Therapeutic effectiveness of Brahmi capsule

January 6, 2024

An observational study to assess the therapeutic effectiveness of Brahmi capsule as experienced by the Ayurveda physicians across India during their clinical practice.

 

  1. Dr Anoop AK, Deputy Physician, Clinical research
  2. Dr.Ramesh.P.R, Chief Clinical research, Arya Vaidya Sala Kottakkal
  3. Dr Arjun M K, Deputy Physician, Arya Vaidya Sala Kottakkal
  4. K.P. Nair, Arya Vaidya Sala Kottakkal
  5. P.Venugopalan, Arya Vaidya Sala Kottakkal
  6. T.Jayaraj, Arya Vaidya Sala Kottakkal

 

Abstract

Brahmi (Bacopa monnieri) is a traditional herbal medicine that has been in use since the time of the Vedic civilization for cognitive problems. Today the prevalence of Alzheimer’s disease among adults (almost 15% of adults of age 65 and above) and learning difficulties among children (between 5 to 15% among school going children) have grown exponentially high. As a result the usage of Ayush drugs related to adult and child psychological disabilities is  getting more preference and among them Brahmi maintains its popularity as the most widely used brain tonic in the present era also.

Brahmi capsule is used for improving concentration and for managing the problems related to cognitive functions and speech. It is manufactured by Arya Vaidya Sala Kottakkal, Kerala in the form of capsules which contain 250 mg extract of Brahmi. For assessing the effectiveness and added benefits of it a cross sectional study was done among 220 Ayurvedic physicians who are using Brahmi capsule in their practice on a regular basis. Majority (202) of the physicians opined that they have used the medicine in all of the above mentioned indications either always or occasionally. Brahmi, which is described as Medhya(improves intellect), may directly work on micro-faculties such as Dhi( intelligence), Dhriti (retaining power of mind )and Smriti(memory) and thus helps in treating behavioral issues and learning difficulties. Bacosides are the triterpenoid saponins of prime importance which is found in Brahmi and they have shown the capacity to enhance nerve impulse transmission. The bacosides also promote the repair of damaged neurons by up-regulating neuronal synthesis and kinase activity. The bacosides also aid in the restoration of synaptic activity, which ultimately leads to proper nerve impulse transmission.

Brahmi capsule is also found to be effective in many conditions like anxiety, tremors, depression related to diabetes, post-surgical fine movement impairment, epilepsy, stammering etc. The present article is based on the survey conducted among the Ayurveda physicians in different parts of India, to assess the effectiveness and additional benefits observed during their clinical practice with Brahmi capsule.

 Key words-Brahmi, Medhya, Bacosides, Swarya, Dhi

 

Section 1- Introduction

A person’s behavior is decided by a combination of factors like intelligence, memory, self-control and sound mental health etc. Each year, almost 15% of adults, of age 65 and above who have mild cognitive impairment develop Alzheimer’s disease over a period of time1. Learning disabilities are neurodevelopmental conditions that impair a person’s capacity for information acquisition, processing, or usage. Learning difficulties are a major problem for children in India and many other nations also. However, estimating the precise frequency of learning disorders can be difficult due to a number of factors, including different classifications, diagnostic standards, and study methodology. Various research have produced varying estimates of the prevalence of learning difficulties in India and according to several studies, the prevalence among school going children is between 5% to 15%.2

Brahmi (Bacopa monnieri) is a traditional herbal medicine that has been used by humans since the time of the Vedic civilization. Its native habitat is marshy places and it is a member of the Scrophulariaceae family. The Sanskrit term Brahmi is derived from Lord Brahma, the Hindu god of creation.

Brahmi maintains its popularity as the most widely used brain tonic and home remedy in the present era also. The consumers of this raw drug include children (even of neonatal age) to nonagenarians. Nowadays drugs related to child psychology or those which corrects learning disabilities is getting higher preference, and the whole world is reluctantly accepting the ancient wisdom  of Ayurveda for enhancing memory, intelligence and cognitive functions.

Kashyapa samhita which is the prime text on Koumarabritya (Pediatrics) has given
Brahmi an important place among all Medhya drugs. In the available portion of
Kashyapa Samhita, Brahmi is mentioned in the first chapter, i.e. Lehaadhyaya.

Brahmi (Bacopa monnieri) is selected for the study here primarily due to its Medhya properties but it also shows Mehaghna (anti-diabetic) and Rasayana (rejuvenation) properties along with it. Several studies have also shown its multi-systemic action also.

Brahmi capsule of Arya Vaidya Sala, Kottakkal is prepared in the form of a capsule which contains 250 mg extract of the drug. It is found that Brahmi capsule helps in improving the concentration, intelligence and memory. It is also observed that Brahmi capsule helps to improve speech and sleep. For assessing the effectiveness and added benefits, a cross sectional study was done among 220 Ayurvedic physicians who are using Brahmi capsule in their practice on a regular basis.

The article has been organized in different sections as follows

 Section-1- A brief introduction

Section 2- Methodology

Section 3- Observation, Analysis and interpretation of the survey

Section 4- Discussion

Section 5- Conclusion

 

Section 2- Methodology

Objective

To assess the effectiveness and added benefits of Brahmi Capsule

Materials:

Review of Literature: Compilation of references on Brahmi from Ayurvedic classics and journals.

Primary resources:

Bruhattrayi, laghutrayi with available commentaries, classical texts like Bhava prakasha Nighantu and Kayyadeva Nighantu etc.

Secondary resources:

Relevant modern literature, previous research works, MD and PhD theses, journals, published research papers and subject related data which is available online etc.

Developed questionnaire-Done face validity- Initially a questionnaire was developed and took expert suggestions. More than 90% of the contents were agreed by the clinical experts with more than 25 years of experience.

Methods

Plan of the study

Literature review of Brahmi –> Development of the questionnaire –>Survey done in different parts of country–> Analysis and conclusion

Primary and secondary resources were reviewed in the light of hypothesis and plan of study and necessary materials were compiled. Compiled materials were thoroughly studied, re-arranged and critically analyzed to provide the logical base for the study.

STUDY DESIGN: Descriptive Cross sectional study

STUDY POPULATION: In the present study, physicians practicing Ayurveda in different parts of India.

INCLUSION CRITERIA:

Age group:  25 – 80 years

Sex: Both sex included.

EXCLUSION CRITERIA:

Physicians who are not willing to participate.

SAMPLE SIZE:

It was calculated by using the following formula:

Z1-α/2        =       1.96

P            =       60 %

d            =       7 %

Expecting 60% prevalence of effectiveness of Brahmi capsule and considering a 7% margin of precision, the sample size is calculated as 196. Considering a drop out of 10%, the total sample size is considered as 215.

Conduct of survey: Survey was conducted by sending a request form and brief introduction about the study to the participants in the form of a google form.

DATA COLLECTION: Primary collection of data with a structured questionnaire though Google form

STATISTICAL ANALYSIS

Cross sectional study- Prevalence will be published in terms of frequency, percentage and Cumulative Percent. Diagrammatic representation of data by tables and figures like Pie diagram and bar diagram etc.

Sub analysis- Crosstabs, Chi-square.

 

Section-3-OBSERVATION, ANALYSIS and INTERPRETATIONS

  1.  Clinical experience
 
Table 1 – Clinical Experience in years
Frequency Percent Valid Percent Cumulative Percent
Valid 1-10 Years 66 22.8 29.5 29.5
11-20 years 91 32.3 41.8 71.4
21-30 years 41 14.4 18.6 90.0
More than 30 years 22 7.7 10.0 100.0
Total 220 77.2 100.0

Figure-1 – Clinical Experience in years

Out of 220 responses, 91(32.3%) physicians having 11-20 years of experiences. 41(15%) having more than 20 years. 22(8%) physicians having more than 30 years of experiences. Out of 220 physicians, 154(70.45%) physicians having more than 10 years of experiences.63 physicians having more than 20 years of experience.

Cross tabulation

Table-2-Clinical Experience in years and Effectiveness of Brahmi capsule
Count
Effectiveness of Brahmi capsule Total
Mild Moderate Very Effective
Clinical Experience in years 1-10 Years 3 28 35 66
11-20 years 6 30 55 91
21-30 years 3 18 20 41
More than 30 years 0 11 11 22
Total 12 87 121 220

The cross tab shows that the effectiveness of Brahmi capsule and the clinical experience as follows. Out of 220 doctors, 121 physicians responded that Brahmi capsule is very effective and 87 doctors opined that it is moderately effective in its indications. 70.45%(154) of physicians having more than 10 years of experience suggested that Brahmi capsule is very effective in the management of memory dysfunction and other indications. (Very effective-action within 21 days, moderately effective-35 days, mildly effective-50 days or more)

 

 

Table-3-Chi-Square Tests
Value Df Asymp. Sig. (2-sided)
Pearson Chi-Square 17.800a 6 .007

The test for association of Effectiveness of Brahmi capsule and Clinical Experience in years got significant association with a P value 0.007(<.05).

 

  1. Usage of Brahmi capsule in clinical practice

 

 Table-4-Frequency of Brahmi capsule in clinical practice
Frequency Percent Valid Percent Cumulative Percent
Valid Never 1 .4 .5 .5
Rarely 17 6.0 7.7 8.2
Occasionally 103 36.1 46.8 55.0
Always 99 34.7 45.0 100.0
Total 220 77.2 100.0

Out of 220 respondents, 99 (34.7 %) have reported that Brahmi capsule is used always in their clinical practice. 103 (36.1%) have reported that it is a drug of choice occasionally in their clinical practice. Out of 220 physicians, 202 physicians are using Brahmi capsule in their practice either always or occasionally.( Prescribes brahmi capsule at least once a week -Always, once in two weeks- occasionally, once in a month-rarely)

  1. Figure-2- Usage of Brahmi capsule in clinical practice

 

The Common Indication where Brahmi Capsule is used :

Table 5 : Cross Tabulation

Indications of Brahmi capsule Total
Improving intelligence & concentration(I&C) and memory Improving I&C, memory  and sleep Improving I&C, memory and speech  

 

All indications
 In your clinical practice are you using Brahmi capsule Never 0 0 0 1 1
Rarely 5 5 4 3 17
Occasionally 25 25 29 24 103
Always 24 33 26 16 99
Total 54 63 59 44 220

Majority (202) of the physicians opined that they were using the medicine in all of its proposed indications either always or occasionally. 44 physicians reported that Brhami capsule is effective in all of its indications. 63 physicians responded that it is giving positive result in three of its indications.

 

3) Indications of Brahmi capsule

Clinical Experience in years and  Indications of Brahmi capsule

Table-6- Cross tabulation

Indications of Brahmi capsule Total
Improving intelligence & concentration (I&C) and memory Improving I&C, memory  and sleep Improving I&C, memory and speech  All indications
Clinical Experience in years 1-10 Years 16 15 20 15 66
11-20 years 22 28 20 21 91
21-30 years 10 12 14 5 41
More than 30 years 6 8 5 3 22
Total 54 63 59 44 220

Out of 220 responses, 154 physicians with more than 10 years of experience opined that it is effective in majority of its indications. Out of 4 major indications, 176 physicians responded that it is effective in three of its indications.

 

Table-7-Indications of Brahmi capsule

Indications of Brahmi capsule Observations
Improving concentration &intelligence 184
Memory 184
Improving speech 67
Improving sleep 92
All indications 97
Improving concentration & intelligence and memory 64
Improving concentration & intelligence , memory  and speech 117

Figure-3-Clustered column- Indications of Brahmi capsule

 

 

4) Ideal time of administration of Brahmi Capsule

Table-8- Time of administration of Brahmi Capsule

Empty stomach 37
Before food 16
After Food 64
Bed time 103

 

Figure-4- Ideal time of administration of Brahmi Capsule

 

Ideal time for administration of Brahmi Capsule and Indications of Brahmi capsule

 Table-9-Cross-tabulation

Count
Indications of Brahmi capsule Total
Improving I&C and memory Improving I&C,memory and sleep, Improving

I&C ,memory and speech

All indications
Ideal time for administration of Brahmi Capsule Empty stomach 7 10 14 6 37
Before food 3 6 3 4 16
After Food 15 22 18 9 64
Bed time 29 25 24 25 103
Total 54 63 59 44 220

Cross tabulation shows that majority of the doctors (103-46.8%) opined that ideal time of administration of Brahmi capsule is at bed time. 64(30%) physicians reported that the ideal time of taking Brahmi capsule is after food.

 

5) Anupana

Table-10-Common Anupana

Arista ( Saraswarista) 40
Gritha 38
Ksheeram 86
No Opinion 25
Luke warm water 10

 

Figure-5

Anupana and Indications of Brahmi capsule
Table-11- Cross-tabulation
Indications of Brahmi capsule Total
Improving

I&C and memory

Improving

I&C ,memory and sleep

Improving

I&C ,memory and speech

All indications
Anupana Arishta 15 18 14 7 54
Gritha 10 10 12 8 40
Ksheeram 21 25 22 22 90
No Opinion 8 5 7 6 26
Luke warm water 0 5 4 1 10
Total 54 63 59 44 220

Majority of the physicians (90) suggested that the anupana of brahmi capsule is ksheeram. The combination with saraswaristam is also suggested by 54 physicians.

 

6) Preferred dosage

Table-12-Dosage

Preferred dosage Frequency
Twice a day 156
Once in a day 45
Thrice in a day 5

Figure-6

Majority (76%) of the physicians’ ideal dosage of the medicine is twice a day.

Preferred dosage of Brahmi capsule * Indications of Brahmi capsule
Table-13- Cross-tabulation
Indications of Brahmi capsule Total
Improving

I&C and memory

Improving

I&C ,memory and sleep

Improving

I&C ,memory and speech

All indications
Preferred dosage of Brahmi capsule Once in a day 9 18 15 9 51
Twice a day 42 45 43 34 164
Thrice a day 3 0 1 1 5
Total 54 63 59 44 220

 

7) Additional benefits

Table-14- Additional benefits

Additional benefits Observations
Yes 216
No Opinion 4

Figure-7

99% of the respondents opined that Brahmi capsule is having additional benefits like relieving anxiety, stress etc.

Additional Benefits  and Effectiveness of Brahmi capsule
Table-15- Cross-tabulation
Effectiveness of Brahmi capsule Total
Mild Moderate Very Effective
Additional Benefits Yes 12 84 120 216
No Opinion 2 2 0 4
Total 14 86 120 220

 

Table-15-Chi-Square Tests
Value Df Asymp. Sig. (2-sided)
Pearson Chi-Square 6.136a 2 .047
N of Valid Cases 220

The test for association of Effectiveness of Brahmi capsule and its additional benefits is found be statistically significant with a p value 0.047.

Table-16- Additional Benefits and usage of Brahmi capsule in clinical practice
Additional Benefits Total
Yes No Opinion
 In your clinical practice are you using Brahmi capsule Never 0 1 1
Rarely 17 0 17
Occasionally 103 0 103
Always 97 2 99
Total 217 3 220

 

Table-17-Chi-Square Tests
Value df Asymp. Sig. (2-sided)
Pearson Chi-Square 74.310a 3 .000
N of Valid Cases 220

The test for association of additional observations and the physicians with almost always usage of brahmi capsule is found to be statistically significant with a p value0.000.

Additional observations- It increases bowel movement in constipated patients. It is good in gastritis, premature graying of hair, excessive salivation or drooling of Saliva, stammering etc.

Section 4- Discussion

  • Indications of Brahmi capsule

Improving concentration and intelligence.

Out of 220 responses, 184 physicians opined that brahmi capsule improves concentration and intelligence. Acharyas have mentioned that Medhya drugs are useful in the effective management of many conditions related with mind and Brahmi (Bacopa monneiri ) is a widely accepted Medhya drug. It is also included in the gana of Prajnasthapana(restoring intellect and knowledge), Samjya sthapana(Restoring sensation) and Shiro virechana. Therefore, Brahmi, may directly work on micro-faculties of such as Dhi, Dhriti, and Smriti which in turn will help in the management for treating behavioral issues and learning difficulties.

 

Bacopa, by the virtue of containing active constituents like bacosides, influences the synthesis and availability of the neurotransmitter, serotonin. Therefore, Bacopa helps to maintain neurotransmitter balance (Charles et al., 2011Rauf et al., 2012a).Bacoside A shows a potent antioxidant effect in specific areas of brain. Bacopa is known to increase the activity of endogenous antioxidant SOD (Super oxide dimustate) & GPX (glutathione peroxide) in all the brain regions after a period of 21 days. Bacopa monnieri is also known to increase the antioxidant effect in hippocampus, a structure normally rich in memory neurotransmitter Acetyl choline. Bacopa has been found to reverse the drug induced depletion of Acetyl choline in the hippocampus.4

The bacosides promote the repair of damaged neurons by up regulating neuronal synthesis and kinase activity. The bacosides also aid in the restoration of synaptic activity, which ultimately leads to nerve impulse transmission (Singh and Dhawan, 1997). The nerve impulse transmission, plays a vital role in promoting healthy cognitive functions like attention span, focus, concentration, learning and memory.5

 

Effect on memory

Bacopa monnieri has been studied extensively at the central drug research institute Lucknow. According to the works at CDRI, Bacosides are the main phytochemical responsible for its action. Bacosides are attributed with capability to enhance the efficiency of nerve transmission thereby it strengthens memory and cognition.6

According to Kayyadeva nighantu, brahmi is medhya (improves intellect),rasayana(general rejuvenator),hridya(improves general mood), ayushya(increases longevity)7.

Among all the free radicals in living organisms, the most abundant are the super oxide radical and most destructive are the hydroxyl radical. These radicals appear to work together to induce degeneration by oxidizing membrane lipids, breaking DNA strands and damaging cellular proteins. The enzymatic defense system operates as a chain, starting from SOD and followed by the action of GPX and CAT.

Bacopa monnieri is found to increase SOD, CAT & GPX activities significantly throughout all the brain regions. Thus it possesses possible anti-aging benefits owing to its ability to alleviate oxidative stress in the striatal area of brain, which has good benefit in Alzheimer’s & Parkinson’s disease.

Study revealed that standardized Bacopa monnieri extract produced significant improvement on mental control, logical memory and paired associated learning during the 12-week drug therapy.8

Improving speech

67 doctors suggested that brahmi capsule is effective in improving speech (swarya). According to Bhava prakasha ,Kayya deva nighandu7 and Madanapala nighandu it is swarya.

Improving sleep

92 physicians opined that brahmi capsule improves the quality of sleep. Bacopa is considered to mediate the Gamma- Amino Buteric (GAB) aergic system.8 Gamma- Amino Buteric acid is an inhibitory neuro-transmitter that has been shown to possess sedative, anticonvulsive and anti- nociceptive effects.

Charaka has described the cause of sleep as due to the Klanta( fatigue) and Klama (mental fatigue) and  the divorce of the sense objects from the senses.9Brahmi helps to lower stress and anxiety levels which in turn helps the mind to detach itself from the sense organs and thus leads to natural circadian rhythms which induce sound sleep.

 

Ideal time of administration of Brahmi Capsule

For any medicine to show its complete action on the vyādhi(disease), it needs to be administered in a proper kāla(time) with regards to doṣa (Functional elements of body) predominance, agni bala (digestive power), bala of rogi(strength of the patient) etc. That particular time is termed as auṣadha sevana kāla.ie, the ideal time for administration of medicine. Vāgbhaṭa has stated that ‘kālo bheṣaja yogakṛt, which means, kāla (the ideal time) fulfils the aim of administration of auṣadha (medicine).

Most of the physicians responded that the ideal time of administration of Brahmi Capsule is at bed time as the indications of Brahmi capsule is mainly related to brain functions.‘Niśi’
(night time administration of  a drug) is ideal for the treatment of diseases  related to  parts of the body above  shoulders.10

 

Preferred Anupana

Anupana is a substance which is taken along with or after the intake of Aahara (food) and oushadha drug11.Most popular anupana for Brahmi is milk. According to Vaghbhata, milk when digested properly, it is jivaniya (nourishes all the tissues), medhya (improves intelligence), sramahara (reduces fatigue). It is one of the most important foods to promote ojas (Essence of all physiological activities and health) 12. So administration of Brahmi with milk enhances its therapeutic effectiveness.

Additional benefits of Brahmi

Over and above the indications that has been mentioned, Brahmi is a well-known Rasayana dravya (regenerative drug), and Susruta mentions its usage in the Medha Ayushkamiya Adhayaya ,where it is mentioned that Brahmi  helps in treating both Medha (intellect) and Ayus (Improves life expectancy) related problems. It implies that it acts at cellular levels, improving the innate healing potential and thus enhancing the life span by aging gracefully. Rasayana drugs like Brahmi have been shown to be antioxidants. Antioxidants play a definite role in improving the quality of life by preventing the excessive wear and tear phenomenon of cell structure and maintaining normal physiological activities.

Acharyas agree that Pragyaparadha( improper actions done physically, verbally and mentaly which leads to long standing unhealthy issues) is the primary cause of the emergence of most of the diseases. So, if a person’s Medha (intellect) is taken care of by regular usage of Brahmi, his/her positive decisions can help him in maintaining his/her personal and social life healthy on a long term basis. Kashyapa has recommended the use of Medhya Rasayana (substances that enhances a person’s intellect) like Brahmi soon after the birth itself to promote normal brain functioning. All acharyas have recommended the use of medhya rasayanas like Brahmi to promote intellect and also for the treatment of Manasika vyadhi (mental disorder) like Unmada, Apasmara etc 13

 

Conclusion

  • Brahmi is a traditional medicine used since Vedic times for problems related to memory and cognition. This cross sectional study was conducted among the Ayurvede physicians across India to assess the effectiveness and additional benefits of Brahmi Capsule.
  • Out of 220 physicians, 155 (70.45%) physicians were having more than 10 years of experience, 63 physicians were having more than 20 years of experience. 202 physicians are using Brahmi capsule in their practice either always or occasionally.
  • 45%(155) of physicians having more than 10 years of experience suggested that Brahmi capsule is very effective in the management of memory dysfunction. It also helps in improving concentration, intelligence, speech and sleep.
  • Out of the 4 major indications that is mentioned, 176 physicians responded that it is effective in three of its indications like improving concentration & intelligence, memory and speech.
  • Majority of the doctors (103-46.8%) opined that the ideal time of administration of Brahmi capsule is at bed time.
  • 90 physicians suggested that the anupana of brahmi capsule is ksheeram. The combination with Saraswarishtam is also opined by 54 physicians.
  • 216 physicians opined that Brahmi shows additional benefits like relieving anxiety, tremors, depression related to diabetes and helps to improve fine movements of upper and lower limbs in post-surgical cases. It also shows positive results in conditions like stress, disturbed sleep, seizures, slurred speech, stammering and premature graying of hair.
  • It is evident from the literature that our Acharyas were having a clear idea about the usage of Brahmi as Medhya rasayana and it was given to infants soon after birth considering its potency to facilitate proper nutrition to both body and mind.
  • Brahmi is a well-known Rasayana dravya, and Sushruta mentions its use in the Medhaayushkamiya adhayaya for both treating intellect and for improving the life expectancy. It implies that Brahmi acts at cellular levels, improving the innate healing potential and thus enhances the quality of life by aging gracefully.
  • All the Acharyas agree that Pragyaparadha is the primary cause of the emergence of all diseases and to prevent it, proper functioning of Medha(intellect) is a must. Medicines like Brahmi helps an individual in improving the mental functions including intellect and thus helps in carrying out a productive healthy personal and social life.
  • Statistically significant values (P value <0.05) has been obtained in the survey
  1. The test for association of Effectiveness of Brahmi capsule and Clinical Experience in years got significant association with a P value 0.007(<.05).
  2. The test for association of Effectiveness of Brahmi capsule and its additional benefits is found be statistically significant with a p value 0.047.
  3. The test for ‘association of additional observations’ and the ‘physicians with almost always usage of brahmi capsule’ is found to be statistically significant with a p value0.000.

Future work recommendation

A comparative clinical trial for assessing the effectiveness and added benefits of Brahmi capsule.

Acknowledgement

Managing Trustee, Arya Vaidya Sala Kottakkal, Chief Executive officer Arya Vaidya sala, Kottakkal, and the whole physicians who involved in the survey

Conflict of Interest

None

 

Reference

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  • Singh S, Sawani V, Deokate M, Panchal S, Subramanyam AA, Shah HR. Specific learning disability: a 5 year study from India. Int J Contemp Pediatr. 2017;4:863–8.
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  • Bhattacharya SK, Bhattacharya A, Kumar A, Ghosal S. Antioxidant activity ofBacopa monniera in rat frontal cortex, striatum and hippocampus. Phytotherapy Research. 2000 May;14(3):174-9.
  • Singh HK, Dhawan BN. Neuropsychopharmacological effects of the Ayurvedic nootropic Bacopa monniera Linn.(Brahmi). Indian Journal of Pharmacology. 1997 Sep 1;29(5):359.
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  • Yadavji Trikamji, editor. Agnivesa. Caraka Saṃhita Sutra sthāna. [Ᾱyurveda Dipika, Chakrapanidatta (comm) (Sanskrit)]. Varanasi: Chaukhamba Sanskrit Sansthan; 2020.
  • Murthy S. K. R. Ashtanga Hridaya (with English translation): Chaukhamba orientalia publications, Varanasi; Suthrasthana, chapter 13, 2009; 187: 13-41.
  • https://www.yackodoli.com/wp-content/uploads/2019/11/RESP_602_1552893746.pdf accessed on 06/07/2023
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