- Research article
- Open Access
- Open Peer Review
Effects of Korean red ginseng (Panax Ginseng Meyer) on bisphenol A exposure and gynecologic complaints: single blind, randomized clinical trial of efficacy and safety
© Yang et al.; licensee BioMed Central Ltd. 2014
- Received: 20 October 2013
- Accepted: 14 July 2014
- Published: 25 July 2014
Korean red ginseng (KRG) is a processed ginseng from raw ginseng to enhance safety, preservation and efficacy, known having beneficial effects on women’s health due to its estrogen like function. While estrogen supplementation showed some modulation of endocrine disrupting chemicals, bisphenol A (BPA) has been focused as a potential endocrine disrupting chemical. In this study, we examined the efficacy and safety outcomes of KRG against BPA, focusing on female quality of life (QOL). Individual variations in susceptibility to KRG were also investigated with the Sasang Typology, the personalized medicine used for hundred years in Korea.
We performed a single-blind randomized clinical trial. Study subjects were young women (N = 22), consumed 2.7 g of KRG or placebo per day for 2 weeks and filled up questionnaires regarding gynecologic complaints at the 4 time spots. We analyzed urinary total BPA and malondialdehyde (MDA), an oxidative stress biomarker, with GC/MS and HPLC/UVD respectively, and diagnosed their Sasang Typology with the questionnaire for the Sasang constitution Classification (QSCC II).
KRG consumption decreased urinary BPA and MDA levels (ps < 0.05) and alleviated ‘menstrual irregularity’, ‘menstrual pain’, and ‘constipation’ (ps < 0.05). SoEum type (Lesser Yin person) among the Sasang types showed significant alleviation in insomnia, flushing, perspiration and appetite by KRG consumption, rather than other Sasang types. During the intervention, no one experienced any aggravated side effects.
We suggest KRG is efficient for protection for female QOL and BPA- exposure and – related oxidative stress. However, individual variation in susceptibility to KRG should be further considered for identifying ideal therapy.
- Korean red ginseng
- Bisphenol A
- Sasang typology
- Gynecologic complaints
- Quality of life
Comparison of ginsenoside contents (%) between Korean white and red ginseng 3
Estrogen supplementation showed modulation of an endocrine disrupting organochlorine, 3,3′,4,4′,5-pentachlorobiphenyl (PCB126) in rat bone and uterus . Ginseng improved the survival rate and sperm quality in the guinea pigs exposed to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), a notorious endocrine disrupting chemical (EDC) . In addition, KRG extract activated both estrogen receptor (ER)α and ERβ and modulated the mRNA levels of estrogen-responsive genes, such as pS2 and ESR1 in vitro study, e.g. MCF-7 cells, however, estrogenic activity of KRG was not manifested in vivo study such as female Sprague–Dawley rats . In human (women), KRG showed improvements in the Kupperman index and in the menopause rating scale scores . Taken together, we can suspect effects of KRG on female reproduction or gynecological complaints via phytoestrogenic structures or characteristics of triterpenoid saponins in KRG.
However, ginsengs, usually white (raw) ginsengs, are stimulants and may cause nervousness or sleeplessness. There were some reports for their side effects, e.g. high blood pressure, insomnia, restlessness, anxiety, euphoria, diarrhea, vomiting, headache, nosebleed, breast pain or vaginal bleeding . On the other hand, processed ginseng, i.e. KRG, have been broadly used with less toxicity after the process from raw ginseng. To avoid side effects of ginseng, ‘the Sasang (四象, four Typology or Constitution)’, which explains the individual differences in behavioral patterns, physical characteristics and susceptibility to a certain disease and medicinal herb based on their bio-psychological traits, has strongly recommended ginseng for Soeumin (少陰人, SE type) among the four types [16, 17].
On the other hand, EDCs have been received attention among scholars and publics, because of their toxicities threatening fertility, intelligence and survival . Among various EDCs, bisphenol A [2,2-bis(4-hydroxyphenyl)propane, BPA] has been focused as a potential EDC due to broad uses of BPA products, e.g. plastic bottles, containers, tooth sealing, etc. Therefore, people can be easily exposed to BPA in daily life. However, health risks of BPA are not clearly determined, yet. Metabolites of BPA, such as quinone- or semiqunone-compounds, are suspected as toxic materials to induce reactive oxygen species (ROS) . ROS showed pathological roles in the female reproductive tract . BPA was detected in the urine of the majority of women undergoing in vitro fertilization, and was inversely associated with number of oocytes retrieved and peak oestradiol levels . We reported that BPA induces oxidative biomarkers, malondialdehyde (MDA) and 8-hydroxydeoxyguanosine . Therefore, BPA itself or its induced ROS can be risky for female reproductive organs.
In this study, we investigated the chemopreventive effects of KRG against BPA and individual variations in susceptibility to KRG regarding female quality of life (QOL) to improve and to extend the application of KRG. The Sasang Typology was used for individual variation for susceptibility to the KRG.
This trial was designed as a single-blind randomized study, which was approved by Institutional Review Board of the Sookmyung Women’s university (SM-IRB-10-0720-004: Seoul, S. Korea). Inclusion criteria for the present study are healthy young women (21–30 yrs), however, who experienced pre-menstrual syndrome, e.g. menstrual pain, menstrual irregularity, etc. We excluded the people, who had any other health problems or took medicine. All participants filled out the informed consents before participating in this study. Volunteers who experienced menstrual pain or irregularity were recruited on bulletins in the above school. The consumption of KRG or placebo was determined by lot, a simple random sampling. Considering safety and other previous clinical trials [26, 27], we administered 9 capsules of placebo or KRG (2.7 g of KRG powder)/day to the subjects after meals for 2 weeks (N = 22: N = 11 for KRG; N = 11 for placebo). During the trial period, we collected their urine before breakfast on 4 spots, day 0, 4, 8 and 14 days and stored at −20°C until analysis was performed. At the same time, all subjects recorded daily food intake (items and volume/meal) during the trial and filled out questionnaires containing items of QOL, side effects of raw ginseng and potential endpoints of EDCs including the 17 complaints, i.e. menstrual pain, menstrual irregularity, cold hands and feet, anemia, dyspepsia, tiredness, loss of appetite, insomnia, diarrhea, constipation, face flushing, dipsosis, headache, palpitation, perspiration, nose -bleeding, and allergy, before the trial and after the next menstruation. These complaints were measured on 5-rating scales (1 to 5, severity increased with the rate, i.e. 1 = not at all; 5 = severely affected]. We asked the subjects whether they consumed KRG or placebo by daily phone calls and followed them up to 3 weeks after the trial.
In addition, we diagnosed all of the subjects into the four types of the Sasang constitution with the questionnaire for the Sasang constitution classification (QSCC) II made by the Sasang Medical Society of Korean Oriental Medical Society . Reliability of the QSCC II was confirmed by diagnoses of Dr. Hwang M-W, an expert of the Sasang medicine. Based on our previous pharmacokinetic study among female subjects (N = 21) for 2 weeks regarding the intervention of KRG , we designed the present study with over 20 subjects.
The participants were compensated not for the benefit but for time spent and inconvenience associated with participation in research activities. The IRB approved the appropriateness of compensation.
Analysis of urinary BPA
We analyzed urinary BPA with GC/MS, following Kim et al. method  with minor modification. In brief, the internal standard, BPA-d16, was added to 2 ml of each urine sample and 1 ml of 0.2 M sodium acetate buffer (pH 5.2) and 50 μL of 0.1% β-glucuronidase were added to the above urine samples. After adding 1 ml of 5% K2CO3 (pH 7), we incubated the reaction mixture at 55°C for 3 hrs and performed twice of liquid-liquid extraction with 2.5 ml of MTBE to collected supernatant after centrifuge. For derivatization, 50 μl BSTFA/TMCS (99:1 v/v) was added to the sample and the mixture was incubated in 60°C for 30 min. We applied 1 μl of the derivatized sample to GC/MS: Agilent 7890 plus gas chromatograph with a DB-5 ms (SW 54 bonded phase) capillary column (30 m × 0.25 mm I.D., 0.25 μm film thickness), interfaced to an Agilent 5975C mass selective detector (70 eV, electron impact mode). One μl of the each sample was injected in split ratio of 5:1. The flow rate was 9 ml/min. Helium was used as a carrier gas for 1.0 ml/min and the temperature of injector was 280°C. The oven temperature was initially 120°C for 1 min, raised to 320°C at 20°C/min, and held for 2 min. Selected Ion Monitoring (SIM) was performed for quantification of BPA at m/z 357 and internal standard BPA-d16 at m/z 368.
Analysis of urinary MDA
We analyzed urinary MDA as an oxidative stress biomarker by its adducts with 2-thiobarbituric acid (TBA, CAS number: 504-17-6) as a previously described method  with minor modifications. Briefly, 300 μl of 0.5 M of phosphoric acid was mixed with 50 μl of urine or 1,1,3,3,-tetraethoxypropane (CAS number: 122-31-6) standards and 150 μl of TBA reagent. The mixtures were heated at 100°C for 1 h. The tubes were chilled on ice for 5 min. Five hundred μl of methanol was added to the mixtures, and the mixtures were centrifuged at 13,000 × g for 10 min. The supernatant fractions were transferred to glass autosampler vials and 20 μl of each supernatant was analyzed by HPLC. The levels of TBA-MDA adduct were determined at 532 nm on an isocratic HPLC system: The TSK gel column ODS-80TM (5 μm, 4.6 mm × 150 mm, Tosoh, Tokyo, Japan) was eluted with 50 mol/l potassium phosphate buffer (pH 6.8) and methanol (58:42, v/v). The flow rate of mobile phase was 0.6 ml/min.
The HPLC system was composed of dual Younglin SP930D pumps (Younglin, Seoul, Korea), MIDAS COOL autosampler (Spark Holland, Emmen, Netherlands) and SPD-10A UV–VIS detector (Shimadzu, Kyoto, Japan).
To confirm no differences between KRG and placebo groups before the trial, we analyzed characteristics of subjects with t-test or Fisher exact test. Shapiro-Wilk W test was used to study the degree of normal distribution of BPA levels and the 17 pharmacodynamic parameters including menstrual pain, constipation, insomnia, etc. Regression analysis was used to study association between the KRG treatment and urinary BPA or MDA levels. Effects of KRG or BPA on the pharmacodynamics parameters were analyzed with t-test or Wilcoxon test due to the normality of the parameters. ANOVA (Analysis of variance) or Kruskal-Wallis test were also used to study effects of the Sasang Typology on responses to KRG.
All statistical analyses were performed with JMP (Version 4, SAS institute, Cary, NC). Statistical significance was defined as p < 0.05.
Characteristics of subjects
Characteristics of subjects before the trial
General (mean ± std)a
KRG (N = 11)
Placebo (N = 11)
22.91 ± 1.81
22.73 ± 1.68
20.12 ± 1.69
20.83 ± 2.24
Urinary total BPA (ng/L)
3.17 ± 2.28
2.38 ± 1.98
Instant food intakec
Lack of association between BPA exposure and gynecologic complaints
In addition, we analyzed associations between urinary total BPA levels before the trial, i.e. the 0 day-levels, and the 17 complaints, which might influence QOL in females and has been suspected as end points of EDCs. As results, we could not find any association between urinary total BPA levels and any complaint or the sum of complaints (ps > 0.05).
Interaction between BPA and KRG
As food can be the main exposure source of BPA , we let the subjects have their usual diet style and keep the same levels of BPA exposure during the intervention. Therefore, we could not find any significant change in urinary BPA levels in the placebo subjects during the intervention. Thus, the above inverse relationship between the KRG treatment and urinary BPA levels reflects that KRG protects from environmental BPA exposure via inhibition of its absorption. We also analyzed association between ‘KRG-reduced urinary BPA levels’ and ‘alleviation of the 17 complaints’ during the 2 weeks-trial. However, we could not find any significant association between them (ps > 0.05).
Effects of KRG on urinary MDA
The range of urinary MDA levels was 0.37-6.7 uM (median, 2.34 uM). At first, we studied whether BPA induced urinary MDA or not and found positive association between urinary BPA and MDA levels (slope = 0.88, R2 = 0.10, p < 0.01). Therefore, we confirmed BPA induced urinary MDA in the present subjects.
Secondly, we investigated effects of KRG on BPA-induced MDA and found reduced urinary MDA levels not in the control (slope = −0.02, R2 = 0.01, p = 0.62) but in the KRG group (slope = −0.09, R2 = 0.11, p = 0.04). Therefore, we can estimate KRG has desirable effects on BPA-related oxidative stress.
Effects of KRG on the 17 complaints
In addition, there was no one who quit the trial due to side effects of KRG and no one experienced side effects of raw ginseng, e.g. insomnia, diarrhea, headache, nosebleed, breast pain, etc., in the present study. Therefore, KRG has a potential to be safe and chemopreventive for the above complaints.
Effects of the Sasang constitutions on the KRG efficacy
After regrouping the subjects into two groups, i.e. the SE type and the other (SY and TE) type, we observed appetite and insomnia in the 17 complains were significantly reduced by the KRG in the SE type, compared to the other types (ps < 0.05).
When we compared effects of KRG on all complains to those of placebo in the same Sasang type, we found insomnia in the SE type and headache and menstrual pain in the TE type were significantly reduced by the KRG consumption (ps < 0.05).
EDCs are toxic chemicals to target reproductive organs and induce infertility [30–32]. Titus-Ernstoff et al. provided evidence of menstrual irregularity and delayed menstrual regularization in the daughters of women exposed to diethylstilbestrol in utero. Menstrual irregularity and pain among the studied 17 complaints are well known complaints, which influence QOL in females and are associated with various female reproduction diseases [34, 35]. BPA has been suspected to disrupt female reproduction systems: For example, levels of BPA in blood are associated with a variety of conditions in women including endometrial hyperplasia, recurrent miscarriages, sterility, and polycystic ovary syndrome . However, some diet, such as folic acid, soy products, etc., can modify end points of BPA via epigenetic modulation . Therefore, we studied effects of BPA on female reproductive complaints, however, could not find any association between exposure levels of BPA and female symptoms. Thus, current BPA exposure levels in the present study may not affect female complaints. In addition, simultaneous exposure of chemopreventive materials with BPA in real environment is suspected to alleviate BPA toxicity.
Secondly, we focused on effects of KRG on BPA exposure and found KRG lowered urinary BPA levels (Figure 4) and BPA-related urinary MDA levels (Figure 5). We previously reported that the wheat sprout (Triticum aestivum) juice, whose main component is chlorophyll, decreases urinary BPA levels and reduces BPA-related oxidative stress . The basic structure of chlorophyll is a porphyrin ring and the chemopreventive mechanism of porphyrins is suspected as trapping reactive forms of xenobiotics by nucleophilic attack . As like as porphyrins, the ginsenosides of triterpen saponins in KRG can attach to aromatic rings with hydroxyl groups and create an electron rich environment that traps the ROS. Thus, our study suggests KRG inhibits BPA absorption and BPA- related oxidative stress.
Thirdly, people can suspect effects of KRG on menstrual irregularity and pain or other female-related complaints, considering phytoestrogenic structures of the ginsenosides in KRG. A case report even showed menometrorrhagia and tachyarrhythmia as side effects of ginseng . However, our present results indicated KRG did not have any female-related side effects, but actually alleviated ‘menstrual irregularity’, ‘menstrual pain’, and ‘constipation’ (Figure 6). Regarding constipation in particular, a recent Japanese study showed that a ginseng-included oriental medicine, consisting of three crude drugs [processed ginger, ginseng and zanthoxylum fruit (5:3:2)], improved stool frequency and alleviated bloating and abdominal pain in patients with chronic constipation . In addition, KRG improved fatigue, insomnia and depression in postmenopausal women by a decrease in cortisol/dehydroepiandrosterone sulphate ratio . A recent report also showed KRG improved the quality of sleep . Taken together, KRG seems to be beneficial for female-related QOL.
However, individual variation in susceptibility to KRG should be tested. Therefore, we focused on the Sasang constitutions to clarify individual variations in efficacy and QOL outcomes of KRG. In the present study, effects of KRG on anemia, flushing, and perspiration were affected by the Sasang constitutions (Figure 6). That is, the SE types showed high efficacy of KRG compared to others. These results support the recommendation that ginseng is a proper medicine for the SE type [15, 18]. Moreover, there was no one who quit the trial due to side effects of KRG or no one experienced aggravated side effects of raw ginseng, e.g. insomnia, diarrhea, headache, nosebleed, breast pain, etc., in the present study. Therefore, side effects of raw ginseng, which were observed out of Korea , can be related to ginseng misuse regardless consumers’ individual variations. Taken together, KRG, the processed ginseng, can be broadly used for not only the SE type but also other types with less toxicity than raw ginseng.Finally, our study includes some of study limitations. At first, some of our results were based on questionnaires, useful epidemiological tools, for end points of female symptoms. The subjects filled out the degrees of the symptoms on the questionnaires for four times during the trial. Therefore, our results should be supported by future pharmacodynamic data, e.g. blood levels of various biochemical parameters. In addition, we have a general limitation of human study, i.e. control of subjects. Although we did our best to control food-related confounders, we could not completely control all factors of food consumption. Therefore, KRG-interacted food should be clarified and considered for future study. Thirdly, we decided the period of trial as 2 weeks for sub-acute tests, considering short half-life of BPA of 12 hrs. In addition, the limited number of subjects and the outliers in the present study might induce relatively broad variation of KRG effects (Figure 4). Moreover, all humans cannot be categorized into 4 groups of the Sasang constitutions. Therefore, future longer and larger scaled trials than the present period are desired to confirm our findings.
In conclusion, the present trial showed that KRG lowers urinary BPA levels and BPA-induced MDA levels and alleviates gynecological complaints without side effects of raw-ginseng. Therefore, KRG is thought to be relatively safe and chemopreventive from BPA-or female-related diseases.
This study was supported by the 2010 grant from the Korean Society of Ginseng funded by Korea Ginseng Corporation.
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