Combined Lifestyle and Herbal Medicine in Overweight Women with Polycystic Ovary Syndrome (PCOS): A Randomized Controlled Trial (original) (raw)

Abstract

Polycystic ovary syndrome (PCOS) is a common, complex reproductive endocrinopathy characterized by menstrual irregularities, hyperandrogenism and polycystic ovaries. Lifestyle modification is a first‐line intervention; however, there are barriers to success for this form of self‐care, and women often seek adjunct therapies including herbal medicines. This pragmatic, randomized controlled trial, delivered in communities of Australia in overweight women with PCOS, compared the effectiveness and safety of a lifestyle intervention plus herbal medicine against lifestyle alone. All participants were helped to construct a personalized lifestyle plan. The herbal intervention consisted of two tablets. Tablet 1 contained Cinnamomum verum, Glycyrrhiza glabra, Hypericum perforatum and Paeonia lactiflora. Tablet 2 contained Tribulus terrestris. The primary outcome was oligomenorrhoea/amenorrhoea. Secondary outcomes were hormones; anthropometry; quality of life; depression, anxiety and stress; pregnancy; birth outcomes; and safety. One hundred and twenty‐two women gave their consent. At 3 months, women in the combination group recorded a reduction in oligomenorrhoea of 32.9% (95% confidence interval 23.3–42.6, p < 0.01) compared with controls, estimated as a large effect (ηp 2 = 0.11). Other significant improvements were found for body mass index (p < 0.01); insulin (p = 0.02) and luteinizing hormone (p = 0.04); blood pressure (p = 0.01); quality of life (p < 0.01); depression, anxiety and stress (p < 0.01); and pregnancy rates (p = 0.01). This trial provides evidence of improved effectiveness and safety for lifestyle intervention when combined with herbal medicines in women with PCOS. © 2017 The Authors. Phytotherapy Research published by John Wiley & Sons Ltd

Keywords: polycystic ovary syndrome, overweight, herbal therapeutics, lifestyle, menstrual regulation, safety

Introduction

Polycystic ovary syndrome (PCOS) is a complex reproductive and endocrine disorder, characterized by heterogeneous presentation of menstrual irregularity (oligomenorrhoea/amenorrhoea), hyperandrogenism, polycystic ovaries, metabolic and psychological disorders and affects up to 18% of reproductive aged women (March et al., 2010). The PCOS represents a major health burden for women and communities (Teede et al., 2010) with economic costs in America conservatively estimated at $US4.36bn per year (Azziz et al., 2005).

A multidisciplinary approach is emphasized in the evidence‐based guidelines for management of PCOS with lifestyle intervention as first‐line treatment, which may regulate menstruation, reduce hyperandrogenism, treat hyperinsulinaemia and improve quality of life (Azziz et al., 2005; ESHRE, 2012). However the strength of evidence for lifestyle intervention is limited by high attrition in randomized controlled trials (RCTs) (Moran et al., 2013a), and clinical uptake remains impeded by the lack of evidence for optimal dietary and exercise practices (Azziz et al., 2005). In addition, physical and psychosocial barriers are commonly observed in overweight women, particularly those with established obesity (Moran et al., 2013b). Additional forms of management include pharmaceuticals (oral contraceptive pills and metformin) (ESHRE, 2012); however, these have limited capacity to address the range of PCOS symptoms (Diamanti‐Kandarakis et al., 2003) and are often contra‐indicated because of increased risk of co‐morbidities (Diamanti‐Kandarakis et al., 2003; ESHRE, 2012) or have high adverse effect profiles (Legro et al., 2007a, 2007b, Tang et al., 2012). Furthermore, few women are satisfied with pharmaceutical management. In a survey of women with PCOS, 99% (648 of 657) expressed their desire for effective treatment alternatives to birth control pills and fertility drugs, (Sills et al., 2001) and as many as 70% of women with PCOS use medical treatment adjuncts such as complementary medicines (Arentz et al., 2014a, 2014b).

Approximately two out of five women with PCOS report use of herbal medicine (Arentz et al., 2014a, 2014b). Plant‐based medicines contain biologically active chemicals that may alter reproductive endocrinology in women with PCOS (Arentz et al., 2014a, 2014b), and metformin, one of the primary pharmacological agents indicated for treatment of women with PCOS, was originally identified in the herb Galega officinalis (Bailey and Day, 2004). However, despite women's use, the evidence for the effectiveness and adverse effects of herbal medicine is scarce (Zhang et al., 2010a, 2010b, Arentz et al., 2014a, 2014b, Lai et al., 2017). Whilst there is evidence from RCTs for individual herbal extracts in women with PCOS, (Chan et al., 2006, Wang et al., 2007, Grant, 2010, Kamel, 2013, Kort and Lobo, 2014, Shahin and Mohammed, 2014), many studies have high risks of bias, and the use of single plant extracts is inconsistent with typical complex herbal prescribing practices (Vickers and Zollman, 1999, Mills and Bone, 2000, Greenlee et al., 2007, Sarris and Wardle, 2010, Zhang et al., 2010a, 2010b, Lai et al., 2017).

In light of the frequent use of herbal medicine by women with PCOS and the absence of robust evidence, examination of herbal medicine as it is used in the community was considered an appropriate research strategy due to its capacity to provide relevant answers to questions of women and clinicians (Fønnebø et al., 2007). We conducted an RCT to determine the clinical effectiveness of combining a herbal medicine treatment (including five herbal extracts) with a lifestyle intervention, compared with lifestyle alone for a greater reduction in oligomenorrhoea in overweight women with PCOS (Qublan et al., 2007, Thomson et al., 2008). Secondary outcomes were reproductive and metabolic hormones, anthropometric markers, quality of life, psychological outcomes and safety according to increased blood pressure and adverse reactions.

Materials and Methods

Study population

This study included women aged 18–44 years with PCOS with a confirmed medical diagnoses according to the Rotterdam criteria (ESHRE, 2004) and a body mass index (BMI) greater than or equal to 24.5 kg/m2 (within the category of overweight for women with PCOS (ESHRE, 2012)). Women taking oestrogens and/or progestogens to regulate menstrual bleeding or antidepressants including selective serotonin reuptake inhibitors, selective noradrenergic reuptake inhibitors, tetracyclic antidepressants, noradrenergic and selective serotonin reuptake inhibitors, monoamine oxidase inhibitors and melatonergic antidepressants were excluded from the trial because of potential negative pharmacokinetic interactions with these pharmaceuticals and the herbal medicine (Izzo et al., 2016, Linde et al., 2008). Women were recruited in New South Wales, Queensland and Victoria, Australia, using advertising and referrals from health providers, gynaecologists and through the social networking site Facebook. Participants provided written consent prior to baseline data collection. Our study recruitment took place in community settings including participants' homes and workplaces, gymnasiums, cafes and parks.

Study design

This trial was designed pragmatically and intended to inform the contextual decisions of clinicians treating overweight women with PCOS for which lifestyle intervention is recommended as first‐line intervention (AAPCOS, 2011; ESHRE, 2012). Ethical approval of the study was obtained from the Western Sydney University Human Research Ethics Committee (EC00314) on 20 December 2011. An amendment to the trial protocol approved on 9 August 2012 enabled recruitment from electronic social media (Facebook), delivery of the interventions and collection of data at locations convenient to participants. Women meeting the eligibility criteria were randomized in parallel groups to herbal medicine plus a lifestyle intervention or the lifestyle intervention alone. The randomized sequence was computer generated in permuted blocks of 50 by an external, independent organization (Sealed Envelope Limited, London, UK) (http://www.SealedEnvelope.com), communicated via short message service in real time at the conclusion of baseline data collection and concealed from the research team. Three levels of stratification were defined as BMI 24.5 to 29.9, BMI 30 to 33 or BMI over 33. The aim of stratification was to minimize selection bias and prevent of women with similar BMI kg/m2 characteristics being allocated to either the test or control groups. Participants and clinicians were aware of group assignment and therefore not blinded; however, the analysis was undertaken blind to group allocation.

Two subgroups were defined a priori on the Australia and New Zealand Clinical Trial Registry in January 2012 (reference: 201126 12000 122 8532). These were (i) women who participated in blood tests and (ii) women who wanted to conceive. The subgroup of women who participated in blood tests included women with oligomenorrhoea, selected in the order of recruitment and limited by the funding available for this doctoral study. The subgroup of women wanting to conceive included participants who self‐identified during baseline data collection.

Interventions

The interventions were administered for 3 months.

Both groups: lifestyle intervention

The lifestyle intervention was guided by the evidence‐based guidelines for the management of PCOS (Teede et al., 2010; AAPCOS, 2011) defined as dietary and exercise behaviours that induce weight loss or prevent weight gain. The evidence‐based guidelines recommend a calorie‐controlled diet within a healthy food choice setting (AAPCOS, 2011) and exercise for at least 150 min per week including 90 min of aerobic activity (60–90% of maximum heart rate). Two trained lifestyle coaches (a nutritionist and an exercise physiologist) collaboratively introduced diet modification (identification of nutrient dense foods, calorie content and low glycaemic index carbohydrates (Marsh et al., 2010, Moran et al., 2013a, 2013b)) and a structured sequence of aerobic and progressive resistance exercises. Women had access to the lifestyle coaches throughout the trial, were contacted fortnightly, invited to attend supervised exercise sessions and helped to construct their own personalized lifestyle plan. As a pragmatic trial reflecting real‐world conditions, the lifestyle programme and its delivery were allowed to vary between participants with the aim to maximize generalizability of clinically relevant findings (Rothwell, 2005, Zwarenstein et al., 2008). In the event of pregnancy, participants were advised to continue the lifestyle intervention without increasing the intensity of exercise until consultation with their obstetric carer (McDonald et al., 2016).

Intervention – herbal medicine

Herbal medicine was administered in the form of two types of herbal medicine tablets each containing different herbal ingredients and two 30‐min consultations at trial weeks 4 and 8. During the consultations, women were asked about their well‐being and assessed for adverse effects by a qualified naturopath.

The new herbal regimen was trialled following clinical trial notification with the Therapeutic Goods Administration, Australia. The herbal ingredients were selected based on the evidence for reproductive endocrine effects (Arentz et al., 2014a, 2014b) and tailored to wider presentations of PCOS guided by naturopathic principles indicated by commonly observed clinical signs and symptoms of overweight women with PCOS (ESHRE, 2012).

Tablet one was manufactured specifically for the trial and contained the combined extracts of Glycyrrhiza glabra, Paeonia lactiflora, Cinnamomum verum and Hypericum perforatum (Table S1). These individual extracts are commonly combined in western herbal formulations for treatment of women with PCOS (Mills and Bone, 2000). The G. glabra and P. lactiflora were included to potentially reduce androgens (Yaginuma et al., 1982, Takahashi and Kitao, 1994, Armanini et al., 2004, Armanini et al., 2007); C. verum was included to improve insulin sensitivity (Wang et al., 2007) and menstrual regularity (Kort and Lobo, 2014); and H. perforatum was included to reduce depression (Gaster and Holroyd, 2000). Although there was no evidence for H. perforatum specifically in women with PCOS, evidence from systematic reviews has demonstrated effectiveness for mild to moderate depression (Gaster and Holroyd, 2000, Linde et al., 2008), which is prevalent in women with PCOS. Additional actions of the herbal medicines included potential digestive carminative properties (G. glabra and C. verum), improved hepatic metabolism (H. perforatum and G. glabra), antiinflammatory actions (G. glabra) and improved mood and cognitive effects (H. perforatum and P. lactiflora) (Bone and Morgan, 1996, Mills and Bone, 2000, Greenlee et al., 2007, Asl and Hosseinzadeh, 2008, Wardle et al., 2012).Three tablets once a day were administered throughout the trial. Participants were advised to cease taking the herbal medicine tablets if they conceived because of unestablished safety of use of these herbal medicines in pregnancy (Izzo et al., 2016).

Tablet two, MediHerb Tribulus Forte (Integria Healthcare (Australia) Pty Ltd), contained Tribulus terrestris extract equivalent to 13.5 g aerial parts (Table S2). The T. terrestris was provided separately because of its possible potentiating effect of follicle stimulating hormone (FSH) in women (Arentz et al., 2014a, 2014b). Administration of this tablet was limited to the follicular phase of the menstrual cycle. Dosage of three tablets per day for ten consecutive days commenced on menstrual cycle day 5 for oligomenorrhoeic women and within 1 week of trial commencement for women with amenorrhoea.

The two herbal tablets were manufactured by MediHerb (Integria Healthcare (Australia) Pty Ltd). The contents of the newly formulated tablet were verified independent to the manufacturer (Singh et al., 2013). Liquid chromatography coupled with photodiode array detection and electrospray ionization with tandem mass spectrometry was utilized to confirm four herbal extracts and nine biomarkers against standards specified by the European Commission Directorate for Agriculture guidelines (2002). Tribulus Forte is a listed medicine on the Australian Register of Therapeutic Goods (ARTG 185079) and available following consultation from herbal practitioners. The tablets were manufactured in accordance with good manufacturing practice. Commercialization of the novel herbal tablet remains at the discretion of the manufacturer.

Study outcomes

The primary and secondary outcomes were selected on the basis of empirical evidence from women with PCOS about the most important outcomes from shared decision‐making and risks associated with PCOS (Teede et al., 2010). Study outcomes were assessed at 3 months after adjustment for baseline menstrual cycle variation at baseline. The primary end point was oligomenorrhoea defined as irregular menstruation or 35 to 179 days between menstrual periods (ESHRE, 2012) measured as the mean number of days in the menstrual cycle. Pre‐specified secondary study end points included serum concentration of reproductive hormones; glucose and insulin sensitivity; anthropometric characteristics; health‐related quality of life (HRQoL) and depression, anxiety and stress; pregnancy and birth outcomes; and safety of the herbal medicine assessed as increased blood pressure and adverse reactions.

Data collection

The primary outcome was assessed by the number of days in the menstrual cycle and was self‐reported using printed menstrual charts or documented using websites providing digital menstrual cycle tracking services (FertilityFriend, 2014). Hormones [oestradiol, FSH, luteinizing hormone (LH), testosterone, sex hormone binding globulin (SHBG) and free androgen index (FAI)] were assessed by registered pathology companies compliant with statutory standards specified by the Australian Government (NPAAC, 2013). Blood was collected between 2 and 10 days of the menstrual cycle for non‐amenorrheic women or within 1 week of trial commencement for women without menstrual cycles. Insulin sensitivity was assessed by insulin and glucose serum concentrations following 8 h fasting and with the Quantitative Insulin Sensitivity Check Index (Katz et al., 2000). Anthropometry was assessed by body weight (kg), BMI kg/m2, waist and hip circumference (centimetres) and waist‐to‐hip ratio (W:H): HRQoL was assessed by the Polycystic Ovary Syndrome Questionnaire (PCOSQ) (Cronin et al., 1998), depression, anxiety and stress were assessed by the depression, anxiety and stress short form (DASS 21) (Lovibond and Lovibond, 1995) and pregnancy and live birth outcomes were assessed by serum measurements of beta human chorionic gonadotropin (BHCG) β HCG concentration (following β HCG detection in urine), ultrasound reports and post‐natal reports provided by participants. Adverse effects were assessed as blood pressure increments measured at weeks 4 and 8 and participants self‐reporting adverse experiences, reactions or events (Therapeutic Goods Administration, 2000) throughout the trial to the clinicians. Participant compliance was assessed by tablet count with the return of contents of herbal bottles at 3 months. Women's compliance with the exercise and dietary intervention was assessed fortnightly and during an interview at week 12. Women self‐reported the intensity of exercise (mild, moderate or vigorous) and number of minutes per week, dietary compliance was assessed through the average number of self‐reported servings of vegetables and fruit per day and number of high energy, nutrient sparse meals per week. There were no penalties including discontinuation in the trial for non‐compliance.

Sample size and statistical analysis

We estimated that a sample size of 110 women completing the study would have 80% statistical power (significance level α = 0.05) to detect a clinical difference determined a priori in the mean percentage reduction in the number of days in the menstrual cycle of 55% for the group receiving the combined intervention, compared with a reduction of 30% in the control group. This estimation was based on studies reporting similar outcomes in women with PCOS for lifestyle interventions (Hoeger et al., 2004, Qublan et al., 2007, Thomson et al., 2008). Based on attrition rates from other studies, we estimated a 25% loss to attrition and calculated the necessary sample size at 148. As the trial progressed, it became apparent that attrition was approximately 10% and the minimum sample size was recalculated to 122 participants.

Data were coded and entered onto statistical software spss (IBM, 2013) by an independent data entry clerk and statistically analysed blind to group assignment. There were no interim analyses. Analyses were performed on an intention‐to‐treat basis, and data from participants who withdrew or were withdrawn were analysed according to their group of random assignment (Fisher et al., 1990). Missing end point data were imputed with the last observation carried forward method. In alignment with the study protocol and stated a priori, subgroup analyses were conducted for women who participated in blood tests (n = 64) and women wanting to conceive (n = 70). Baseline characteristics were summarized using counts and percentages for categorical variables and means and standard deviations if continuous. The randomized groups were observed for baseline differences of a magnitude of 10% or more.

Analysis of covariance was used to investigate differences between groups at 3 months after controlling for baseline levels. Assumptions confirmed prior to analysis of covariance included homogeneity of variance (Levene's test), linear relationships, homoscedasticity and homogeneity of the regression slopes. Positively skewed data with less than 30 observations were converted to their logarithmic value prior to statistical testing and back converted prior to reporting results. The effect size was estimated using partial Eta squared ηp2 where a value of 0.01 was interpreted as a small effect size, 0.02 to 0.06 as medium and 0.07 to 0.14 as a large effect size (Cohen, 1973). Results were presented as the adjusted mean difference (MD) between groups at end point and associated 95% confidence intervals (CIs). Differences between groups for secondary binary outcomes (pregnancy, miscarriage and live birth rates) were analysed using chi‐squared tests and relative risks (RRs). The effect of loss of body weight and on the primary outcome after controlling for baseline menstrual cycle variation and study group was examined with partial eta squared ηp2.

Results

One hundred and twenty‐two women met the inclusion criteria and were enrolled into the study between August 2012 and January 2014 (Fig. 1). Fourteen women (11.5%) withdrew or were lost from the trial at similar rates for each group. Two women in the treatment arm were withdrawn from the trial because of mild adverse events. These are documented in full in Fig. 1.

Figure 1.

Flow chart of enrolment and analysis (CONSORT diagram).

Randomization produced no imbalances between groups for demographic, reproductive, lifestyle characteristics or pharmaceutical use (Table 1). Participant characteristics were typical of overweight women with PCOS (ESHRE, 2012) with high prevalence of long and irregular menstrual cycles (77.9%), biochemical hyperandrogenism (48%), elevated LH, FSH ratio (35.8%), insulin resistance (51.7%), low quality of life (82%) and moderate‐to‐high depression, anxiety and stress. The mean (±standard deviation) number of days in the menstrual cycle for women assigned to the herbal medicine plus lifestyle was 106.0 (±123.0) days at baseline and for women allocated to the lifestyle intervention only group 109.5 (±148.0) days, (p = 0.889). Serum concentration of hormones was analysed for a subgroup of 64 participants. Seventy women were hoping to conceive during the trial.

Table 1.

Baseline characteristics of participants by study group

At follow‐up, participants reported improved lifestyle practices with 89 of 122 (73%) self‐reporting at least 150 min exercise per week and 105 of 122 (86%) reporting health conscious dietary decisions. There were no significant differences between groups for number exercising 150 min or more per week (43 of 60 in the lifestyle plus herbal group, compared with 46 of 62 in the lifestyle only group, RR 0.99, 95% CI 0.80 to 1.24, p = 0.98) and number reporting health conscious dietary choices (57 of 60 in the lifestyle plus herbal group compared with 54 of 62 in the lifestyle only group, RR 1.09, 95% CI 0.98 to 1.22, p = 0.12).

At 3 months, there was a statistically significant difference in oligomenorrhoea for women in the herbal medicine plus lifestyle group compared with controls adjusted for baseline cycle length (Table 2). The mean menstrual cycle length was 43 days (95% CI 21 to 65, p < 0.001) lower for women in the herbal medicine group than for those in the lifestyle only group. The treatment effect size was estimated as large ηp2=0.11. The proportion of women with normal menstrual cycle length (20–34 days) in the herbal medicine plus lifestyle group was significantly greater compared with controls 33 of 60 (55.0%) compared with 15 of 62 (24.2%) (RR 1.9, 95% CI 1.32 to 2.69, p < 0.01).

Table 2.

Menstrual cycle and clinical characteristics of overweight women with PCOS after administration of lifestyle intervention plus herbal medicine compared with lifestyle alone at three months

Secondary anthropometric outcomes at 3 months found a statistically significant adjusted MD between groups for women taking herbal medicine plus lifestyle compared with controls in body weight (MD −2.95 kg, 95% CI −4.4 to −1.5, p < 0.01) and BMI kg/m2 (MD −1.0, 95% CI −1.6 to −0.5, p < 0.01) with an estimated large effect size (ηp2 = 0.12 and 0.11, respectively). Waist circumference was also significantly lower in herbal medicine group (MD −3.4 cm, 95% CI −4.9 to −1.8, p < 0.01) with an estimated medium effect size ηp2=0.04. There was no statistically significant difference between groups for waist‐to‐hip ratio (MD 0.001, 95% CI −0.01 to 0.01, p = 0.9) (Table 2).

Secondary outcomes relating to reproductive hormonal concentrations for 64 women at 3 months were statistically different for two hormones. Follicular phase oestradiol was increased in the test group (MD 68.9 pmol/L, 95% CI 5.5 to 132.3, p = 0.03), and LH was lowered (MD −1.82 IU/L, 95% CI −3.5 to −0.1, p = 0.04). An estimated medium effect size was found for both oestradiol and LH (ηp2 = 0.08 and 0.06, respectively). No significant differences were found between groups for other reproductive hormones including testosterone, SHBG or FAI (Table 2).

Fasting insulin was significantly lower for women taking herbal medicine in addition to lifestyle compared with controls (MD −5.9 mU/L, 95% CI −10.9 to −1.0, p = 0.02), estimated as a large effect size ηp2=0.1. No evidence was found for other metabolic outcomes differing between groups (Table 2). Women's use of hypoglycaemic medication (metformin) was reduced at end point with no significant difference between groups (p = 0.22). There was a significant improvement for systolic and diastolic blood pressure for women taking the herbal medicine compared with controls (Table 2).

Women assigned to the herbal medicine plus lifestyle group reported significantly improved HRQoL compared with controls for the total PCOSQ score (MD −31.1, 95% CI −41.4 to −20.7, p < 0.01) and for the domains of concerns about body hair (MD −3.0, 95% CI −4.8 to −1.1, p = 0.01), infertility (MD −3.9, 95% CI −5.7 to −2.1, p < 0.01), body weight (MD −5.24, 95% CI −7.8 to −2.7, p < 0.01), menstrual problems (MD −3.9, 95% CI −5.3 to −2.4, p < 0.01) and emotions (MD −8.4, 95% CI −11.4 to −5.4, p < 0.01). The magnitude of effect size was medium to large for concerns about body hair, infertility and body weight and large for the total PCOSQ score, and concerns about the menstrual cycle and emotions (Table 3). Participants taking the herbal medicine tablets plus lifestyle recorded a significantly greater reduction in depression, anxiety and stress scores compared with controls. Mean scores in the test group at end point were −4.3 (95% CI −5.9 to −2.7, p < 0.01), −4.0 (95% CI −5.4 to −2.6, p < 0.01) and −5.0 (95% CI −6.5 to −3.5, p < 0.01), respectively, lower with an estimated large magnitude of effect for all three domains (Table 3).

Table 3.

Estimated effect of treatment on quality of life (PCOSQ) and psychological morbidity (DASS21)

The residual effect of loss of body weight on the primary outcome (number of days in the menstrual cycle) after controlling for baseline menstrual variation was not significant (p = 0.07).

Conception rates were significantly higher for women taking herbal medicine plus lifestyle compared with controls (RR 3.9, 95% CI 1.1 to 13.1, p = 0.01). Medically assisted reproduction was not used by any participants during the trial. Pregnant women miscarried at similar rates in the test (4 of 11, 36%) and control groups (1 of 3, 33%), although no conclusions are drawn from such a small number of events. The live birth rate for women wanting to conceive (n = 70) was not statistically different based on this sample size (p = 0.06).

Two women were withdrawn from the trial with adverse events due to the herbal medicine. Physical symptoms were mild and resolved following cessation of taking the herbal tablets. One participant experienced flu‐like symptoms (headache, lethargy and joint pain) that were relieved following cessation of the herbal tablets. Recommencement of tablets was associated with the return of symptoms. The second adverse event involved abnormal uterine bleeding. At week 5, the participant's menstrual period commenced and continued for 21 days. Although serum concentration of oestradiol, FSH, LH, SHBG, glucose and insulin was within normal ranges, the participant's menstrual period continued for 1 week post cessation of the tablets and subsequently returned to baseline regularity. This participant was withdrawn from the trial at week 6. Overall compliance with the herbal tablets was very high; all but two participants returned empty bottles. One woman returned 17 of the herbal combination tablet, and another returned 12 of the Tribulus Forte tablets. Both of these women had taken less than the prescribed dose.

Discussion

This RCT demonstrated a statistical and clinically significant improvement for a lifestyle intervention following the addition of a novel herbal combination compared with lifestyle intervention alone with reducing PCOS symptomology including a reduction in the number of days of the menstrual cycle (a large treatment effect on oligomenorrhoea/amenorrhoea), improved anthropometry, oestradiol and LH, fasting insulin, blood pressure, conception rates and quality of life. The study also showed important statistically significant reductions to women's depression, anxiety and stress scores. The lifestyle intervention was not improved by the addition of herbal medicine for biochemical hyperandrogenism including testosterone, SHBG or FAI, gonadotropin hormones FSH or the FSH LH ratio, metabolic measurements of fasting glucose or insulin sensitivity or anthropometric hip‐to‐waist ratio.

The findings from this study compare favourably with published data comparing metformin and the oral contraceptive pill Diane Nova (ethinyl oestradiol 35 μg and cyproterone acetate 2 mg) for menstrual regularity over 3 months (Morin‐Papunen et al., 2000). In that RCT, 35 obese women (BMI ≥27) with PCOS taking metformin demonstrated a mean reduction in the number of days in the menstrual cycle from 98 to 74 days (25%, p < 0.05) with significant improvements in waist‐to‐hip ratio and fasting insulin (Morin‐Papunen et al., 2000). Diane Nova was shown to be more efficient at menstrual cycle regulation with a mean reduction from 88 to 28 days (68%, p < 0.05), but no significant impact on anthropometric or metabolic outcomes (Morin‐Papunen et al., 2000). Similar reduced menstrual cyclicity was demonstrated in women taking herbal supplements and lifestyle intervention in our study, with a reduction in mean days between cycles from 106 to 62 days (reduction of 44 days in the test group at 3 months, 39%, p < 0.01). Use of combined lifestyle and the herbal supplement showed greater reductions of diastolic and systolic blood pressure compared with the control group in this study. Because the oral contraceptive pill has been shown to increase blood pressure and cardiovascular disease risk in young women, (Costello et al., 2007, Hickson et al., 2011) avoidance of this medication and concomitant reduction in a cardiovascular risk factor for overweight women with PCOS by using combined lifestyle and herbal medication may confer additional health advantages.

This RCT of lifestyle plus herbal medicine demonstrates significant anthropometric improvements for overweight women with PCOS. According to an Australian report into obesity, most women in this study would be classified as having class 2 obesity, a group at severe risk of obesity‐related health conditions (Australian Government Report 2005). The anthropometric improvements for participants in the test group reclassified for many of these women to class 1, with a moderate risk for developing obesity‐related health complications. In light of the limitations for lifestyle intervention for overweight women with PCOS (Moran et al., 2011), such marked changes over the study duration with both specific gynaecological and mental health improvements are an important finding.

There were no serious adverse events during the trial, and non‐serious adverse effects were substantially fewer compared with the pharmaceutical interventions clomiphene and metformin for managing PCOS (Legro et al., 2007a, 2007b, Tang et al., 2012). From reported data, side effects for clomiphene include abdominal pain in 53% of women, diarrhoea 23%, nausea 39%, hot flushes 28%, headaches 44% and mood swings 15%. For metformin, reported side effects include abdominal pain 59%, diarrhoea 65%, nausea 62%, vomiting 30%, headaches 42% and mood swings 17%. Data from these studies report four serious adverse events including one death. Our study did not directly assess these pharmaceutical agents against the herbal medicine combination; however, the side effect profile appears satisfactory, and future studies comparing the effectiveness of the herbal formulation against pharmaceuticals are warranted given the significant improvement in menstrual and reproductive outcomes.

Menstrual cycle regulation from a lifestyle intervention in overweight women with PCOS is consistently associated with loss of body weight (Thomson et al., 2008, Moran et al., 2013a, 2013b). We found that after correcting for changes in baseline cycle length, changes in bodyweight could only explain 3% of residual variation in menstrual cycle length (p = 0.07); however, being assigned to the herbal medicine plus lifestyle group explained 11% of residual variation (p < 0.01). This suggests that the impact of the combination on oligomenorrhoea was more complex than being explained by loss of body weight alone.

Limitations

The lack of a placebo group prevents identification of the active component of this herbal and lifestyle intervention that has generated these outcomes. There was also limited opportunity to control for non‐specific effects that occurred within the trial that may not be attributable to the herbal medicine or the lifestyle intervention including the placebo effect of the herbal tablets and the unintended motivational role of the two consultations provided to women in the combination group to assess well‐being and monitor adverse effects. This RCT utilized a pragmatic research design to answer the research question about clinical effectiveness (Rothwell, 2005, Fønnebø et al., 2007, Zwarenstein et al., 2008). Research is now needed to examine the discrete effects of components of the interventions and to examine the relationships between herbal medicine and lifestyle intervention.

The lack of blinding could have influenced the estimated treatment effect size particularly for subjective outcomes such as self‐reported QoL, psychology and compliance although objectively measured outcomes were less likely to be at high risk of performance bias (Teixeira et al., 2005, Wood et al., 2008). The positive impact of reduced body weight on reproductive, metabolic and psychological outcomes in overweight women with PCOS was a likely contributor to the positive outcomes, and further research differentiating the effects of the herbal medicine and reduced body weight may further explain the mechanism of the herbal medicine separately to the effects of lifestyle intervention. This would be best achieved using efficacy RCT design (double‐blinded placebo controlled) to explain the factors of the intervention that may have influenced the outcomes and to validate the size of the treatment effects.

The effectiveness of combined lifestyle and herbal medicine for menstrual regulation and secondary outcomes compared with lifestyle alone was demonstrated over three months, further investigations over longer durations are needed to examine the sustainability of the outcomes.

Conclusion

This novel trial provides evidence of effectiveness and safety of the combined herbal medicine and lifestyle intervention in overweight women with PCOS. Future research is needed to explain the specific clinical effects of each component of the intervention.

Authors Contributions

Susan Arentz is a PhD research student at the National Institute of Complementary Medicine, Western Sydney University, Australia. Professor Caroline Smith, A/Professor Jason Abbott and Professor Alan Bensoussan formed her supervisory panel and provided supervisory support and critical assessment of the entire research project. Mr Paul Fahey contributed to the concept, design and the critical revision of the statistical methods and analyses. Dr Birinder (Bobby) Cheema contributed to the concept and design of the lifestyle intervention and intellectually through translation of the evidence‐based guidelines into practice. All authors were integral in the conception and design of the project and contributed critical revision. All authors read the final version of the article and approved.

Details of Ethical Approval

The study was approved by the Western Sydney University Human Research Ethics Committee (EC00314) on 20 December 2011. An amendment to the trial protocol was approved on 9 August 2012. The reference number was H9407.

Data Sharing Statement

Participants gave informed consent for anonymized data sharing. The full data set is available on reasonable request from the corresponding author at s.arentz@westernsydney.edu.au.

Supporting information

Data S1. Supporting Information

Data S2. Supplementary File

Supplementary Table 1. PCOS trial tablet

Supplementary Table 2. MediHerb Tribulus Forte tablet

Acknowledgements

We would like to thank the women who participated in the trial and acknowledge Lisa Vizza of Western Sydney University who contributed to the development and administration of the lifestyle intervention and Swastika Singh and Dr Cheang Khoo for analysing the contents of the tablet and MediHerb (Integria Healthcare (Australia) Pty Ltd) for providing the herbal tablets.

This research project was funded by Western Sydney University as doctorate candidate project funding for S. A. with support from an Australian Postgraduate Award. Higher Degree Research training funds were used to fund analytical services of a retail pathology company. The herbal tablets were provided as an unconditional gift from MediHerb (Integria Healthcare (Australia) Pty Ltd) who also provided S. A. with a stipend between February and August 2014. The trial was conducted entirely independent to the company who had no role in the design, administration, data analyses or interpretation of results.

Conflicts of Interest

There are no commercial affiliations between any of the authors and Integria Healthcare (Australia).

Integria Healthcare (Australia) is located at Eight Mile Plains, Queensland, 4113 Australia.

Authors S. A. and J. A. are also engaged in clinical practice.

Arentz, S. , Smith, C. A. , Abbott, J. , Fahey, P. , Cheema, B. S. , and Bensoussan, A. (2017) Combined Lifestyle and Herbal Medicine in Overweight Women with Polycystic Ovary Syndrome (PCOS): A Randomized Controlled Trial. Phytother. Res., 31: 1330–1340. doi: 10.1002/ptr.5858.

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Associated Data

This section collects any data citations, data availability statements, or supplementary materials included in this article.

Supplementary Materials

Data S1. Supporting Information

Data S2. Supplementary File

Supplementary Table 1. PCOS trial tablet

Supplementary Table 2. MediHerb Tribulus Forte tablet