorders such as Kushtha, Kandu, Pama, and Vicharchika. Externally, it is employed in the form of dusting powders, medicated oils, and ointments, whereas internal administration is recommended in chronic systemic disorders.

With the evolution of Rasashastra as a specialized branch of Ayurveda, the significance of Gandhaka increased considerably. It became an essential ingredient in numerous mercurial formulations and played a crucial role in various Parada-related pharmaceutical processes. Thus, its role gradually expanded from being merely a therapeutic substance to becoming a fundamental component of Ayurvedic alchemy and pharmaceutics. Despite its extensive use, raw Gandhaka presents certain limitations due to the presence of physical and chemical impurities, along with potential toxicity. Classical texts therefore strongly emphasize the necessity of proper Shodhana before its therapeutic or pharmaceutical use. The purification process is intended to remove physical impurities such as sand, stone particles, and clay (Shilachurna), as well as toxic contaminants including arsenic and lead, collectively referred to as Visha Dosha.

Furthermore, numerous classical references describe variations in Gandhaka purification methods, purification media, and processing procedures. These variations necessitate a comprehensive review to better understand their pharmaceutical significance and to establish standardization in the preparation of Gandhaka-based formulations. In addition, modern scientific investigations have extensively explored sulphur with respect to its physical, chemical, and biological properties, including antimicrobial, keratolytic, antiparasitic, and detoxifying activities. Therefore, integrating classical Ayurvedic concepts with contemporary scientific understanding is essential for developing a holistic perspective on Gandhaka and supporting its safe, rational, and effective use in modern Ayurvedic practice.

MATERIALS AND METHODS:

The present review is based on a comprehensive compilation and critical analysis of classical Rasashastra texts including Rasa Tarangini, Rasa Ratna Samucchaya, Rasarnava, Anandakanda, Ayurveda Prakasha, Rasendra Chudamani, Rasa Chandanshu, Rasendra Sara Samgraha, Rasa Prakash Sudhakara, and other authoritative treatises. All available information related to Gandhaka—such as nomenclature, synonyms, sources, varieties, Grahya Lakshana, Dosha, Shodhana procedures, pharmacological properties, and therapeutic uses—was systematically compiled. Relevant research articles, review papers, textbooks, and authoritative web resources were screened for collecting literature pertaining to the chemical properties, allotropes, biological significance, pharmacological activities etc of sulphur.

RESULT:

A. Classical view of Gandhaka:

1. Gandhaka in Samhita Grantha:

The references related to Gandhaka available in classical Ayurvedic literature can be traced from Samhita Grantha, Sangraha Grantha, and Rasa Grantha. Among the Samhita texts, Charaka Samhita, Sushruta Samhita, Bhela Samhita, and Kashyapa Samhita hold an important position.

Among these texts, references to Gandhaka are predominantly available in Charaka Samhita. Gandhaka has been described for both internal and external therapeutic applications. Its earliest mention is found in Sutra Sthana under the formulation Kushthadi Churna⁶, where Gandhaka is prescribed externally in powdered form along with other drugs for the management of various types of Kushtha (skin disorders). The text further advises the intake of Amalaki juice and honey after administration. This formulation is described as effective in alleviating seventeen types of Kushtha⁷.

Another important reference occurs in Shwasa-Kasa Chikitsa, where Gandhaka is included in the formulation Muktadi Churna⁸. This yoga is indicated for the treatment of Shwasa (dyspnea), Kasa (cough), Hikka (hiccup), and certain eye disorders. These references suggest that Gandhaka was already recognized as a valuable medicinal substance during the Charaka period. The presence of multiple synonyms for Gandhaka in Charaka Samhita further indicates its widespread familiarity and therapeutic importance. However, except for Charaka Samhita, detailed references to Gandhaka are largely absent in other major Samhita texts.

2. Gandhaka in Sangraha Grantha:

Among Sangraha texts, Ashtanga Sangraha and Ashtanga Hridaya, authored by Acharya Vagbhata, represent the further development of Ayurvedic pharmacology. These texts demonstrate increasing inclusion of mineral and metallic drugs in therapeutics. References to Gandhaka are found in these compilations, indicating its continued medicinal use^9,10,11.

Subsequent authors such as Chakrapani, Vrinda, Vangasena, and Madhavakara provided more elaborate discussions on Gandhaka. Vangasena described formulations such as Gandhaka Druti, Gandhaka Rasayana, and Gandhaka Kalpa. Among these scholars, Acharya Chakrapani deserves special mention for systematically incorporating mineral drugs into therapeutics. In his text Chakradatta, he described methods for Shodhana (purification) of Gandhaka along with other mineral substances. Gandhaka was also indicated in Tamra Marana (incineration of copper), reflecting its importance in pharmaceutical processing¹².

3. Gandhaka in Rasa Grantha

Extensive information regarding Gandhaka is available in Rasa Shastra literature, where it is regarded as one of the most important mineral substances.

Rasendra Mangala is among the earliest texts containing references to Gandhaka, where it is described as Satva Rupa¹³. In Rasarnava, considered one of the oldest and most authentic Rasa texts, detailed descriptions regarding the origin, classification, purification, and pharmaceutical processing of Gandhaka are available, particularly in the seventh Patala.

Rasendra Chudamani, authored by Somadeva, provides material related to Gandhaka in its eleve chapter. In Rasa Prakasha Sudhakara, authored by Yashodhara Bhatta, Gandhaka is described as possessing Madhura Vipaka.

Rasa Ratna Samuccaya, authored by Rasa Vagbhata, gives a systematic account of Gandhaka including its origin, types, purification methods, Gandhaka Druti, and therapeutic applications¹⁴.

In Rasadhyaya, authored by Kankalayogi, precise guidelines regarding temperature regulation during Gandhaka Dravana are mentioned¹⁵. Rasa Paddhati by Acharya Vrinda describes the use of Kurma Puta for Gandhaka melting and recommends sealing vessels with woolen cloth¹⁶.

Rasa Manjari discusses purification of Gandhaka through Dola Yantra Swedana method¹⁷, while Rasa Sara explains purification using Rakta, Sneha, Vasa, Dugdha, and Swedana techniques. Ananda Kanda¹⁸ contains detailed procedures for Satvapatana (extraction of essence) of Gandhaka.

In Rasendra Chintamani, purification by Bhavana method is described¹⁹. Rasa Kamadhenu compiles knowledge from earlier Rasa texts and contains abundant material related to Gandhaka²⁰.

Ayurveda Prakasha by Madhava Upadhyaya explains Gandhaka Kalpa and graded dosage administration of Gandhaka²¹. Rasa Tarangini by Sadananda Sharma integrates principles of chemistry and describes purification using lime water and hydrochloric acid²².

The twentieth-century text Rasayana Sara by Shyamasundara Vaishya emphasizes practical pharmaceutical experience, recommending disease-specific purification media for Gandhaka and advising the use of purification liquids in double quantity during the Dhalana method²³.

Rasa Yoga Sagara²⁴ and Rasa Jala Nidhi²⁵ also provide comprehensive compilations of formulations and classical knowledge related to Gandhaka.

4. Synonyms of Gandhaka:^26,27,28

Table 2: Showing the synonyms of Gandhaka according to various texts:

Based on	Name
Mythology	Gauribeeja, Gauripuspabhavah, Balivasa, Lelitaka, Balibala, Daityendra, Bali
Physical property	Navanita, Gandhapasana, Vasakara, Vasavata, Gandhopala
Odour	Gandhaka, Saugandhika, Atigandha, Kruragandha, Divyagandha, Putigandha
Therapeutic property	Kitaghna, Kusthari, Pamari, Kitari, Lekhi, Kitanasana
*Dhatukarma*	Shulvari, Shulvaripu, RasaGandhaka, Sutashatru, Dhartumari
Colour	Sukapicchakya, Sukapuccha, Sukapicchasamacchayo, Pita Gandhaka

5. Sources of Gandhaka:

Gandhaka (sulphur) is obtained from both natural and mineral sources and occurs in various forms in nature. Among mineral sources, it is commonly derived from sulphide ores such as pyrite (FeS₂), galena (PbS), cinnabar (HgS), sphalerite (ZnS), and stibnite (Sb₂S₃), which contain sulphur combined with different metals. Sulphur is also found in sulphate minerals including gypsum (CaSO₄) and alunite, where it exists in oxidized form as sulphate compounds. In addition to mineral deposits, Gandhaka is naturally available from volcanic emissions and hydrothermal vents, where elemental sulphur is deposited through geological processes involving high temperature and pressure. These diverse natural occurrences make sulphur an abundantly available mineral with wide industrial, medicinal, and pharmaceutical applications.

6. Occurrence of Gandhaka:

In India, natural deposits of Gandhaka (sulphur) are relatively limited, with occurrences reported mainly in regions such as Tsokar Lake in Leh, Jammu and Kashmir. However, there is no major large-scale mining activity for elemental sulphur in the country. As a result, most commercial sulphur production in India takes place as a by-product of industrial processes, particularly from fertilizer plants located at Panipat, Naya Nangal, and Bhatinda, as well as from oil refineries such as those in Mathura and Jamnagar. On a global scale, substantial sulphur deposits and production are found in countries like Poland, Mexico, and the USA, which are among the major contributors to the worldwide sulphur supply.

7. Varieties of Gandhaka:

Classical texts classify Gandhaka based on colour into four types. (Table-3).

8. Properties of Gandhaka:

Gandhaka is considered one of the most important mineral drugs in Rasa Shastra. Among all medicinal substances used in Ayurvedic pharmaceutics, purified Gandhaka occupies a unique place because of its extensive therapeutic utility as well as pharmaceutical importance. Classical texts describe Gandhaka as Rasendra, Rasaraja, and Rasayana, indicating its superiority among mineral drugs. It is also described as more efficacious than gold in certain therapeutic actions. Due to its ability to combine with and stabilize Parada (mercury), Gandhaka is regarded as indispensable in mercurial processing and formulation preparation. This special affinity with mercury is the reason why Gandhaka is included in nearly 95% of Rasa formulations. Owing to its broad therapeutic spectrum and pharmaceutical importance, an understanding of its pharmacodynamic properties is essential.

According to classical Rasa Shastra literature, Gandhaka possesses Katu and Tikta rasa, Laghu, Ushna, and Sara guna, Ushna virya, Katu vipaka, and is predominantly Kapha-Vata shamaka in action.

Table 3: Showing types and uses of Gandhaka

Sr. No.	Name of Text	Types and uses of Gandhaka
Sr. No.	Name of Text	*Shweta*	*Rakta*	*Peeta*	*Krishna*
1.	Rasarnav, Rasa Ratna Samuchaya, Anand Kand	-Adhama -Vipra -Aushadha Yoga	-Uttama -Kshitriya -Lauha Vedha	-Madhyama -Vaishya -Rasayan	-.... -Kshudra -Lepana
2.	Rasa Ratna Samuchaya, Rasendra Saara Sangraha, Ayurveda Prakash, Raskamadhenu, Rasendra Purana, Rasendra Bhaskar, Rasajal- Nidhi, Vrihad Yoga Tantra,Vrihad Rasaraj Sundar	-Khatika -Lepa, Lauha-Marana	-Shreshtha -Rasarasayana	-Shreshtha -Rasarasayana	-Durlabha Jaramrityunashana
3.	Rasayan Saara, Rasendra, Purana, Vrihad Rasraj Sundar	-Loniya -Lepartha	-Raktamlasara -Rasopyogi	-Pittamlta -Rasopyogi	-........ -........

Rasa: The rasa of Gandhaka has been described mainly as Katu (pungent) and Tikta (bitter) in most classical texts. These tastes are generally associated with properties such as Deepana, Pachana, Lekhana, Shodhana, and Kleda Shoshana. However, some scholars have also attributed a sweet component to Gandhaka. In Ayurveda Prakasha, Gandhaka is described as Madhura, while texts such as Rasa Ratna Samuccaya and Rasendra Sara Sangraha mention expressions such as Gandhashma ati rasayana samadhura.

This has generated discussion among scholars regarding whether Gandhaka inherently possesses Madhura rasa. A critical interpretation suggests that Gandhaka itself should not be considered intrinsically sweet. Rather, the term Samadhura indicates association with sweet substances used during pharmaceutical processing. For example, in Gandhaka Rasayana, Gandhaka is repeatedly triturated with cow’s milk and other sweet media, followed by addition of sugar candy, which may explain the textual association with sweetness. Therefore, based on direct organoleptic and pharmacodynamic considerations, Gandhaka is accepted primarily as a Katu-Tikta rasa dominant dravya.

Guna: Among the twenty classical qualities, Gandhaka is specifically described as possessing Sara guna in texts such as *Bhava Prakasha, Ananda Kanda**,* and Rasa Tarangini. Sara guna is responsible for promoting movement and facilitating elimination.

In addition to Sara guna, Gandhaka can be pharmacodynamically inferred to possess Laghu, Ruksha, and Ushna qualities. This inference is based on its Katu-Tikta rasa, Ushna virya, Katu vipaka, and actions such as Deepana, Pachana, Amapachana, Vishahara, and Kushthaghna karma. Substances possessing these actions are classically characterized by Laghu and Ruksha properties. Thus, Gandhaka may be considered a Laghu-Ruksha-Ushna-Sara dravya.

Virya: The virya of Gandhaka is unanimously described as Ushna in classical literature. Texts including Rasa Tarangini, Ayurveda Prakasha, Ananda Kanda, Bhava Prakasha, Rasendra Purana, and Rasa Ratna Samuccaya consistently mention Ushna virya without any significant difference of opinion.

The Ushna nature of Gandhaka is reflected in its actions such as Kapha-Vata shamana, Agni Deepana, Pachana, and Ama Pachana. Ushna virya enables Gandhaka to counteract coldness, stagnation, and excessive Kapha accumulation, thereby making it highly useful in disorders involving impaired metabolism and accumulation of metabolic toxins.

Vipaka: The vipaka of Gandhaka is described as Katu in almost all Rasa Shastra texts. Only Rasa Prakasha Sudhakara mentions Madhura vipaka, which appears to be an isolated opinion.

Pharmacodynamically, Katu vipaka is more consistent with the properties and actions of Gandhaka. Its Katu-Tikta rasa, Ushna virya, Deepana-Pachana effect, Kapha-Vata shamana action, and ability to digest Ama all support Katu vipaka. Therefore, Gandhaka is generally accepted as possessing Katu vipaka.

Dosha Karma: Regarding doshic action, Ananda Kanda describes Gandhaka as Tridosha shamaka, whereas Ayurveda Prakasha and Bhava Prakasha clearly state it to be Kapha-Vata shamaka.

Based on analysis of its Rasa, Guna, Virya, and Vipaka, Gandhaka predominantly alleviates Kapha and Vata dosha. The Katu-Tikta rasa reduces Kapha by promoting drying and scraping actions, while Ushna virya mitigates Vata by counteracting coldness and promoting normal metabolic activity. Hence, Gandhaka is widely accepted as Kapha-Vata shamaka.

9. Special Therapeutic Actions of Gandhaka:

Due to its characteristic pharmacodynamic profile, Gandhaka exhibits several important therapeutic actions.

Pachana: Pachana refers to digestion of food and metabolic toxins without directly stimulating appetite. Gandhaka, because of its Katu rasa **and Ushna nature**, aids in digestion of Ama and supports metabolic transformation. Therefore, classical Rasa texts describe Gandhaka as a potent Pachana dravya.

Deepana: Deepana refers to stimulation of Jatharagni and enhancement of appetite. Gandhaka possesses Katu rasa, Ushna virya, and Laghu-Ushna qualities, which collectively enhance digestive fire. This makes Gandhaka useful in conditions associated with Agnimandya and reduced appetite.

Saran Karma: Due to its *Sara guna**, Gandhaka* facilitates downward movement of Vata and expulsion of fecal matter after digestion. This action is termed Saran karma or Anulomana. In modern medicine, this corresponds to the mild laxative effect of sulphur.

Shoshana : Shoshana refers to absorption and drying action. Gandhaka promotes proper absorption by maintaining digestive efficiency through Deepana and Pachana actions. Additionally, its therapeutic role in skin disorders helps maintain normal skin physiology, thereby supporting Shoshana karma.

Shodhana and Vishahara : Gandhaka is also described as possessing Shodhana and Vishahara properties. It helps in purification of tissues, elimination of toxins, and correction of metabolic disturbances. This explains its extensive use in numerous Rasa formulations as both a therapeutic and pharmaceutical agent.

10. Systemic effect and Uses of Gandhaka

Gandhaka possesses wide therapeutic utility due to its Deepana, Pachana, Krimighna, Kusthaghna, Rasayana, and Yogavahi properties. Because of these actions, it is used in disorders affecting multiple body systems.

In dermatological disorders, Gandhaka is indicated in diseases such as Kushtha, Visarpa, Kandu, and other skin diseases. When mixed with fatty substances and applied externally, it forms sulphides which exhibit mild antiseptic, antiparasitic, and keratolytic actions. Due to its Lekhana property, it helps in reducing excessive secretions, removing unhealthy tissue, and relieving skin infections and itching.

On the digestive system, Gandhaka acts as Deepana, Pachana, Pittasaraka, and Amapachaka. It improves digestion, enhances appetite, and digests Ama; therefore, it is beneficial in Agnimandya and digestive disorders. According to modern pharmacology, sulphur converts into sulphides in the intestine, which stimulate bowel movements and produce mild laxative action. This also supports its Krimighna effect in intestinal worm infestations.

In the circulatory system, Gandhaka acts as a Raktashodhaka by digesting Ama and promoting bile secretion. Hence, it is beneficial in disorders related to the liver and spleen. By purifying blood and reducing metabolic toxins, it is also useful in chronic skin disorders and rheumatic conditions associated with Kapha-Vata aggravation.

In the respiratory system, Gandhaka is described as Kapha-Vata shamaka. Due to this property, it is useful in the management of Shwasa and Kasa, where it helps in reducing Kapha accumulation and improving respiratory function.

In the reproductive system, Gandhaka is regarded as beneficial for Shukra Dhatu formation. Through its Deepana, Pachana, and Ama Nashana actions, it improves Dhatwagni and supports proper tissue metabolism. Its Yogavahi property further enhances the action of associated drugs, making it useful in formulations intended for reproductive strength and rejuvenation.

Thus, Gandhaka is widely used as a systemic therapeutic agent because of its actions on the skin, digestive, circulatory, respiratory, and reproductive systems.

11. Grahya Lakshana (Acceptable Characteristics)

As per Ayurveda Prakash²⁹, Gandhaka which is having colour of parrot tail feathers, similar to Navneeta, Masrina (Mridu), Snigdha (unctuous in nature), Kathina (hard) is considered as shrestha or grahya Gandhaka. As per Rasa Taragini³⁰, the best quality of Gandhaka should be clean without physical impurities (Nirmala), Lustrous, smooth on touch, its consistency like Navneeta, it should be coloured like tail feathers of parrot (Shukapiccha) or similar to turmeric (Rajanisamaprabha), these qualities are observed only in Amalasara Gandhaka so that should be taken for Rasa yoga preparation.

12. Gandhaka Dosha (Impurities)³¹

Gandhaka may contain certain impurities known as Gandhaka Dosha, which are classified mainly into two types. Shilachurna Dosha refers to the physical impurities present in raw Gandhaka, including sand, clay, dust particles, and other extraneous materials. Visha Dosha refers to the toxic impurities associated with Gandhaka, which may include harmful elements such as arsenic, lead, and other undesirable substances. These impurities are considered undesirable and are removed through proper Shodhana procedures before therapeutic administration.

13. Effects of Ashuddha Gandhaka

As per Ayurveda Prakasha³², if Ashuddha Gandhaka is taken internally it produces many undesirable effects in the body i.e. vitiation of Pitta and Rakta dosha, Jwara, Bhrama, Charmaroga, and destroys roopa, virya, bala, and shukra. It is mentioned in Rasa Ratna Samucchaya³³, that if ashuddha form is administered internally and apathy sevana continues, then it destroy the body like Halahala visha.

14. Gandhaka Shodhana (Purification)

Shodhana of Gandhaka is considered essential in Ayurveda to remove physical and chemical impurities, reduce toxicity, and enhance its therapeutic efficacy before medicinal use. A commonly employed purification method is Dhalana, in which Gandhaka is first melted along with Ghrita to facilitate proper liquefaction and separation of impurities. The molten Gandhaka is then filtered through a clean cloth into milk, allowing impurities to remain behind while the purified material solidifies in the liquid medium. This process is generally repeated 3 to 7 times to ensure thorough purification and improved quality. After completion of the procedure, the purified Gandhaka is washed with hot water to remove residual milk and ghee, yielding a cleaner and pharmaceutically suitable product.

16. Gandhaka Gandhanashana method

In this method of Gandhaka processing, the substance is first powdered to ensure uniform mixing and effective purification. The powdered Gandhaka is then mixed with milk and subjected to heating, which helps in softening the material and reducing impurities. Subsequently, suitable herbal juices are added to enhance the purification process and impart additional therapeutic qualities. The processed mixture is then poured into Triphala Kwatha, which acts as a purification medium and further detoxifies the Gandhaka. This procedure is particularly useful in reducing or eliminating the characteristic unpleasant odor of sulphur while improving its pharmaceutical acceptability and quality.

17. Gandhaka Satvapatana

Although the process of Satvapatana is described in Ayurvedic literature for the extraction of metallic or mineral essence, it is generally considered unnecessary in the case of Gandhaka. This is because Gandhaka is naturally regarded as Satvarupa, meaning it inherently exists in an essence form suitable for therapeutic use after proper purification. Classical texts mention, “Gandhakancha swabhavena satvarupam”, indicating that by its very nature, Gandhaka already possesses the characteristics of extracted essence. Therefore, unlike many other minerals and metals, Gandhaka usually does not require a separate Satvapatana procedure.

18. Therapeutic Uses

Gandhaka is widely used in Ayurvedic therapeutics due to its antimicrobial, detoxifying, and rejuvenating properties. It is especially indicated in the management of Kushtha (skin disorders) and various dermatological conditions such as Kandu (itching), Pama (scabies or skin eruptions), and Vicharchika (eczema). Owing to its Krimighna action, it is also beneficial in Krimi Roga (parasitic and worm infestations). In respiratory disorders, Gandhaka is used in conditions like Shwasa (dyspnoea or asthma) and Kasa (cough), where its Ushna and Kapha-reducing properties are helpful. Additionally, it is employed in musculoskeletal disorders such as Amavata (rheumatoid conditions) and Gridhrasi(sciatica), where it supports reduction of inflammation, pain, and aggravated Vata-Kapha doshas.

19. Dose and Anupana

The therapeutic dose of Gandhaka generally ranges from 1 to 8 Ratti, depending on the formulation, disease condition, patient strength, and physician’s discretion. For better efficacy and targeted therapeutic action, it is administered with appropriate Anupana (adjuvants). Commonly recommended Anupanas include Triphala Kwatha, which supports detoxification and digestive health; Vasa Kwatha, useful particularly in respiratory disorders; and Kantakari Kwatha, which is beneficial in conditions such as cough, asthma, and other Kapha-related respiratory ailments. In certain cases, Chitraka Churna is also used as an adjuvant to enhance digestion, metabolism, and the bioavailability of Gandhaka.

20. Pathya and Apathya

During Gandhaka therapy, following appropriate Pathya-Apathya is considered important to enhance therapeutic efficacy and minimize adverse effects. Recommended Pathya includes easily digestible and nourishing foods such as milk, ghee, rice, and wheat, which help maintain strength, support digestion, and balance the heat-producing nature of Gandhaka. On the other hand, certain dietary items are advised to be avoided as Apathya, including Amla (sour substances), Lavana (excessively salty foods), excessive oily preparations, and heavy food, as these may aggravate Pitta, hamper digestion, and interfere with the proper action of the medicine.

B. **Modern Review of Sulphur (Gandhaka)**

1. Historical Background of Sulphur⁴⁴

Sulphur has been known to human civilization since ancient times and is believed to derive its name from the Sanskrit term “Shulvari” and the Latin word “Sulphurium.” It occurs abundantly in nature and was identified and utilized early for various practical and medicinal purposes. Historical records indicate that the Greeks and Romans used sulphur for fumigation, disinfection, and bleaching processes. In the Bible, sulphur is referred to as “brimstone” or burning stone, highlighting its combustible nature. Assyrian texts dating from 700–600 B.C. describe sulphur as a “product of the riverside,” indicating awareness of its natural occurrence. The Greek poet Homer in the 9th century BC mentioned sulphur as a substance capable of averting pests and purifying surroundings. By around the 12th century, the Chinesehad discovered its utility in the preparation of gunpowder, marking an important technological application. In the field of alchemy, sulphur was regarded as one of the fundamental principles of matter, particularly in association with mercury, reflecting a concept somewhat analogous to the Parada–Gandhaka relationship described in Ayurvedic Rasashastra.

2. Physical and Chemical Properties⁴⁵

Sulphur (Gandhaka) is a multivalent non-metallic element that exists as a yellow crystalline solid in its natural form. It is tasteless and possesses a characteristic pungent odour. It is insoluble in water but soluble in solvents such as carbon disulphide and acetone. Sulphur is a poor conductor of heat and electricity. It has an atomic number of 16 and an atomic weight of 32.06. The melting point of sulphur ranges between 112–115°C, while its boiling point is approximately 444.6°C. The density of sulphur is about 2.06 g/cm³.

3. Forms of Sulphur⁴⁶

Sulphur exists in different physical forms, broadly classified into crystalline and amorphous varieties. Among the crystalline forms, the two major types are rhombic sulphur (α-sulphur) and monoclinic sulphur (β-sulphur), which differ in theirn crystal structure and stability under varying temperature conditions. Rhombic sulphur is the most stable form at ordinary temperatures, whereas monoclinic sulphur is stable at comparatively higher temperatures. In addition to crystalline forms, sulphur also occurs in amorphous forms, which lack a definite crystal structure. These include plastic sulphur, formed by rapid cooling of molten sulphur; colloidal sulphur, consisting of finely divided sulphur particles dispersed in a medium; and milk of sulphur, a fine precipitated form commonly prepared for pharmaceutical and medicinal purposes.

4. Toxicological Profile⁴⁷

Sulphur is generally considered relatively safe and possesses a low toxicological risk under normal conditions of use. In terms of acute toxicity, studies have shown that the oral LD₅₀ in rats is greater than 5000 mg/kg, while the dermal LD₅₀ is also reported to be above 5000 mg/kg, indicating low toxicity through oral and skin exposure routes. Additionally, sulphur exhibits low inhalation toxicity, although excessive exposure to sulphur dust or fumes may still cause discomfort. Regarding chronic toxicity, prolonged or repeated exposure can lead to respiratory irritation, along with eye irritation and bronchial disturbances, particularly in occupational settings. Based on its overall safety profile, sulphur is categorized under EPA Category IV, which represents the least toxic classification.

5. Sulphur Allergy⁴⁸

Sulphur-related compounds, particularly sulfonamides, may produce adverse reactions in certain sensitive individuals despite their therapeutic usefulness. Common reactions include skin rashes and hypersensitivity manifestations, which may range from mild eruptions to severe dermatological conditions such as Stevens–Johnson syndrome and toxic epidermal necrolysis, both of which are potentially life-threatening. In some cases, these compounds may also lead to systemic toxic effects including hepatitis and renal damage, affecting liver and kidney function. Additionally, respiratory complications such as breathing difficulty, hypersensitivity reactions, or irritation may occur, highlighting the need for cautious use and proper medical supervision during therapy with sulphur-containing compounds.

6. Biological Activity

Sulphur exhibits several important biological activities that contribute to its medicinal applications. After administration, it is converted into sulphides in the intestine, which produce a mild laxative effect and support bowel movement. Sulphur also stimulates the secretions of the skin and mucous membranes, thereby influencing local metabolism and excretory functions. In higher doses, it may act as a purgative. Owing to its antimicrobial and antiparasitic properties, sulphur is widely used both internally and externally in various therapeutic conditions. Externally, it is commonly applied in dermatological disorders such as scabies, ringworm, and pediculosis, where it helps eliminate parasites and microbial pathogens. Physiologically, sulphur also plays a significant role in the body by participating in bile acid formation and contributing to the maintenance of healthy skin, hair, and nails.

CONCLUSION:

The review highlights the profound importance of Gandhaka in Rasashastra as a highly valuable mineral drug with extensive pharmaceutical and therapeutic applications. The detailed descriptions available in classical texts regarding its identification, processing, and utilization reflect the systematic approach developed for ensuring the quality and efficacy of Gandhaka. The concept of Shodhana and proper selection of Gandhaka emphasizes the importance of pharmaceutical refinement before its therapeutic use. Overall, Gandhaka represents a significant contribution of Rasashastra, where its unique properties and versatile applications have established its importance in Ayurvedic pharmaceutics and therapeutics.

REFERENCES:

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11. Vagbhatacharya. Ashtanga Hridaya, edited by Pt. Hari Sadashiva Shastri Paradakara. Chikitsa Sthana. 10th ed. Ch. 22, Verse 19. Varanasi: Chaukhamba Sanskrit Sansthan; 2014.

12. Chakrapani. Chakradatta, edited by Prof. Priyavrat Sharma. Amlapitta Chikitsa Prakarana. Ch. 52, Verse 38-39. Varanasi: Chaukhamba Sanskrit Sansthan; 2014.

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44. WebElements, The University of Sheffield. Available from: http://www.webelements.com/

45. Modern Inorganic Chemistry. Ch. 24. p. 470.

46. Cornell University, PMEP (Pesticide Management Education Program). Sulphur Toxicology Profile. Available from: http://pmep.cce.cornell.edu/profiles/extoxnet/pyrethrins-Ziram/sulphur_ext.htm

47. Sulfa Allergy. Available from: http://allergies.about.com/od/medicationallergies/a/sulfa.htm

48. Sulfa Allergy. Available from: http://allergies.about.com/od/medicationallergies/a/sulfa.htm

Received on 22.06.2026 Revised on 14.07.2026

Accepted on 03.08.2026 Published on 12.09.2026

Available online from September 19, 2026

Asian J. Research Chem.2026; 19(5):507-516.

DOI: 10.52711/0974-4150.2026.00073

This work is licensed under a Creative Commons Attribution-Non Commercial-Share Alike 4.0 International License. Creative Commons License.

Text	Methods	Media Used	Procedure
Rasadhyaya³⁴	2	Milk, Ghrita	Dhalana
Rasarnava³⁵	5	Taila, milk, herbal juices	Dhalana, Bhavana
Anandakanda³⁶	6	Ghrita, milk, swarasa	Mixed methods
Chakradatta³⁷	1	Bhringaraja swarasa	Bhavana + Dhalana
Rasa Paddhati	2	Milk	Melting and pouring
Rasendra Chudamani³⁸	3	Milk, water	Swedana, Dhalana
Rasa Ratna Samucchaya³⁹	3	Milk, swarasa	Dhalana, Swedana
Rasa Prakash Sudhakara⁴⁰	1	Milk	Melting and pouring
Rasendra Chintamani⁴¹	3	Milk, ghrita	Dhalana, Bhavana
Rasayana Sara⁴²	4	Taila, kwatha	Dhalana, Nirvapa
Rasa Tarangini⁴³	6	Ghrita, milk, etc.	Multiple methods

INTRODUCTION:

MATERIALS AND METHODS:

1. Gandhaka in Samhita Grantha:

2. Gandhaka in Sangraha Grantha:

3. Gandhaka in Rasa Grantha

4. Synonyms of Gandhaka:^26,27,28

5. Sources of Gandhaka:

6. Occurrence of Gandhaka:

7. Varieties of Gandhaka:

8. Properties of Gandhaka:

Guna: Among the twenty classical qualities, Gandhaka is specifically described as possessing Sara guna in texts such as *Bhava Prakasha, Ananda Kanda**,* and Rasa Tarangini. Sara guna is responsible for promoting movement and facilitating elimination.

Virya: The virya of Gandhaka is unanimously described as Ushna in classical literature. Texts including Rasa Tarangini, Ayurveda Prakasha, Ananda Kanda, Bhava Prakasha, Rasendra Purana, and Rasa Ratna Samuccaya consistently mention Ushna virya without any significant difference of opinion.

Vipaka: The vipaka of Gandhaka is described as Katu in almost all Rasa Shastra texts. Only Rasa Prakasha Sudhakara mentions Madhura vipaka, which appears to be an isolated opinion.

Dosha Karma: Regarding doshic action, Ananda Kanda describes Gandhaka as Tridosha shamaka, whereas Ayurveda Prakasha and Bhava Prakasha clearly state it to be Kapha-Vata shamaka.

9. Special Therapeutic Actions of Gandhaka:

Deepana: Deepana refers to stimulation of Jatharagni and enhancement of appetite. Gandhaka possesses Katu rasa, Ushna virya, and Laghu-Ushna qualities, which collectively enhance digestive fire. This makes Gandhaka useful in conditions associated with Agnimandya and reduced appetite.

Saran Karma: Due to its *Sara guna**, Gandhaka* facilitates downward movement of Vata and expulsion of fecal matter after digestion. This action is termed Saran karma or Anulomana. In modern medicine, this corresponds to the mild laxative effect of sulphur.

Shoshana : Shoshana refers to absorption and drying action. Gandhaka promotes proper absorption by maintaining digestive efficiency through Deepana and Pachana actions. Additionally, its therapeutic role in skin disorders helps maintain normal skin physiology, thereby supporting Shoshana karma.

10. Systemic effect and Uses of Gandhaka

11. Grahya Lakshana (Acceptable Characteristics)

12. Gandhaka Dosha (Impurities)³¹

13. Effects of Ashuddha Gandhaka

14. Gandhaka Shodhana (Purification)

15. Classical Methods of Shodhana

**Table: 4. Shodhana Methods Across Texts**

16. Gandhaka Gandhanashana method

17. Gandhaka Satvapatana

18. Therapeutic Uses

19. Dose and Anupana

20. Pathya and Apathya

B. **Modern Review of Sulphur (Gandhaka)**

1. Historical Background of Sulphur⁴⁴

2. Physical and Chemical Properties⁴⁵

3. Forms of Sulphur⁴⁶

4. Toxicological Profile⁴⁷

5. Sulphur Allergy⁴⁸

6. Biological Activity

CONCLUSION:

INTRODUCTION:

MATERIALS AND METHODS:

1. Gandhaka in Samhita Grantha:

2. Gandhaka in Sangraha Grantha:

3. Gandhaka in Rasa Grantha

4. Synonyms of Gandhaka:26,27,28

5. Sources of Gandhaka:

6. Occurrence of Gandhaka:

7. Varieties of Gandhaka:

8. Properties of Gandhaka:

Guna: Among the twenty classical qualities, Gandhaka is specifically described as possessing Sara guna in texts such as Bhava Prakasha, Ananda Kanda, and Rasa Tarangini. Sara guna is responsible for promoting movement and facilitating elimination.

Virya: The virya of Gandhaka is unanimously described as Ushna in classical literature. Texts including Rasa Tarangini, Ayurveda Prakasha, Ananda Kanda, Bhava Prakasha, Rasendra Purana, and Rasa Ratna Samuccaya consistently mention Ushna virya without any significant difference of opinion.

Vipaka: The vipaka of Gandhaka is described as Katu in almost all Rasa Shastra texts. Only Rasa Prakasha Sudhakara mentions Madhura vipaka, which appears to be an isolated opinion.

Dosha Karma: Regarding doshic action, Ananda Kanda describes Gandhaka as Tridosha shamaka, whereas Ayurveda Prakasha and Bhava Prakasha clearly state it to be Kapha-Vata shamaka.

9. Special Therapeutic Actions of Gandhaka:

Pachana: Pachana refers to digestion of food and metabolic toxins without directly stimulating appetite. Gandhaka, because of its Katu rasa and Ushna nature, aids in digestion of Ama and supports metabolic transformation. Therefore, classical Rasa texts describe Gandhaka as a potent Pachana dravya.

Deepana: Deepana refers to stimulation of Jatharagni and enhancement of appetite. Gandhaka possesses Katu rasa, Ushna virya, and Laghu-Ushna qualities, which collectively enhance digestive fire. This makes Gandhaka useful in conditions associated with Agnimandya and reduced appetite.

Saran Karma: Due to its Sara guna, Gandhaka facilitates downward movement of Vata and expulsion of fecal matter after digestion. This action is termed Saran karma or Anulomana. In modern medicine, this corresponds to the mild laxative effect of sulphur.

Shoshana : Shoshana refers to absorption and drying action. Gandhaka promotes proper absorption by maintaining digestive efficiency through Deepana and Pachana actions. Additionally, its therapeutic role in skin disorders helps maintain normal skin physiology, thereby supporting Shoshana karma.

10. Systemic effect and Uses of Gandhaka

11. Grahya Lakshana (Acceptable Characteristics)

12. Gandhaka Dosha (Impurities)31

13. Effects of Ashuddha Gandhaka

14. Gandhaka Shodhana (Purification)

15. Classical Methods of Shodhana

Table: 4. Shodhana Methods Across Texts

16. Gandhaka Gandhanashana method

17. Gandhaka Satvapatana

18. Therapeutic Uses

19. Dose and Anupana

20. Pathya and Apathya

B. Modern Review of Sulphur (Gandhaka)

1. Historical Background of Sulphur44

2. Physical and Chemical Properties45

3. Forms of Sulphur46

4. Toxicological Profile47

5. Sulphur Allergy48

6. Biological Activity

CONCLUSION:

4. Synonyms of Gandhaka:^26,27,28

Guna: Among the twenty classical qualities, Gandhaka is specifically described as possessing Sara guna in texts such as *Bhava Prakasha, Ananda Kanda**,* and Rasa Tarangini. Sara guna is responsible for promoting movement and facilitating elimination.

Saran Karma: Due to its *Sara guna**, Gandhaka* facilitates downward movement of Vata and expulsion of fecal matter after digestion. This action is termed Saran karma or Anulomana. In modern medicine, this corresponds to the mild laxative effect of sulphur.

12. Gandhaka Dosha (Impurities)³¹

**Table: 4. Shodhana Methods Across Texts**

B. **Modern Review of Sulphur (Gandhaka)**

1. Historical Background of Sulphur⁴⁴

2. Physical and Chemical Properties⁴⁵

3. Forms of Sulphur⁴⁶

4. Toxicological Profile⁴⁷

5. Sulphur Allergy⁴⁸