An Overview on Panax ginseng

Abstract

The origin of ginseng dates back to prehistory. In China, Shennong also known as Emperor Yan, the Yellow Emperor, or one of the " Three Emperors " (the Emperor who is said to have started herbal medicine about 5,500 years ago) is reported to have tasted hundreds of plants to discover many medicinal herbs. For many many years, mankind has been using various plants as nutrient, beverage, cosmetics, dye and medicine to maintain health and to improve quality of life. In Asia, particularly, Panax ginseng C.A. Meyer is considered to be the most precious plant among herbs, and ginseng has been in the spotlight worldwide. Even in the Western world, where there are greatly advanced research facilities and highly qualified manpower available, and are regarded to be capable of conquering any hard-to-cure ailments, many people has recently been reported to use herbal medicine, particularly ginseng. In the present compilation of papers, many scientists contributed papers pertaining to " Chemopreventive effects of ginseng ". In order to facilitate the readers understand easier and better, I catalogued this collection as follows: The spiritual nature of ginseng in the Far East, the history of ginseng, nomenclature and geographical distribution of ginseng, and type of ginseng products. INTRODUCTION Ginseng refers to the root of several species in the plant genus Panax (C. A. Meyer Araliaceae). Among them, Panax ginseng is the most widely used ginseng and is indigenous to the Far East countries (most notably China and Korea). Panax ginseng was first cultivated around 11 BC and has a medical history of more than five thousand years. The genus name of Panax ginseng " Panax " was given by the Russian botanist, C.A. Meyer, and is derived from the Greek words " pan " meaning all and " axos " meaning cure. The species name " ginseng " comes from the Chinese word " rensheng " which means " human " as ginseng root resemble the human body [1]. In China, ginseng roots are harvested when the plant is 3-6 years old and then, the roots are submitted to air drying (white ginseng) or are steamed (red ginseng). Interestingly, after these two ways of treatment the roots differ in their content of saponins [1] and this may be the reason for the variable actions of different ginseng products. Other species of the genus Panax include Panax quinquefolius (found in southern Canada and in the United States), Panax japonicus (grown in Japan), and less frequently Panax notoginseng (grown in China), Panax pseudoginseng (grown

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International Journal of Pharma And Chemical Research I Volume 3 I Issue 3 I Jul – Sep I 2017
______________________________________________________________Review Article
An Overview on Panax ginseng
Jai Narayan Mishra* and Navneet Kumar Verma
Department of Pharmacy, Kailash Institute of Pharmacy and Management, GIDA,
Gorakhpur -273209, Uttar Pradesh, India.
__________________________________________________________________
ABSTRACT
The origin of ginseng dates back to prehistory. In China, Shennong also known as Emperor Yan, the Yellow Emperor,
or one of the“Three Emperors”(the Emperor who is said to have started herbal medicine about 5,500 years ago) is
reported to have tasted hundreds of plants to discover many medicinal herbs. For many many years, mankind has been
using various plants as nutrient, beverage, cosmetics, dye and medicine to maintain health and to improve quality of life.
In Asia, particularly, Panax ginseng C.A. Meyer is considered to be the most precious plant among herbs, and ginseng has
been in the spotlight worldwide. Even in the Western world, where there are greatly advanced research facilities and
highly qualified man-power available, and are regarded to be capable of conquering any hard -to-cure ailments, many
people has recently been reported to use herbal medicine, particularly ginseng. In the present compilation of papers,
many scientists contributed papers pertaining to“Chemopreventive effects of ginseng”. In order to facilitate the readers
understand easier and better, I catalogued this collection as follows: The spiritual nature of ginseng in the Far East, the
history of ginseng, nomenclature and geographical distribution of ginseng, and type of ginseng products.
Keywords: Ginseng; Chemoprevention; Panax ginseng C.A. Meyer.
INTRODUCTION
Ginseng refers to the root of several species in
the plant genus Panax (C. A. Meyer Araliaceae).
Among them, Panax ginseng is the most widely
used ginseng and is indigenous to the Far East
countries (most notably China and Korea).
Panax ginseng was first cultivated around 11 BC
and has a medical history of more than five
thousand years. The genus name of Panax
ginseng “Panax” was given by the Russian
botanist, C.A. Meyer, and is derived from the
Greek words “pan” meaning all and “axos”
meaning cure. The species name “ginseng”
comes from the Chinese word “rensheng” which
means “human” as ginseng root resemble the
human body [1]. In China, ginseng roots are
harvested when the plant is 3-6 years old and
then, the roots are submitted to air drying (white
ginseng) or are steamed (red ginseng).
Interestingly, after these two ways of treatment
the roots differ in their content of saponins [1]
and this may be the reason for the variable
actions of different ginseng products. Other
species of the genus Panax include Panax
quinquefolius (found in southern Canada and in
the United States), Panax japonicus (grown in
Japan), and less frequently Panax notoginseng
(grown in China), Panax pseudoginseng (grown
in Nepal and eastern Himalayas) and Panax
vietnamensis (grown in Vietnam) [2]. Ginseng is
a widespread herbal medicine [3] and it has
served as an important component of many
Chinese prescriptions for thousands of years [4,
5]. Today it still occupies a permanent and
prominent position in the herbal (best-sellers) list
and is considered the most widely taken herbal
product in the world [6]. Moreover, it is estimated
that more than six million Americans are
regularly consuming ginseng products [7]. They
do not only believe that ginseng will engender
physical benefits, but that it will also have
positive effect on their cognitive performance
and well-being. Ginsenosides or ginseng
saponins are the principle active ingredients in
ginseng and more than thirty different
ginsenosides have been identified [8, 9].
Ginsenosides are unique to Panax species,
many of which exist in minute amounts and are
believed to be responsible for most of ginseng’s
actions [10-13]. Addition-ally, ginsenosides
operate by many mechanisms of action and it
was suggested that each ginsenoside may have
its own specific tissue-dependent effects [14].
The basic structure of ginsenosides is similar.
They consist of a gonane steroid nucleus with
17 carbon atoms arranged in four rings. The

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characteristic biological responses for each
ginsenosides are attributed to the differences in
the type, position and number of sugar moieties
attached by glycosidic bond at C-3 and C-6 [15].
Based on their structural differences, they can
be classified into three categories: the
panaxadiol group (e.g. Rb1, Rb2, Rb3, Rc, Rd,
Rg3, Rh2, Rs1), the panaxatriol group (e.g. Re,
Rf, Rg1, Rg2, Rh1), and the oleanolic acid group
(e.g. Ro) [5, 16]. Interestingly, the ginsenoside
content of ginseng can vary depending on the
Panax species, the plant age, the part of the
plant, the preservation method, the season of
harvest and the ex-traction method [17, 18].
Table1: Scientific Classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Apiales
Family:
Araliaceae
Genus:
Panax
Species:
Panax ginseng
Fig. 1: Panax ginseng
Active Constituents
Panax ginseng contains triterpene glycosides, or
saponins, commonly referred to as
ginsenosides. Many active compounds can be
found in all parts of the plant, including amino
acids, alkaloids, phenols, proteins, polypeptides,
and vitamins B1 and B2.3 Up to 40 distinct
ginsenosides have been identified by thin layer
chromatography (TLC) and methanol extraction
experiments. The nomenclature of ginsenosides
is by the designation Rx, where x represents the
retention factor (Rf) value from the sequence of
spots on TLC from bottom to top. The two major
sub-types of ginsenosides, protopanaxadiol and
protopanaxatriol, are classified according to the
arrangement and number of sugar residues –
glucose, rhamnose, xylose, and arabinose – on
the ginsenosides. Rb1, Rb2, Rc, and Rd are
examples of protopanaxadiol ginsenosides. Re,
Rf, Rg1, and Rg2 are examples of
protopanaxatriols. [19-24] These ginsenosides
have varying concentrations in red and white
Panax ginseng extracts due to different
processing method that affect deacetylating
enzymes within the raw plant material.[25]
Fig. 2: Ginsenosides
Pharmacokinetics
Recent research supports the hypothesis that
ginsenosides are activated by intestinal bacteria
through deglycosylation and esterification.
Protopanaxadiol and protopanaxatriol glycosides
are absorbed into the blood or lymph and
transported to target tissues for esterification
with stearic, oleic, or palmitic fatty acids. The
transformation into ginsenoside metabolites, M1
(20S-protopanaxadiol 20-O-B-D-
glucopyranoside) and M4 (20S-protopanaxatriol)
affect excretion and utilization of the
metabolites.[26]
Mechanism of Action
Panax ginseng is often referred to as an
adaptogen, which suggests it has varied actions
and effects on the body that support nonspecific
resistance to biochemical and physical
stressors, improve vitality and longevity, and
enhance mental capacity. [20,27,28] Reviews
suggest Panax ginseng has immunomodulating
activity by affecting the hypothalamic-pituitary-
adrenal (HPA) axis.3,11In vitro experiments
reveal enhanced natural killer (NK) cell activity
and increased immune cell phagocytosis after
ginsenoside exposure.[20] According to a 1999
World Health Organization review, ginseng
saponins “are thought to decrease serum
prolactin, thereby increasing libido” in male
impotence.[29]

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Clinical Indications
Panax ginseng has been widely studied in
double-blind, randomized, placebo-controlled
trials (RCTs). Although ginseng has been used
by Asian cultures for thousands of years for
conditions such as fatigue, mental stress, blood
sugar regulation, improving libido, and
supporting longevity, modern clinical studies
have focused on the use of Panax ginsengin
cancer prevention, blood sugar regulation,
fatigue, and immunomodulation in human health
and disease.
Immune Modulation
A double-blind, placebo-controlled eight-week
study examined the immune effects of 100 mg
Ginsana (G115), 100 mg liquid ginseng extract,
or placebo twice daily in 60 healthy volunteers.
Blood samples collected at baseline, week four,
and week eight examined polymorphonuclear
(PMN) cell chemotaxis, phagocytosis, total
lymphocytes, T-helper and T-suppressor cells,
and NK-cell activity. The groups receiving
ginseng experienced consistent improvement in
immune system activity at week four and
statistically significant Differences at week eight,
evidenced by improvements in PMN cell
chemotaxis, phagocytosis, and total number of
T-helper and T-suppressor cells. The authors
concluded ginseng extract stimulates the
immune system and the standardized extract is
more effective than the liquid ginseng
extract.[30] Some of the same researchers
examined the effects of Panax ginseng extract
on the immune response to vaccination. The
multicenter, 12-week, double-blind RCT
compared immune response in 227 participants,
measured as NK-cell activity, at weeks eight and
12, post influenza vaccine given at week four.
The treatment group received 100 mg G115
twice daily. NK-cell activity for the ginseng group
was double that of the placebo group (p<0.0001)
at weeks eight and 12. Serum antibody titers
were 272 units in the ginseng group compared
to 171 units in the placebo group. A significant
decrease in the frequency of upper respiratory
infections during weeks 4-12 was noted in the
treatment group compared to placebo; 15 cases
versus 42 cases, respectively. This study
supports the role of ginseng in immune system
modulation. [31] An RCT compared the effects
of red Panax ginseng on HIV-1 infected patients
(n=61).[32] The purpose of this study was to
determine the effects of red Panax ginseng after
accounting for HLA type (I or II and class A, B,
and C), on CD4 counts, CD8 counts, and the
trend toward decreased resistance to anti-
Retroviral drugs. HLA type can be associated
with an improved prognosis in HIV patients,
based on an algorithm that also predicts risk of
disease progression.[33] The treatment group
received 5.4 g red Panax ginseng daily. Blood
samples were taken from the control group
(n=199) and HIV-1 infected patients every six
months throughout the study. Data analysis
revealed an inverse correlation between the
HLA score and the decrease of CD4 T cells over
time, a decrease in the decline of CD4 T cells
associated with the intake of red Panax ginseng,
and a significant (p<0.05) decline of CD4 T cells,
independent of the HLA class I effects on
immune system cells. The authors concluded
that red Panax ginseng and HLA type
independently affect the slow depletion of CD4 T
cells in HIV-infected patients.
Diabetes
Eclectic medicine texts reference Panax ginseng
for its beneficial use in blood sugar regulation.
[19,34] In a double-blind RCT, Sotaniemi et al
examined the efficacy of Panax ginsengin newly
diagnosed type 2 diabetics.[24] Parameters
measured included physical performance, mood,
serum lipids, fasting blood glucose, hemoglobin
A1c (HbA1c), amino terminal propeptide
(PIIINP) concentration, and body weight. PIIINP
serum levels are associated with coronary artery
disease and were used as a safety parameter in
this study. The study participants (n=36) were
given 100 mg ginseng extract, 200 mg ginseng
extract, or placebo daily for eight weeks.
Compared to the placebo group, the 200-mg
ginseng group experienced elevated mood,
improved physical performance, and reduced
fasting blood glucose. The authors concluded
ginseng warrants further study as an adjuvant to
diabetes management. A 2005 double-blind,
crossover RCT examined the effects of Panax
ginseng on blood glucose levels and cognitive
performance during sustained mental
activity.[35] Healthy young adults (n=30) took a
10-minute test battery for baseline results, then
were given 200 mg G115, 400 mg G115, or
placebo. One hour later the test battery was
repeated six times in rapid succession. Blood
sugar levels were assessed at baseline and
twice during the testing procedure. The 200-mg
and 400-mg G115 doses reduced blood glucose
levels significantly (p<0.005). Significant
improvement was also noted in the ability to
complete the serial sevens subtraction task after
taking 200 mg G115 (p<0.05). The authors

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concluded Panax ginseng improves mental
performance, possibly by regulating glucose
metabolism. A double-blind, 12-week RCT
examined the effect of red Panax ginseng on
HbA1c levels in 19 subjects with well-controlled
type 2 diabetes.[36] Study participants received
2 g ginseng or placebo three times daily before
meals. Plasma glucose and insulin, insulin
sensitivity, and oral glucose tolerance were
secondary measures of efficacy, while blood
pressure checks and liver and kidney function
tests assessed safety. Although no change was
seen in HbA1c levels with ginseng, the
participants remained well controlled throughout
the study without pharmaceutical intervention –
with average levels of HbA1c of 6.5 percent. A
significant 8- to 11-percent decrease in glucose
on the oral glucose tolerance test and 33-
percent decrease in plasma insulin (p<0.05) was
seen in the ginseng group compared to placebo.
No change was reported in safety parameters
throughout the study, which led the authors to
conclude red Panax ginseng is safe to use in the
treatment of type II diabetes.
Cancer Prevention
Numerous in vitro and animal studies have
examined the interaction of Panax ginseng with
carcinogenesis, apoptosis, angiogenesis, and
metastasis.[24,37-40] A recent paper proposed
an anti-inflammatory role of Panax ginseng in
the sequence of progression to promotion in a
model of carcinogenesis.[41] Panax ginseng
affects multiple points within the inflammatory
cascade, including inhibition of cyclooxygenase-
2 (COX-2), inducible nitric oxide synthase
(iNOS), and nuclear factor kappa B (NF-
κB).[42,43] In a review, Lee et al concluded
Panax ginseng has a radio protective effect
associated with antioxidant and immune-
modulation properties.8An epidemiological study
examined the protective effect of a variety of
Panax ginseng products on 3,974 patients with
different types of cancer compared to case-
matched controls for 67 weeks.[44] Patients
taking ginseng demonstrated a 50-percent lower
risk of cancer recurrence compared to patients
not taking ginseng. Red ginseng offered greater
protection than white ginseng. Cancer incidence
decreased by 36- and 69 percent in subjects
taking ginseng for one year or five years,
respectively. A greater protective effect was
seen in cancers of the lip, esophagus, pharynx,
lung, and liver. A prospective study examined
non-organ specific cancer prevention of Panax
ginseng.[45] This cohort study used case-
controlled matches (n=4,587) of Koreans over
age 40. A questionnaire was used to determine
pattern of ginseng intake, initial age of ginseng
intake, frequency, duration, and form of ginseng
(fresh, dried, etc.) used by study participants.
Ginseng intake correlated with a 60-percent
reduction in cancer incidence, with a direct
dose-response relationship. Drug-Botanical
Interactions According to a review by
Blumenthal et al, there are no known
interactions between Panax ginseng and
pharmaceuticals, as reported by the German
Commission E.[20,46] Caution is advised with
concomitant use with phenelzine, coumadin, oral
hypoglycemics, insulin, and caffeine, based on
preclinical studies and proposed mechanisms of
action.[28,47] A recent review by Seely et al
suggests cautious use of Panax ginseng in
pregnancy and lactation, although no specific
teratogenic or hormone-disrupting activity was
noted.[22]
Side Effects and Toxicity
Panax ginseng is associated with low toxicity;
few adverse events have been reported with
proper us-age. Adverse events have been
associated with high doses and long-term
usage, producing what has been cited in the
literature as ginseng abuse syndrome,[22,28]
although case studies associated with ginseng
abuse syndrome have been discounted by
several authors.[20] Side effects such as
hypertension, nausea, diarrhea, headache,
mastalgia, insomnia, and skin rash have been
noted.[19,22,28]
Dosage
Ginseng root can be chewed, or taken as a
powder, liquid extract, decoction, or infusion.
The level of ginsenosides can vary depending
on steeping time and type of preparation. The
ginsenoside concentration can vary from
approximately 64-77 percent. Crude
preparations of 1-2 g dried root powder can be
taken daily for up to three months, according to
recommendations by the German Commission
E.29 A decoction can be prepared by simmering
3-9 g dried root in 720-960 mL (24-32 oz) water
for 45 minutes. A fluid extract (1:2 concentration)
prepared from crude root can be dosed at 1-6
mL daily.31An infusion can be made by pouring
150-250 mL (5-8 oz) of boiling water over 1-2 g
root, steeping for 10 minutes covered, and then
straining before drinking. Dosage of Panax
ginseng extract standardized to 4-percent
ginsenosides is 200 mg per day, in divided

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doses, yielding 8 mg ginsenosides daily. Other
reports suggest significantly higher doses of 80-
240 mg ginsenosides daily might be warranted
in some cases. [20]
Warnings and Contraindications
The German Commission E and the World
Health Organization report no known
contraindications for Panax ginseng.[20, 29]
Caution is advised during pregnancy and
lactation due to a lack of controlled human
clinical studies.[20,22] Teratogenicity has been
documented in an in vitro rat embryo model, but
the implication for human health is questionable
due to dosages used that exceed possible
human consumption.[49] In Asian countries the
use of Panax ginseng in TCM formulas is
common throughout pregnancy and
lactation.[22]
TYPES OF GINSENG PRODUCTS
The conventional sun-drying of ginseng was
switched to the steaming method to meet the
great demand for ginseng which was stimulated
by active trade with China during the reign of
King Ae, the 14th King of Balhae. Xu-Jing of the
Sung Dynasty, an attendant to a special envoy
of the Chinese Emperor to Korea, wrote in“Kaoli
T’suching”of the impression of his visit to the
(Korean) Kingdom of Koryo in 1123, during the
reign of King In Jong. He described in his book
that there were two kinds of ginseng products in
Koryo, sun-dried and steamed ginseng; red
ginseng [50]. Panax ginseng C.A. Meyer
cultivated in Korea (Korean ginseng) is
harvested after 4 to 6 yr of cultivation, and it is
classified into three types depending on how it is
processed:
(a) fresh ginseng (less than 4 yr old; can be
consumed in its fresh state);
(b) white ginseng (4-6 yr old; dried after peeling);
and
(c) red ginseng (harvested when 6 yr old, and
then steamed and dried).
Each type of ginseng is further subcategorized
as ginseng products; fresh sliced, juice, extract
(tincture or boiled extract), powder, tea, tablet,
capsule, etc. Two years old fresh ginseng is also
used as an ingredient in the Korean chicken-
ginseng soup known as “Samketang”.
CONCLUSION
The pharmacologically active ingredients of
ginseng are ginsenosides (ginseng saponins). In
the current time, there is increasing evidence in
the literature on the pharmacological and
physiological actions of ginseng. Ginseng had
been used primarily as a tonic to invigorate
week bodies and help the restoration of
homeostasis. However current in vivo and in
vitro studies have shown its beneficial effects in
a wide range of pathological conditions such as
cardiovascular diseases, cancer, immune
deficiency and hepatotoxicity. Moreover, recent
research has suggested that some of ginseng’s
active ingredients also exert beneficial actions
on aging, CNS disorders and neurodegenerative
diseases. In general, antioxidant, anti-
inflammatory, antiapoptotic and
immunostimulant activities are mostly underlying
the possible ginseng mediated protective
mechanisms.
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