바나바잎 추출물 연구와 출처

Background The corosolic acid (CA), also known as plant insulin, is a pentacyclic triterpenoid extracted from plants such as Lagerstroemia speciosa. It has been shown to have anti-diabetic, anti-inflammatory and anti-tumor effects. Its structural analogs ursolic acid (UA), oleanolic acid (OA), maslinic acid (MA), asiatic acid (AA) and betulinic acid (BA) display similar individual pharmacological activities to those of CA. However, there is no systematic review documenting pharmacological activities of CA and its structural analogues. This study aims to fill this gap in literature. Purpose This systematic review aims to summarize the medical applications of CA and its analogues. Methods A systematic review summarizes and compares the extraction techniques, pharmacokinetic parameters, and pharmacological effects of CA and its structural analogs. Hypoglycemic effect is one of the key inclusion criteria for searching Web of Science, PubMed, Embase and Cochrane databases up to October 2020 without language restrictions. 'corosolic acid', 'ursolic acid', 'oleanolic acid', 'maslinic acid', 'asiatic acid', 'betulinic acid', 'extraction', 'pharmacokinetic', 'pharmacological' were used to extract relevant literature. The PRISMA guidelines were followed. Results At the end of the searching process, 140 articles were selected for the systematic review. Information of CA and five of its structural analogs including UA, OA, MA, AA and BA were included in this review. CA and its structural analogs are pentacyclic triterpenes extracted from plants and they have low solubilities in water due to their rigid scaffold and hydrophobic properties. The introduction of water-soluble groups such as sugar or amino groups could increase the solubility of CA and its structural analogs. Their biological activities and underlying mechanism of action are reviewed and compared. Conclusion CA and its structural analogs UA, OA, MA, AA and BA are demonstrated to show activities in lowering blood sugar, anti-inflammation and anti-tumor. Their oral absorption and bioavailability can be improved through structural modification and formulation design. CA and its structural analogs are promising natural product-based lead compounds for further development and mechanistic studies.

Background Dysbiosis is related to changes in the composition and behaviour of intestinal microbiota, which may contribute to an age-related decline in metabolic and immune system functioning (immune-senescence). Objective The microbiota-targeted dietary and probiotic interventions have been shown to favorably affect the host health by an enhancement of antioxidant activity, improving immune homeostasis, suppression of chronic inflammation, regulation of metabolism and prevention of insulin resistance. Results In our study, the use of specific probiotics strains improved the serum concentration of glycemic markers, thereby promoting better overall health. Conclusion Probiotics may help correct defects in the gut microbial environment improving metabolic parameters, such as blood sugar levels, glycosylated hemoglobin and a decrease in body weight.

Introduction A number of natural compounds have individually demonstrated to improve glucose and lipid levels in humans. Aim To evaluate the short-term glucose and lipid-lowering activity in subjects with impaired fasting glucose. Methods To assess the effects of a combination of nutraceuticals based on Lagerstroemia speciosa, Berberis aristata, Curcuma longa, Alpha-lipoic acid, Chrome picolinate and Folic acid, we performed a double-blind, parallel group, placebo-controlled, randomized clinical trial in 40 adults affected by impaired fasting glucose (FPG = 100-125 mg/dL) in primary prevention of cardiovascular disease. After a period of 2 weeks of dietary habits correction only, patients continued the diet and began a period of 8 weeks of treatment with nutraceutical or placebo. Data related to lipid pattern, insulin resistance, liver function and hsCRP were obtained at the baseline and at the end of the study. Results No side effects were detected in both groups of subjects. After the nutraceutical treatment, and compared to the placebo-treated group, the enrolled patients experienced a significant improvement in TG (-34.7%), HDL-C (+13.7), FPI (-13.4%), and HOMA-Index (-25%) versus the baseline values. No significant changes were observed in the other investigated parameters in both groups (Body Mass Index, LDL-C, hsCRP). Conclusions The tested combination of nutraceuticals showed clinical efficacy in the improvement of TG, HDL-C, FPI and HOMA-Index, with an optimal tolerability profile. Further confirmation is needed to verify these observations on the middle and long term with a larger number of subjects.

Background The aim of this paper is to evaluate the efficacy and safety of DLBS3233, a novel bioactive fraction derived from Cinnamomum burmanii and Lagerstroemia speciosa, in improving insulin resistance and preserving β-cell performance in patients with impaired glucose tolerance (IGT). Patients and methods Eighty adult subjects with IGT, defined as 2-hour postprandial glucose level of 140-199 mg/dL, were enrolled in this two-arm, 12-week, double-blind, randomized, placebo-controlled preliminary study. Eligible subjects were randomly allocated to receive either DLBS3233 at a dose of 50-100 mg daily or placebo for 12 weeks. The study mainly assessed the improvement of homeostatic model-assessed insulin resistance (HOMA-IR), the 15-minute and 2-hour plasma insulin levels, and the oral disposition index. Results After 12 weeks, DLBS3233 improved insulin resistance better than placebo as reflected by a reduced HOMA-IR (-27.04%±29.41% vs -4.90%±41.27%, P=0.013). The improvement of the first- and second-phase insulin secretion was consistently greater in DLBS3233 group than placebo group (-144.78±194.06 vs -71.21±157.19, P=0.022, and -455.03±487.56 vs -269.49±467.77, P=0.033, respectively). Further, DLBS3233 also significantly better improved oral disposition index than placebo. No serious hypoglycemia, edema, or cardiovascular-related adverse events were found in either groups. Conclusion This study has shown that DLBS3233 at the dose of 50-100 mg once daily was well tolerated, and promisingly efficacious in improving insulin sensitivity as well as preserving β-cell performance in subjects with IGT.

Background There is an increasing interest for combined nutraceuticals that can act on several points of lipid and glucose metabolism with preventive purposes. However, the simple assemblage of nutraceuticals with potentially additive mechanism of action need to be clinically tested. Methods To assess the effects of a combination of nutraceuticals based on artichoke, red yeast rice, banaba, and coenzyme Q10, we performed a double bind, cross-over designed trial versus placebo in 30 adults with LDL cholesterol suboptimal in primary prevention of cardiovascular disease. After a period of 3 weeks of dietary habits correction, patients began a period of 6 weeks of treatment with nutraceutical or placebo, followed by 2 weeks of washout and finally 6 weeks in cross-over. Data related to lipid pattern, insulin resistance, renal function, liver and CPK have been obtained at each visit. Results In particular, the after the nutraceutical treatment the enrolled patients experienced a significant improvement in total cholesterol (-13.6 %), LDL-C (-18.2 %), non-HDL-C (-15 %), glutamic oxaloacetic transaminase (-10 %), glutamate-pyruvate transaminase (-30.9 %), and hs-CRP (-18.2 %) versus placebo. No changes have been observed in the other investigated parameters in both groups. Conclusions The tested combination of nutraceuticals has shown clinical efficacy in the reduction of total cholesterol, non-HDL, LDL and triglycerides, while improving the level of liver transaminases and high sensitivity C-reactive protein. Further confirmation are needed to verify these observations on the middle and long term with a larger number of subjects.

IQP-GC-101 is a patented blend of the standardized extracts of Garcinia cambogia, Camellia sinensis, unroasted Coffea arabica, and Lagerstroemia speciosa. These individual ingredients of IQP-GC-101 have each shown promise in promoting weight loss; however, the efficacy of the blend has not been established. This randomized, placebo-controlled, double-blind, parallel group study conducted over 14 weeks (including a 2-week run-in phase) aimed to investigate the efficacy and safety of IQP-GC-101 in reducing body weight and body fat mass in overweight Caucasian adults. Subjects took three IQP-GC-101 or placebo tablets, twice a day, 30 min before main meals. All subjects also adhered to a 500 kcal/day energy deficit diet with 30% of energy from fat. Ninety-one overweight and mildly obese subjects (46 in the IQP-GC-101 group, 45 in the placebo group) completed the study. After 12-week intervention, IQP-GC-101 resulted in a mean (±SD) weight loss of 2.26 ± 2.37 kg compared with 0.56 ± 2.34 kg for placebo (pU = 0.002). There was also significantly more reduction in body fat mass, waist circumference, and hip circumference in the IQP-GC-101 group. No serious adverse events were reported. The use of IQP-GC-101 has been shown to result in body weight and body fat reduction in the current study, with good tolerability.

The present study investigated the effects of soybean leaf extracts (SLEs) on blood glucose, insulin resistance, body fat and dyslipidemia in prediabetes subjects, and compared them with the effects of banaba extracts (BE) which is known to ameliorate diabetes in several animals and clinical studies. Overweight subjects with mild hyperglycemia (fasting blood glucose level of 100-125 mg dL(-1)) were randomly assigned to three groups and administered four capsules containing starch (2 g per day, Placebo), BE (300 mg per day, 0.3% corosolic acid) or SLE (2 g per day) during regular meals for 12 weeks. The SLE as well as BE significantly decreased the baseline-adjusted final blood glucose, HbA1c, HOMA-IR and transaminase levels compared to the placebo group. The body weight, BMI and WHR were not different between the groups, but the baseline-adjusted final body fat content and waist circumference were lower in the BE and SLE groups than in the placebo group. Furthermore, the baseline-adjusted final plasma triglyceride concentration was lower in the BE and SLE groups compared to the placebo group. There were no significant differences in plasma total cholesterol and LDL-cholesterol concentrations between the groups. However, the SLE, but not the BE, significantly increased the plasma HDL-cholesterol concentration and the ratio of HDL-cholesterol to total cholesterol after 12 weeks of supplementation compared to the placebo group, while the atherogenic index was decreased. Taken together, these data suggest that SLE may play an important role in improving blood glucose, insulin resistance, adiposity, and dyslipidemia in prediabetes subjects consuming their habitual diet, similar to or better than BE.

The antidiabetic activity of an extract from the leaves of Lagerstroemia speciosa standardized to 1% corosolic acid (Glucosol) has been demonstrated in a randomized clinical trial involving Type II diabetics (non-insulin-dependent diabetes mellitus, NIDDM). Subjects received a daily oral dose of Glucosol and blood glucose levels were measured. Glucosol at daily dosages of 32 and 48mg for 2 weeks showed a significant reduction in the blood glucose levels. Glucosol in a soft gel capsule formulation showed a 30% decrease in blood glucose levels compared to a 20% drop seen with dry-powder filled hard gelatin capsule formulation (P<0.001), suggesting that the soft gel formulation has a better bioavailability than a dry-powder formulation.

Background Prediabetes describes a state of hyperglycemia outside of normal limits that does not meet the criteria for diabetes diagnosis, is generally symptomless, and affects an estimated 38% of adults in the United States. Prediabetes typically precedes the diagnosis of type 2 diabetes, which accounts for increased morbidity and mortality. Although the use of dietary and herbal supplements is popular worldwide, and a variety of single herbal medicines have been examined for glycemic management, the potential of increasingly common polyherbal formulations to return glycemic parameters to normal ranges among adults with prediabetes remains largely unexplored. The purpose of this study is to evaluate the efficacy of a commercially available, polyherbal dietary supplement on glycemic and lipid parameters in prediabetic individuals. Methods In this multi-site, double-blinded, randomized controlled clinical trial, 40 participants with prediabetes will be randomized to either a daily oral polyherbal dietary supplement (GlucoSupreme™ Herbal; Designs for Health®, Suffield, CT, USA; containing cinnamon bark (Cinnamomum cassia), banaba leaf (Lagerstroemia speciosa standardized to 1% corosolic acid), kudzu root (Pueraria lobata standardized to 40% isoflavones), fenugreek seed (Trigonella foenum-graceum standardized to 60% saponins), gymnema leaf (Gymnema sylvestre standardized to 25% gymnemic acid), American ginseng root (Panax quinquefolius standardized to 5% ginsenosides), and berberine HCl derived from bark (Berberis aristata)) or placebo for 12 weeks. Short-, medium-, and comparatively long-term markers of glycemic control (blood glucose and fasting insulin, fructosamine, and glycated hemoglobin/A1c, respectively), and other glycemic parameters (GlycoMark, β-cell function, and insulin sensitivity/resistance) will be obtained. Lipid profile (total cholesterol, LDL, HDL, and triglycerides), inflammation (hs-CRP), progression to type 2 diabetes mellitus, as well as safety indices (ALT, AST) will be obtained. An intention-to-treat analysis will be used to assess changes in study outcomes. Discussion Treatment options for adults with prediabetes are currently limited. This study aims to evaluate the safety and efficacy of a commercially available dietary supplement in the popular, but as yet insufficiently studied, category of polyherbal formulas for the management of glycemic parameters and other biomarkers associated with prediabetes. Trial registration ClinicalTrials.gov, ID: NCT03388762 . Retrospectively registered on 4 January 2018.

Corosolic acid (CRA) is a substance extracted from Lagerstroemia speciosa L. and has been reported to have biological activities in in vitro and experimental animal studies. In this study, 31 subjects were orally administered 10mg CRA or a placebo, on different occasions, in a capsule 5min before the 75-g oral glucose tolerance test (OGTT) in a double-blind and cross-over design. Nineteen subjects had diabetes, seven had impaired glucose tolerance, one had impaired fasting glucose, and four had normal glucose tolerance according to the 1998 WHO criteria. There were no significant differences in plasma glucose levels before and 30min after the administration. CRA treatment subjects showed lower glucose levels from 60min until 120min and reached statistical significance at 90min. In this study, we have shown for the first time that CRA has a lowering effect on postchallenge plasma glucose levels in vivo in humans.

Objective To assess the effects of a 12-week combined treatment with myo-inositol (2 g) and Banaba extract (48 mg) standardized to 1% corosolic acid (MBN) on insulin resistance (HOMA-IR) and hepatic insulin extraction index (HIEI) in overweight and obese postmenopausal women. Methods We conducted a retrospective observational study including 31 postmenopausal women (mean age 51 ± 1.2 years) attending the Gynecological Endocrinology Center of Modena, Italy. All patients received daily supplementation with MBN for 12 weeks. Hormonal and metabolic parameters-including fasting glucose, insulin, C-peptide, and HOMA-IR-were assessed before and after treatment. In addition, an oral glucose tolerance test (OGTT) was performed at both time points, with glucose, insulin, and C-peptide curves measured and corresponding area under the curve (AUC) values at 240 minutes calculated. HIEI was calculated as the insulin/C-peptide ratio. Data were analyzed globally and then stratified by family history of diabetes. Results After treatment, fasting insulin, HOMA-IR, and HIEI were significantly reduced. The OGTT showed a 23.5% decrease in glucose AUC, with greater reductions in insulin AUC (-42%) compared to C-peptide AUC (-16.8%), suggesting enhanced hepatic insulin clearance. Patients with a family history of diabetes showed reductions in insulin and C-peptide, while those without showed only a decrease in insulin and HIE, with no changes in C-peptide. Conclusions Combined MBN supplementation improved insulin sensitivity and hepatic insulin clearance in overweight and obese postmenopausal women, with particularly pronounced effects in those with a family history of diabetes. These findings underscore the potential of targeted integrative strategies to mitigate insulin resistance in this population.

Aim To evaluate if a nutraceutical containing Berberine, Curcumin, Inositol, Banaba, and Chromium Picolinate (Reglicem ® ), can ameliorate glycemic status in patients with dysglycemia. Methods We enrolled 148 patients with impaired fasting plasma glucose or impaired glucose tolerance, not taking any hypoglycemic compounds. Patients were randomized to take nutraceutical or placebo for 3 months, in a randomized, double-blind, placebo-controlled design. Both nutraceutical and placebo were self-administered once a day, 1 tablet during the breakfast. Results A reduction of fasting and post-prandial plasma glucose was observed with the nutraceutical combination (p Conclusion A nutraceutical containing Berberine, Curcumin, Inositol, Banaba, and Chromium Picolinate can be helpful in improving glyco-metabolic compensation, TC and Tg value, and in reducing inflammatory status in patients with dysglycemia.

This 60-day, 30-subject pilot study examined a novel combination of ingredients in a unique sustained release (Carbopol matrix) tablet consumed twice daily. The product was composed of extracts of banaba leaf, green coffee bean, and Moringa oleifera leaf and vitamin D3. Safety was assessed using a 45-measurement blood chemistry panel, an 86-item self-reported Quality of Life Inventory, bone mineral density, and cardiovascular changes. Efficacy was assessed by calculating a body composition improvement index (BCI) based on changes in dual energy X-ray absorptiometry measured fat mass (FM) and fat-free mass (FFM) as well as between the study group (SG) and a historical placebo group. No changes occurred in any blood chemistry measurements. Positive changes were found in the Quality of Life (QOL) inventory composite scores. No adverse effects were observed. Decreases occurred in FM (p = 0.004) and increases in FFM (p = 0.009). Relative to the historical placebo group, the SG lost more FM (p < 0.0001), gained more FFM (p = <0.0001), and had a negative BCI of -2.7 lb. compared with a positive BCI in the SG of 3.4 lb., a 6.1 discordance (p = 0.0009). The data support the safety and efficacy of this unique product and demonstrate importance of using changes in body composition versus scale weight and BMI.

We sought the long-term efficacy of traditionally used antidiabetic herbs in controlling blood glucose homeostasis and low-grade inflammation. Ninety-four subjects with either impaired glucose tolerance or mild T2D were randomized either to treatment arm or placebo arm and received 1 : 1 : 1 mixture of ginseng roots, mulberry leaf water extract, and banaba leaf water extract (6 g/d) for 24 weeks. Oral 75 g glucose tolerance test was performed to measure glucose and insulin responses. Blood biomarkers of low-grade inflammation were also determined. Results found no significant difference in glucose homeostasis control measure changes. However, plasma intracellular adhesion molecule-1 (ICAM-1) concentration was decreased showing a significant between-treatment changes (P = 0.037). The concentrations of vascular cell adhesion molecule-1 (VCAM-1) (P = 0.014) and ICAM-1 (P = 0.048) were decreased in the treatment group at week 24, and the oxidized low-density lipoprotein (ox-LDL) concentration was reduced at week 24 compared to the baseline value in the treatment group (P = 0.003). These results indicate a long-term supplementation of ginseng, mulberry leaf, and banaba leaf suppresses inflammatory responses in T2D.

Objective To determine the prevalence of complementary and alternative medicine (CAM) use among women with gestational trophoblastic disease (GTD) at the University of the Philippines-Philippine General Hospital (UP-PGH). Study design A survey on the use of CAM among women (N = 52) with GTD managed at the UP-PGH Gestational Trophoblastic Disease Center from June to August 2009 was done. Results The mean age of the participants was 32.3 years, and there were no significant differences in the proportion of CAM users as to educational attainment, diagnosis and treatment type received. Among the participants 96% used CAM, most commonly mental healing/prayer, fruit juices/vegetable diet, banaba/taheebo tea and multivitamins. Reasons for CAM use included safety, improvement of immune system, stress reduction and hope for their condition. Benefits included enhanced quality of life, stress reduction, immune system improvement and a healthier lifestyle. No untoward effect of CAM use was reported. Thirty-six percent of the participants disclosed CAM use to their physician. About 56% percent of the physicians were in favor of the CAM used. The main sources of information on CAM were relatives and friends. Conclusion To better address patients' needs, physicians should routinely ask patients about their use of CAM and be able to discuss these therapies with them.

The primary objective is to evaluate the efficacy of Euglycem® plus recommended standard diet on reducing FPG compared to baseline and to recommended standard diet alone after 3 months Dysglycemia (or prediabetes) is a reversible metabolic condition that increases the risk of developing type 2 diabetes mellitus, a pathological condition that, in prognostic terms, is considered equivalent to cardiovascular disease. Type 2 diabetes mellitus, therefore, is a serious pathology not only for the symptoms and complications related to it but also for the prognosis. Dysglycemia is characterized by an alteration in blood glucose levels that do not yet fall within the diagnostic criteria for diabetes. It is a very common condition that often remains unknown because it is asymptomatic. Dysglycemia is due to a receptor dysregulation between cellular and circulating glucose values and pancreatic insulin production, characterized by an initial resistance to insulin produced by pancreatic beta cells and directed to the muscle cells. Insulin acts as a catalyst for the use of glucose for metabolic purposes with consequent withdrawal of circulating glucose and, therefore, reduction of glycemia. If this regulation does not work perfectly, blood glucose levels increase and the condition of dysglycemia is feared. The main risk factors associated with dysglycemia are overweight and obesity, family history of diabetes, sedentary lifestyle, hypertension and hypercholesterolemia, all risk factors also for cardiovascular diseases. In women dysglycemia is often also correlated with polycystic ovary and gestational diabetes. There is evidence that dysglycemia and type 2 diabetes are associated with a deficiency of vitamin D. The pancreatic beta cells, responsible for the release of insulin, express receptors for vitamin D and their dysfunction is demonstrated in various experimental models. However, the administration of vitamin D to subjects with dysglycemia or diabetes has produced uncertain results. Dysglycemia is a silent condition, therefore asymptomatic, although subjects with dysglycemia are, in general, already exposed to an increased risk of developing cardiovascular diseases. Consequentially, the diagnosis is exclusively laboratory, i.e. a fasting blood glucose (FPG) between 100 and 125 mg/dl, a glucose load curve (OGTT) whose result after two hours is higher than 140 mg/dl (normal limit) and less than 200 mg/dl (diagnostic criterion for type 2 diabetes mellitus), i.e. between 140-199 mg/dl and glycated hemoglobin (HbA1c) values between 5.7-6.4%. It is believed that approximately 11% of subjects with dysglycemia develop type 2 diabetes after three years. This percentage rises to 25% after five years. The remedies to overcome the prediabetic condition are essentially based on the reduction of risk factors and relative improvement of lifestyle. A healthy diet, low in fat and rich in fiber and vegetable protein is important together with physical activity to be practiced according to World Health Organization (WHO) recommendations. To date, no drug is approved for the treatment of dysglycemia, while substances of natural origin have been shown to contribute to the normalization of glucose metabolism in association with the above mentioned remedies which are known to present long-term compliance problems. This is the context in which the association of banaba leaves extract and chromium picolinate (Euglycem®) is positioned. Chromium is an essential mineral that improves insulin sensitivity. It also has favorable effects on the metabolism of proteins, carbohydrates and fats and leads to a reduction in body weight. Chromium deficiency is rare, but significant, because it results in poorer glycemia and cholesterolemia control. Banaba leaves extract promotes the absorption of glucose and its use for energy purposes, thus playing a role in the regulation of blood glucose and insulin levels. By regulating glycemia fluctuations that activate the hunger center, banaba is useful for reducing body weight and triglyceride levels. One study reported that in 10 healthy subjects who received 1 tablet/day of Euglycem containing 50 mg of banaba leaves extract or placebo for 4 days, the supplement significantly reduced the glucose area under the curve (AUC) and insulinemia after glucose load compared to placebo. The same study also evaluated the effect of the supplement in 40 subjects with dysglycemia randomized to receive 1 tablet/day of Euglycem containing 10 mg or 50 mg of banaba leaves extract for 4 weeks associated with an improvement in dietary and behavioral habits. It was highlighted that both dosages improved weight, body mass index (BMI), FPG and Homeostasis Model Assessment (HOMA) index compared to baseline while only the highest dose significantly reduced fasting plasma insulin (FPI) and HbA1c compared to baseline. However, the study has important limitations such as the small number of subjects enrolled and the short duration of treatment. Dietary supplement intervention: Nutraceutical supplements: An association of banaba leaves extract and chromium picolinate (Euglycem®) will be administered Dietary supplement intervention: Placebo: Placebo

Dysglycemia is an important pre-risk condition which can potentially lead to diabetes if not adequately treated. The variation of glycemic balance can lead to cardiovascular disorders. The study will evaluate if Reglicem®, a nutraceutical containing Berberine, Curcumin, Inositol, Banaba, and Chromium Picolinate, can ameliorate glycemic status in patients with dysglycemia. Dysglycemia is an important pre-risk condition which can potentially lead to diabetes if not adequately treated. The variation of glycemic balance can lead to cardiovascular disorders. The study will evaluate if Reglicem®, a nutraceutical containing Berberine, Curcumin, Inositol, Banaba, and Chromium Picolinate, can ameliorate glycemic status in patients with dysglycemia. The investigators will enroll patients with impaired fasting glucose (IFG) or impaired glucose tolerance (IGT), not taking other hypoglycemic compounds. Patients will be randomized to take Reglicem® or placebo for 3 months, in a randomized, double-blind, placebo-controlled design. Reglicem® and placebo will be self-administered once a day, 1 tablet during the breakfast. Dietary supplement intervention: Reglicem: Reglicem is a nutraceutical containing Berberine, Curcumin, Inositol, Banaba, and Chromium Picolinate OTHER: Placebo: Placebo

The primary purpose of this study is to evaluate the impact of a polyherbal dietary supplement (Designs for Health - GlucoSupreme™ Herbal) on markers of glycemic control and other structure/function outcomes among a sample of prediabetic adults. A 12-week randomized, double-blinded, placebo-controlled clinical trial will be conducted to achieve the purpose of this study. The research team hypothesizes that GlucoSupreme™ Herbal will improve a variety of validated markers of glycemic control that are commonly used in clinical practice more effectively than placebo. Prediabetes is a common state in which blood glucose levels are elevated, but are not elevated high enough to be considered Type 2 Diabetes (T2D). The worldwide prevalence of prediabetes is high and rapidly increasing. People with prediabetes are at increased risk for developing a variety of chronic diseases. Most notably, prediabetes nearly always precedes diagnosis of T2D, a poorly-controlled disease adversely affecting 14% of adults in the United States. T2D is responsible for increased risk of heart disease, stroke, blindness and other vision problems, kidney disease, amputations and death. Prediabetes often progresses to T2D relatively quickly, as pancreatic beta-cell dysfunction perpetuates. There are currently limited pharmacological options available for safely reducing the burden of prediabetes. Furthermore, these pharmacological options often carry potentially deleterious side effects. Low-risk alternatives are needed where lifestyle modifications, such as increased physical activity and weight loss, have failed. Herbal dietary supplements have shown promise in safely managing impaired glycemic control in prediabetic adults in many clinical studies. A wide variety of herbs have been previously studied for these purposes, including cinnamon, fenugreek, banaba, curcumin, and a variety of combination products. Of these, most have demonstrated improved management of glycemic control, particularly with regard to reducing fasting blood glucose and postprandial glucose, HbA1c, fasting insulin levels, HOMA-Insulin Resistance, and increasing HOMA-β cell function among prediabetic adult populations. Many herbs have also demonstrated benefit in the management of glycemic control in clinical trials among T2D populations. These herbs include berberine, ginseng, gymnema, banaba, cinnamon, fenugreek, and kudzu, all of which are present in GlucoSupreme™ Herbal. The research team hypothesizes that GlucoSupreme™ Herbal will demonstrate superior improvements in markers of glycemic control than placebo over twelve weeks of daily supplementation among a sample of healthy adults. The research team aims to conduct a randomized, placebo-controlled, double-blinded clinical trial to evaluate this hypothesis among a diverse sample of 40 prediabetic adults, and will implement a 1:1 study allocation ratio. This study will utilize an adaptive sample size re-estimation (SSR) approach where participant enrollment may be extended beyond the originally planned sample size if interim effect size is smaller than anticipated, but still promising, thereby preserving study power; this will be determined by examination of available unblinded endpoint data by an independent statistician after 30 subjects are enrolled. Dietary supplement intervention: GlucoSupreme™ Herbal: This study will assess changes in glycemic parameters and other biomarkers over a twelve week period, with two blood draws (Baseline and 12 weeks). Additionally, an IRB-approved research associate will call each study participant at the 6-week mid-point of the study to assess compliance and collect data on any adverse events. OTHER: Placebo: The placebo utilized in this clinical trial will be formulated by the manufacturer to be as similar as possible to the active intervention in appearance, odor, and other key characteristics. Packaging for the control will be identical to packaging for the Active Comparator.