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=== ''Vidhi Vimarsha'' ===
 
=== ''Vidhi Vimarsha'' ===
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1. The order of sections-
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==== The order of sections ====
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The order in which various sthana (sections) of Charaka samhita are arranged is also significant. Chikitsa Sthana is placed after Indriya Sthana. Indriya Sthana describes the signs and symptoms which indicate certain death of a person. The treatment in such conditions results in failure. Therefore, it must be avoided. The treatment in such conditions should be continued with proper knowledge and also with due consent. After describing limitations of treatment in Indriya Sthana, Chikitsa Sthana describes successful treatment of rest of conditions.
 
The order in which various sthana (sections) of Charaka samhita are arranged is also significant. Chikitsa Sthana is placed after Indriya Sthana. Indriya Sthana describes the signs and symptoms which indicate certain death of a person. The treatment in such conditions results in failure. Therefore, it must be avoided. The treatment in such conditions should be continued with proper knowledge and also with due consent. After describing limitations of treatment in Indriya Sthana, Chikitsa Sthana describes successful treatment of rest of conditions.
2. Different levels of treatment-
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==== Different levels of treatment ====
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According to Ayurveda, the life is conglomeration of four factors namely shareera (the body made up of five Mahabhootas), indriya (the sensory faculty), sattva or mana (mind) and atma (the soul).  On this basis, disease is also studied at different levels. Therefore, the treatment also is performed at different levels. After initial treatment for relief, Ayurveda describes prayoga (long term treatment for complete cure) and apunarbhava chikitsa (treatment which prevents recurrence of the disease)  to maintain and promote health, rasayana is given.
 
According to Ayurveda, the life is conglomeration of four factors namely shareera (the body made up of five Mahabhootas), indriya (the sensory faculty), sattva or mana (mind) and atma (the soul).  On this basis, disease is also studied at different levels. Therefore, the treatment also is performed at different levels. After initial treatment for relief, Ayurveda describes prayoga (long term treatment for complete cure) and apunarbhava chikitsa (treatment which prevents recurrence of the disease)  to maintain and promote health, rasayana is given.
3. Various aspects of chikitsa (treatment)-
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==== Various aspects of chikitsa (treatment) ====
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At the beginning of the chapter, various aspects of treatment are explained by using various synonyms. Chikitsita are means for curing disease. Pathya means specific wholesome diet and regimens which will help to cure disease, it also means that which maintains normalcy of srotas (channels for transportation and transformation of nutrients in the destined body constituent). Sadhana means various instruments and procedures helpful for successful treatment. Aushadha are medicines obtained from herbs. Prayashchitta means the redressal for diseases originating from previous deeds of the person. Prashamana is that which leads to complete cure. Prakriti (specific constitution of a person) makes him prone for certain diseases. Prakritisthapana helps to protect a person from them by maintaining balance of all three Doshas. Hita is that which helps to make dhatus stable and protect them from diseases. (verse 3)
 
At the beginning of the chapter, various aspects of treatment are explained by using various synonyms. Chikitsita are means for curing disease. Pathya means specific wholesome diet and regimens which will help to cure disease, it also means that which maintains normalcy of srotas (channels for transportation and transformation of nutrients in the destined body constituent). Sadhana means various instruments and procedures helpful for successful treatment. Aushadha are medicines obtained from herbs. Prayashchitta means the redressal for diseases originating from previous deeds of the person. Prashamana is that which leads to complete cure. Prakriti (specific constitution of a person) makes him prone for certain diseases. Prakritisthapana helps to protect a person from them by maintaining balance of all three Doshas. Hita is that which helps to make dhatus stable and protect them from diseases. (verse 3)
4. Benefits of rasayana-
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==== Benefits of rasayana ====
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Rasayana produces best quality of dhatus (body tissues). Various benefits of using rasayana are described. Long and healthy life, maintainance of youth and prevention of ageing, great bala (a broad trem, which includes physical, mental strength and  immunity) are obtained by rasayana. Excellence of lusture, complexion of skin and beauty, excellence of voice, enhanced capacity of senses, power of memory and intelligence are obtained.  
 
Rasayana produces best quality of dhatus (body tissues). Various benefits of using rasayana are described. Long and healthy life, maintainance of youth and prevention of ageing, great bala (a broad trem, which includes physical, mental strength and  immunity) are obtained by rasayana. Excellence of lusture, complexion of skin and beauty, excellence of voice, enhanced capacity of senses, power of memory and intelligence are obtained.  
 
Vak Siddhi is a power by which whatever the person speaks, becomes true. Pranati is reverence from people. By use of rasayana, the person gets physical strength, mental abilities and power of intellect and memory. So, whatever the person speaks, he has the capacity to practically act accordingly. Also, he speaks only the truth. So, his words come true. Because of such good qualities, he gets reverence from people. (verse 7,8)
 
Vak Siddhi is a power by which whatever the person speaks, becomes true. Pranati is reverence from people. By use of rasayana, the person gets physical strength, mental abilities and power of intellect and memory. So, whatever the person speaks, he has the capacity to practically act accordingly. Also, he speaks only the truth. So, his words come true. Because of such good qualities, he gets reverence from people. (verse 7,8)
5. Benefits of vajeekarana- (verse 9-12)
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==== Benefits of vajikarana (verse 9-12) ====
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a) Apatyasantanakara- Not only the person using vajeekarana will have progeny, but even his further generations also won’t have infertility, so effects of vajeekarana are capable of making genetic changes
 
a) Apatyasantanakara- Not only the person using vajeekarana will have progeny, but even his further generations also won’t have infertility, so effects of vajeekarana are capable of making genetic changes
 
           b) Sadya Sampraharshana- produces erection instantly
 
           b) Sadya Sampraharshana- produces erection instantly
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           m) Success, wealth and prosperity, strength, robustness  
 
           m) Success, wealth and prosperity, strength, robustness  
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6. Two modes of administration of rasayana- ( verse 1.1.16)
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==== Two modes of administration of rasayana (verse 1.1.16) ====
           Rasayana can be used by two methods.  
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           Kuti praveshika- The person stays in a kuti (specially built house) for a specific   period and uses rasayana.
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Rasayana can be used by two methods.  
           Vatatapika- The person continues with his routine activities, while using rasayana.
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7. Construction of a Kuti (hut)( verse 1.1.16-20)
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Kuti praveshika- The person stays in a kuti (specially built house) for a specific period and uses rasayana.
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Vatatapika- The person continues with his routine activities, while using rasayana.
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==== Construction of a Kuti (hut) (verse 1.1.16-20) ====
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The place- Kuti is built at a place near city or town, i.e. in civilised place, near the place of king or government officials for legal issues, permissions, near place of vaidyas (phycisians) for advice of other senior vaidyas whenever required, where advice of experts in other fields of knowledge is available, place of well cultured gentlemen , decent place with social security, with availability of necessary instruments, equipments and amenities, located in east or north, for proper light and ventilation, selected as per the bhoomi pareeksha ( selection of good land) as described in Charaka samhita Kalpasthana 1st chapter,  
 
The place- Kuti is built at a place near city or town, i.e. in civilised place, near the place of king or government officials for legal issues, permissions, near place of vaidyas (phycisians) for advice of other senior vaidyas whenever required, where advice of experts in other fields of knowledge is available, place of well cultured gentlemen , decent place with social security, with availability of necessary instruments, equipments and amenities, located in east or north, for proper light and ventilation, selected as per the bhoomi pareeksha ( selection of good land) as described in Charaka samhita Kalpasthana 1st chapter,  
 
Structre and design- is decided by experts in that field, but the specific requirements are mentioned in this chapter like- – with proper height ,width, with three concentric courts, having small windows on height, having thick walls, comfortable for all seasons, spacious, with proper lighting, pleasant for stay, protected from sound pollution ,other pollutions and unwanted sounds, smells etc., where celibacy can be maintained, equipped with necessary instruments, equipments and amenities, having on duty vaidyas, consulting vaidyas and consultants in other fields. The following pictures can give an idea regarding this-
 
Structre and design- is decided by experts in that field, but the specific requirements are mentioned in this chapter like- – with proper height ,width, with three concentric courts, having small windows on height, having thick walls, comfortable for all seasons, spacious, with proper lighting, pleasant for stay, protected from sound pollution ,other pollutions and unwanted sounds, smells etc., where celibacy can be maintained, equipped with necessary instruments, equipments and amenities, having on duty vaidyas, consulting vaidyas and consultants in other fields. The following pictures can give an idea regarding this-
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8. Entering the kuti- The specific way of entering the kuti is described in the text. Not only by using specific purificatory methods, the body pf the person is prepared for the effects of rasayana, but he is also prepared mentally. The person gets extraordinary qualities due to rasayana. But he may use them only for his personal benefits and may harm others in the society. For this he is convinced to use his qualities for the benefit of the whole society. He also resolves to properly complete the procedure, as seization of the procedure on midway may be harmful for health.
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==== Entering the kuti ====
9. Quality control in selection of medicines- (verse 1.1. 38-40)
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The specific way of entering the kuti is described in the text. Not only by using specific purificatory methods, the body pf the person is prepared for the effects of rasayana, but he is also prepared mentally. The person gets extraordinary qualities due to rasayana. But he may use them only for his personal benefits and may harm others in the society. For this he is convinced to use his qualities for the benefit of the whole society. He also resolves to properly complete the procedure, as seization of the procedure on midway may be harmful for health.
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==== Quality control in selection of medicines (verse 1.1. 38-40) ====
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a) Bhoomi pariksha (criteria to select good land for collection of medicines) as described in Charakasamhita Kalpasthana 1.9, should be followed.
 
a) Bhoomi pariksha (criteria to select good land for collection of medicines) as described in Charakasamhita Kalpasthana 1.9, should be followed.
 
b) Especially haritaki (Terminalia chebula) and amalaki ( Emblica officinalis) used as rasayana in this chapter are preferably collected from the range of mountain Himalaya.
 
b) Especially haritaki (Terminalia chebula) and amalaki ( Emblica officinalis) used as rasayana in this chapter are preferably collected from the range of mountain Himalaya.
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h) Free from toxicity
 
h) Free from toxicity
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10. Abhayamalakeeya pada
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==== Abhayamalakeeya pada ====
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This part of the chapter deals with rasayana prepared from Haritaki (Terminalia chebula) and amalaki (Emblica officinalis) as the name suggests. These are the first two rasayana mentioned in this chapter denoting their importance.  
 
This part of the chapter deals with rasayana prepared from Haritaki (Terminalia chebula) and amalaki (Emblica officinalis) as the name suggests. These are the first two rasayana mentioned in this chapter denoting their importance.  
11. Haritaki rasayana- (verse 1.1.29-32)
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Haritaki pacifies kapha and pitta. It performs anulomana of vata i.e. helps to maintain normal movements of vata. It moves out the accumulated dosha and mala, thus helps to maintain patency and proper functions of srotas. It also activates dhatvagni. Although haritaki is not directly providing nourishment to dhatus (body tissues), but due to to proper function of srotas, removes obstructions and helps the nutrients to reach to the dhatus. Also by activating dhatvagni, it helps in proper conversion of nutrients into dhatus. Because of these actions, haritaki is very important rasayana  
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==== Haritaki rasayana (verse 1.1.29-32) ====
12. Amalaki rasayana- (verse 1.1.36-37)
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Most of the qualities and actions of amalaki are similar to haritaki. But amalaki is sheeta Veerya, whereas haritaki is ushna veerya.  
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Haritaki pacifies kapha and pitta. It performs anulomana of vata i.e. helps to maintain normal movements of vata. It moves out the accumulated dosha and mala, thus helps to maintain patency and proper functions of srotas. It also activates dhatvagni. Although haritaki is not directly providing nourishment to dhatus (body tissues), but due to to proper function of srotas, removes obstructions and helps the nutrients to reach to the dhatus. Also by activating dhatvagni, it helps in proper conversion of nutrients into dhatus. Because of these actions, haritaki is very important rasayana.
13. Rasayana in the 1st Pada-
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==== Amalaki rasayana (verse 1.1.36-37) ====
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Most of the qualities and actions of amalaki are similar to haritaki. But amalaki is sheeta Veerya, whereas haritaki is ushna veerya.  
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==== Rasayana in the first Pada ====
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The first part of this chapter mentions 6 rasayana, namely Brahma rasayana, Chyavanaprasha, Amalaka rasayana, Haritaki rasayana and 6th rasayana (a combination of both haritaki and amalaki). The contents and procedures for preparation of each of these rasayana is mentioned in the text. Commentator Gangadhara has given further details about steps in actual preparation. Apart from the commonly described benefits of rasayana, at the beginning of the chapter, each rasayana has got certain specific benefits. A Vaidya selects a rasayana for a person considering mode of action of rasayana, based on qualities and actions, and based on specific benefits of that rasayana.  
 
The first part of this chapter mentions 6 rasayana, namely Brahma rasayana, Chyavanaprasha, Amalaka rasayana, Haritaki rasayana and 6th rasayana (a combination of both haritaki and amalaki). The contents and procedures for preparation of each of these rasayana is mentioned in the text. Commentator Gangadhara has given further details about steps in actual preparation. Apart from the commonly described benefits of rasayana, at the beginning of the chapter, each rasayana has got certain specific benefits. A Vaidya selects a rasayana for a person considering mode of action of rasayana, based on qualities and actions, and based on specific benefits of that rasayana.  
14. Brahma rasayana-
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===== Brahma rasayana =====
 
This rasayana is prepared with haritaki fruits 1000 in number and amalaki fruits 3000 in number, with 25 other medicines used for kvatha (decoction) and 14 other medicines used for kalka (in the form of paste). Specially this rasayana, apart from general benefits of rasayana, is described as useful for removing tandra (drowsiness), klama ( lassitude), shvasa (dyspnea). It also boosts intelligence and memory. These benefits of this rasayana, are because it ignites agni, performs digestion of ama, therefore improves the quality of rasa. Also since it eliminates accumulated malas from the body and performs pachana of ama, srotas become clear and patent. Thus, tamoguna is reduced and sattva guna increases.  
 
This rasayana is prepared with haritaki fruits 1000 in number and amalaki fruits 3000 in number, with 25 other medicines used for kvatha (decoction) and 14 other medicines used for kalka (in the form of paste). Specially this rasayana, apart from general benefits of rasayana, is described as useful for removing tandra (drowsiness), klama ( lassitude), shvasa (dyspnea). It also boosts intelligence and memory. These benefits of this rasayana, are because it ignites agni, performs digestion of ama, therefore improves the quality of rasa. Also since it eliminates accumulated malas from the body and performs pachana of ama, srotas become clear and patent. Thus, tamoguna is reduced and sattva guna increases.  
 
While the second brahma rasayana is prepared with amalaki fruits 1000 in number triturated in the juice of 1000 amalaki fruits. With addition of 23 other medicines and bhasma (specific form which can be absorbed and assimilated in the body) of gold, silver, copper, praval and iron. Because of such ingredients, it specifically provides great physical strength, and also power of Indriya (sensory faculty) is enhanced. Also the body develops the capacity to counteract the effects of poisons.
 
While the second brahma rasayana is prepared with amalaki fruits 1000 in number triturated in the juice of 1000 amalaki fruits. With addition of 23 other medicines and bhasma (specific form which can be absorbed and assimilated in the body) of gold, silver, copper, praval and iron. Because of such ingredients, it specifically provides great physical strength, and also power of Indriya (sensory faculty) is enhanced. Also the body develops the capacity to counteract the effects of poisons.
15. Chyavanaprasha Rasayana-
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===== Chyavanaprasha Rasayana =====
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Chyanaprasha is prepared from the pulp of amalaki fruits 500 in number, with addition of 36 other medicines used for kvatha (decoction) and fine powders of four other medicines added at the end. It is specifically useful for maintaining youth and vigour. It helps to build body tissues in children, old and emaciated persons. Ignites agni and Improves beauty. Also useful in disorders of voice, diseases of chest, heart diseases, and disorders of urinary tract and genital organs.  
 
Chyanaprasha is prepared from the pulp of amalaki fruits 500 in number, with addition of 36 other medicines used for kvatha (decoction) and fine powders of four other medicines added at the end. It is specifically useful for maintaining youth and vigour. It helps to build body tissues in children, old and emaciated persons. Ignites agni and Improves beauty. Also useful in disorders of voice, diseases of chest, heart diseases, and disorders of urinary tract and genital organs.  
16. Diseases from changing lifestyle and importance of rasayana-
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==== Diseases from changing lifestyle and importance of rasayana ====
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The second quarter strarts with description of changing lifestyle and the resultant disorders. It is described that with their healthy lifestyle the ancient sages were free from diseses. But diseases originated due to urbanization and thereby changing lifestyle.
 
The second quarter strarts with description of changing lifestyle and the resultant disorders. It is described that with their healthy lifestyle the ancient sages were free from diseses. But diseases originated due to urbanization and thereby changing lifestyle.
This description is even more important in present era, because many of the dietary articles and the activities mentioned here have become common now like more consumption of salt, sour and pungent items, sprouted grains, dried vegetables and meat, sleeping in day time, irregular timings of meals, irregular improper and excessive exercises and physical activities, using unhealthy combinations like milk with salty and sour items, or milk with fruits, continuously affected by anger, grief, greed fear like mental states etc. This results in diseases with laxity in muscles, muscular dystrophies etc., diseases of bone marrow, joint disorders, impotency and infertility and so on.  
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This description is even more important in present era, because many of the dietary articles and the activities mentioned here have become common now like more consumption of salt, sour and pungent items, sprouted grains, dried vegetables and meat, sleeping in day time, irregular timings of meals, irregular improper and excessive exercises and physical activities, using unhealthy combinations like milk with salty and sour items, or milk with fruits, continuously affected by anger, grief, greed fear like mental states etc. This results in diseases with laxity in muscles, muscular dystrophies etc., diseases of bone marrow, joint disorders, impotency and infertility and so on.  
 
It is described that by following proper healthy lifestyle and by the use of rasayana, one can get freedom from such diseases. Therefore, thourough study and application of rasayana is needed in the present era.
 
It is described that by following proper healthy lifestyle and by the use of rasayana, one can get freedom from such diseases. Therefore, thourough study and application of rasayana is needed in the present era.
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==== Rasayana in the second pada ====
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In the second quarter 37 rasayana have been described. The name Pranakameeya suggests desire or quest for living i.e. desire for longevity. For this purpose, rasayana prepared mainly from amalaki are described.
 
In the second quarter 37 rasayana have been described. The name Pranakameeya suggests desire or quest for living i.e. desire for longevity. For this purpose, rasayana prepared mainly from amalaki are described.
Nagabala rasayana, as the name suggests provides strength and stability to body tissues. The same method of using nagabala as rasayana described here is applicable for using 10 other rasayana enlisted from bala to punarnava.
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Bhallataka rasayana is extremely ushna-teekshna due to which it is used in kapha dominant conditions, or where kapha obstructs movements of vata. Also, to remove obstruction in srotas and fascilitate conduction and conversions going on in srotas. Bhallataka is also excellent rasayana for igniting functions of agni. It also increases intelligence, as it removes tamoguna (which is responsible for inhibition). 10 specific formulations of bhallataka are described, which can be used as rasayana . Although bhallataka is very potent, it can result in unwanted effects, when improperly used. Therefore, the precautions to be taken while using it, are mentioned in the text.
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===== Nagabala rasayana =====
The third quarter is named as Karaprachitiya because the first rasayana mentioned here is prepared from amalaki fruits plucked by hands. In all 16 rasayana are described. Apart from rasayanas prepared from amalaki, there is lauhadi rasayana. Special benefits of this rasayana include increased physical strength, enhanced capacity of Indriya (senses), body becomes capable of sustaining injuries and wounds heal quickly. This is because loha (Iron) provides bala (strength) to rakta. Also loha being dominated by Prithvi Mahabhoota, provides strength to parthiva body constituents like asthi ( ~ osseous tissue)  
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Medhya Rasayana- These four Rasayana enhance intelligence. Yashtimadhu is sheeta, pacifies vata-pitta and maintains normal kapha. It controls rajoguna and increases sattva, resulting in boosting intelligence. Yashtimadhu also nourishes dhatus and ultimately increases shukra and oja. As explained by commentator Chakrapani, effects on Indriya, mana and buddhi are mediated through oja. Mandukaparni is sheeta and it specially pacifies pitta. It also controls rajoguna and increases sattva. Shankhapushpi is slightly ushna, specially pacifies vata. Shankhapushpi also controls rajoguna and increases sattva. Shankhapushpi nourishes majja. Whereas guduchi is also slightly ushna, pacifies all three doshas, controls tama and increases sattva. Keeping in mind such peculiarities, specific rasayana is chosen for a specific person. Many researches have been conducted on these medhya rasayana.(Ray and Ray, 2015)  
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As the name suggests provides strength and stability to body tissues. The same method of using nagabala as rasayana described here is applicable for using 10 other rasayana enlisted from bala to punarnava.
Triphala Rasayana-
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===== Bhallataka rasayana =====
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This is extremely ushna-teekshna due to which it is used in kapha dominant conditions, or where kapha obstructs movements of vata. Also, to remove obstruction in srotas and fascilitate conduction and conversions going on in srotas. Bhallataka is also excellent rasayana for igniting functions of agni. It also increases intelligence, as it removes tamoguna (which is responsible for inhibition). 10 specific formulations of bhallataka are described, which can be used as rasayana . Although bhallataka is very potent, it can result in unwanted effects, when improperly used. Therefore, the precautions to be taken while using it, are mentioned in the text.
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==== Rasayana in the third pada ====
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The third quarter is named as Karaprachitiya because the first rasayana mentioned here is prepared from amalaki fruits plucked by hands. In all 16 rasayana are described. Apart from rasayanas prepared from amalaki, there is lauhadi rasayana. Special benefits of this rasayana include increased physical strength, enhanced capacity of Indriya (senses), body becomes capable of sustaining injuries and wounds heal quickly. This is because loha (Iron) provides bala (strength) to rakta. Also loha being dominated by Prithvi Mahabhoota, provides strength to parthiva body constituents like asthi ( ~ osseous tissue) .
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===== Medhya Rasayana =====
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These four Rasayana enhance intelligence. Yashtimadhu is sheeta, pacifies vata-pitta and maintains normal kapha. It controls rajoguna and increases sattva, resulting in boosting intelligence. Yashtimadhu also nourishes dhatus and ultimately increases shukra and oja. As explained by commentator Chakrapani, effects on Indriya, mana and buddhi are mediated through oja. Mandukaparni is sheeta and it specially pacifies pitta. It also controls rajoguna and increases sattva. Shankhapushpi is slightly ushna, specially pacifies vata. Shankhapushpi also controls rajoguna and increases sattva. Shankhapushpi nourishes majja. Whereas guduchi is also slightly ushna, pacifies all three doshas, controls tama and increases sattva. Keeping in mind such peculiarities, specific rasayana is chosen for a specific person. Many researches have been conducted on these medhya rasayana.(Ray and Ray, 2015)  
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===== Triphala Rasayana =====
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Triphala a combination of haritaki, amalaki and bibhitaka is one of the most important medicines in Ayurveda. Its an important rasayana also. Triphala mainly pacifies kapha and pitta.  By removing obstruction to its movements, it helps to maintain proper actions of vata. It improves the functions of dhatvagnii to digests ama and eliminates abnormally accumulated mala and doshas, therefore makes the srotas clear and patent to enable nutrients to reach dhatus. It also controls meda which helps to maintain balance in all the dhatus, because abnormally increased meda blocks nutrition of other dhatus and produces imbalance.  
 
Triphala a combination of haritaki, amalaki and bibhitaka is one of the most important medicines in Ayurveda. Its an important rasayana also. Triphala mainly pacifies kapha and pitta.  By removing obstruction to its movements, it helps to maintain proper actions of vata. It improves the functions of dhatvagnii to digests ama and eliminates abnormally accumulated mala and doshas, therefore makes the srotas clear and patent to enable nutrients to reach dhatus. It also controls meda which helps to maintain balance in all the dhatus, because abnormally increased meda blocks nutrition of other dhatus and produces imbalance.  
Shilajatu-
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===== Shilajatu =====
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Being katu-tikta and ushna, shilajatu pacifies kapha. It also helps in digestion of ama. Therefore, removes obstruction and helps normal movements of vata. It controls formation of meda. Abnormal meda blocks nutrition of other dhatus. Shilajatu, by controlling formation of meda, regulates genesis of all the dhatus. In the conditions originating from ati santarpana, i.e. when dhatus are provided excessive nourishment, but proper transformation of these nutrients in the dhatus is not done, Shilajatu is very effective. But in the conditions due to ati Apatarpana i.e. when proper nourishment is not available for the genesis of dhatus, shiljatu is not the rasayana of choice.  
 
Being katu-tikta and ushna, shilajatu pacifies kapha. It also helps in digestion of ama. Therefore, removes obstruction and helps normal movements of vata. It controls formation of meda. Abnormal meda blocks nutrition of other dhatus. Shilajatu, by controlling formation of meda, regulates genesis of all the dhatus. In the conditions originating from ati santarpana, i.e. when dhatus are provided excessive nourishment, but proper transformation of these nutrients in the dhatus is not done, Shilajatu is very effective. But in the conditions due to ati Apatarpana i.e. when proper nourishment is not available for the genesis of dhatus, shiljatu is not the rasayana of choice.  
 
The fourth quarter describes mainly two types of rasayana told by Indra and about soma as rasayana.  
 
The fourth quarter describes mainly two types of rasayana told by Indra and about soma as rasayana.  
Achara Rasayana- (rasayana effects of good conduct)
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==== Achara Rasayana (rasayana effects of good conduct) ====
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Another important aspect of the fourth quarter is achara rasayana. Good conduct like speaking truth, non violence, compassion etc. is considered very much important to obtain benefits of any rasayana described here.  
 
Another important aspect of the fourth quarter is achara rasayana. Good conduct like speaking truth, non violence, compassion etc. is considered very much important to obtain benefits of any rasayana described here.  
17. Vaidya-
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==== Vaidya ====
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For experts of Ayurveda, the term ‘vaidya’ is used, which means one having proper knowledge. A vaidya may be of any cast, race etc. by birth, it doesn’t matter. Because it is said, that when he completes his education in Ayurveda, he is as if reborn. He is like guardian of life. Therefore, deserves respect from the society.  
 
For experts of Ayurveda, the term ‘vaidya’ is used, which means one having proper knowledge. A vaidya may be of any cast, race etc. by birth, it doesn’t matter. Because it is said, that when he completes his education in Ayurveda, he is as if reborn. He is like guardian of life. Therefore, deserves respect from the society.  
 
A vaidya has to care for the patients as if they were his children or family members. A Vaidya, by practicing with compassion towards the ailing, earns much more than wealth. Therefore, a vaidya should not consider treatment as a business. This advice of Charakasamhita holds true even today. Those who serve patients with this attitude, get such benefits from the society, which no other profession can get, and unmatched as compared to wealth.
 
A vaidya has to care for the patients as if they were his children or family members. A Vaidya, by practicing with compassion towards the ailing, earns much more than wealth. Therefore, a vaidya should not consider treatment as a business. This advice of Charakasamhita holds true even today. Those who serve patients with this attitude, get such benefits from the society, which no other profession can get, and unmatched as compared to wealth.
Potential areas for future research:
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=== Potential areas for future research ===
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1. Rasayana Tantra is one of the Eight important branches of Astanga Ayurveda. It deals with an important category of medicinal and non-medicinal rejuvenative remedies advocated for promotive and preventive health care including retarding aging and promoting longevity.
 
1. Rasayana Tantra is one of the Eight important branches of Astanga Ayurveda. It deals with an important category of medicinal and non-medicinal rejuvenative remedies advocated for promotive and preventive health care including retarding aging and promoting longevity.
 
These remedies are claimed to improve the quality of cells and tissues (even the genes) of the body through following mechanisms:
 
These remedies are claimed to improve the quality of cells and tissues (even the genes) of the body through following mechanisms: