Gudmar

Names and identification

Language	Name
English	Gudmar

How does it work?

• Gymnemic acids increase insulin secretion by stimulating Ca2+ influx through voltage-gated calcium channels and protein kinase activation, raising intracellular calcium.
• Alternative mechanism: increases membrane porosity (disruption) and permeability of beta-cells, promoting insulin release independently of classical Ca2+ channel cascade.
• Studies have reported regeneration of islet cells and increased numbers of pancreatic beta-cells and islets of Langerhans.
• Increases utilization of glucose by enhancing activities of enzymes responsible for insulin-dependent glucose utilization pathways.
• Inhibits glucose absorption from intestine via gymnemic acid binding to intestinal receptors.
• Gymnemic acids structurally mimic glucose molecules and compete for sweet taste receptors on the tongue, blocking sweet taste perception.

Modern Research (Meta-Analysis)

Total PubMed publications found: 418

Key Research Papers

1. A systematic review of Gymnema sylvestre in obesity and diabetes management.

Authors: Pothuraju Ramesh, Sharma Raj Kumar, Chagalamarri Jayasimha et al. Journal: Journal of the science of food and agriculture (2014) PMID: 24166097

The prevalence of obesity is associated with many health-related problems. Currently, more than 300 million people are considered to be obese. According to the World Health Organization (WHO), by 2030, 87 and 439 million people will be affected in India and the world, respectively. Today, herbal medicines are gaining interest in the treatment of obesity and diabetes, because of their minimal side effects. Gymnemic acid - an active component isolated from Gymnema sylvestre - has anti-obesity and antidiabetic properties, decreases body weight and also inhibits glucose absorption. Several components extracted from Gymnema prevent the accumulation of triglycerides in muscle and liver, and also decrease fatty acid accumulation in the circulation. In this paper, an attempt has been made to revie…

Keywords: Gymnema sylvestre, diabetes, metabolism, obesity

2. Adverse effects of herbal medicines: an overview of systematic reviews.

Authors: Posadzki Paul, Watson Leala K, Ernst Edzard Journal: Clinical medicine (London, England) (2013) PMID: 23472485

This overview of systematic reviews (SRs) aims to evaluate critically the evidence regarding the adverse effects of herbal medicines (HMs). Five electronic databases were searched to identify all relevant SRs, with 50 SRs of 50 different HMs meeting our inclusion criteria. Most had only minor weaknesses in methods. Serious adverse effects were noted only for four HMs: Herbae pulvis standardisatus, Larrea tridentate, Piper methysticum and Cassia senna. The most severe adverse effects were liver or kidney damage, colon perforation, carcinoma, coma and death. Moderately severe adverse effects were noted for 15 HMs: Pelargonium sidoides, Perna canaliculus, Aloe vera, Mentha piperita, Medicago sativa, Cimicifuga racemosa, Caulophyllum thalictroides, Serenoa repens, Taraxacum officinale, Camelli…

3. The effect of Gymnema sylvestre supplementation on glycemic control in type 2 diabetes patients: A systematic review and meta-analysis.

Authors: Devangan Suneel, Varghese Bincy, Johny Ebin et al. Journal: Phytotherapy research : PTR (2021) PMID: 34467577

This systematic review and meta-analysis aims to find the effect of Gymnema sylvestre (GS) supplementation on glycemic control in type-2 diabetes mellitus (T2DM). PubMed, Cochrane library, Google Scholar, and Science Direct were searched from inception to June 2020 to identify the studies that reported GS supplementation on glycemic parameters. Standardized mean difference (SMD) was calculated by comparing the post-intervention data with baseline data. SMDs with 95% confidence intervals (CIs) were pooled using a random-effects model. Our meta-analysis consisting of 10 studies with a total of 419 participants showed that GS supplementation significantly reduces fasting blood glucose (FBG) (SMD 1.57 mg/dl, 95% CI 2.22 to -0.93, p < .0001, I…

Keywords: Gymnema sylvestre, glycemic control, lipid profile, meta-analysis, systematic review, type-2 DM

5. Comparative Effects of

Authors: Bandala Cindy, Carro-Rodríguez Jazmín, Cárdenas-Rodríguez Noemí et al. Journal: Nutrients (2024) PMID: 39064727

METHODOLOGY: We performed a comparative study in 50 adult Mexican patients with obesity treated with GS or BBR for 3 months. The baseline and final biochemical parameters, body composition, blood pressure, gene expression of Res, Ome, Vis, and Ap, and safety parameters were evaluated. CONCLUSION: In patients with obesity, BBR has a better effect on body composition, blood pressure, and the gene expression of adipokines related to metabolic risk, while GS has a better effect on fasting glucose and adipokines related to insulin resistance, with minimal side effects…

Keywords: Gymnema sylvestre, adipokine, apelin, berberine, body composition, fasting glucose, gene expression, obesity, omentin, resistin

6. Gymnema sylvestre for Diabetes: From Traditional Herb to Future’s Therapeutic.

Authors: Tiwari Pragya, Ahmad Khurshid, Baig Mohammad Hassan Journal: Current pharmaceutical design (2017) PMID: 27834124

Diabetes has increased at an unprecedented rate and is fast emerging as a global threat worldwide. The focus on pharmacological studies pertaining to diabetes has seen a remarkable shift from conventional medicines to therapeutics employing bioactive phytomolecules from natural sources. The prospective effectiveness of natural products together with their low cost and minimal side effects has revolutionized the entire concept of drug discovery and management programs. One such beneficial herb is Gymnema sylvestre, possessing remarkable hypoglycemic properties and forms the platform of diabetes therapeutics in the traditional system of medication. The present article discusses the significance of G. sylvestre in diabetes management, the herbal-formulations from the herb together with its st…

Keywords: Computational biology, Gymnema sylvestre, PPARγ, diabetes, drug-discovery, herbal formulations, toxicity determination

7. Discovery of rare variants associated with blood pressure regulation through meta-analysis of 1.3 million individuals.

Authors: Surendran Praveen, Feofanova Elena V, Lahrouchi Najim et al. Journal: Nature genetics (2020) PMID: 33230300

Genetic studies of blood pressure (BP) to date have mainly analyzed common variants (minor allele frequency > 0.05). In a meta-analysis of up to ~1.3 million participants, we discovered 106 new BP-associated genomic regions and 87 rare (minor allele frequency ≤ 0.01) variant BP associations (P < 5 × 10…

What do recent studies show?

• Devangan S, Varghese B, Johny E and others 2021. The effect of Gymnema sylvestre supplementation on glycemic control in type 2 diabetes patients: A systematic review and meta-analysis. Phytotherapy research : PTR. PMID 34467577 · doi:10.1002/ptr.7265
  Meta-analysis of 10 studies (419 participants) showed Gymnema sylvestre supplementation significantly reduces fasting blood glucose (FBG), postprandial blood glucose (PPBG), and glycated hemoglobin (HbA1c) compared to baseline.
• Buccato DG, Ullah H, De Lellis LF and others 2024. Efficacy and Tolerability of a Food Supplement Based on Zea mays L., Gymnema sylvestre (Retz.) R.br.ex Sm, Zinc and Chromium for the Maintenance of Normal Carbohydrate Metabolism: A Monocentric, Randomized, Double-Blind, Placebo-Controlled Clinical Trial. Nutrients. PMID 39125340 · doi:10.3390/nu16152459
  Monocentric RCT on 81 individuals with impaired fasting glucose (98-125 mg/dL) showed daily supplementation over 3 months led to highly significant reduction (p < 0.001) in FBG and HbA1c levels compared to placebo.
• Turner S, Diako C, Kruger R and others 2022. The Effect of a 14-Day gymnema sylvestre Intervention to Reduce Sugar Cravings in Adults. Nutrients. PMID 36558446 · doi:10.3390/nu14245287
  Intervention with 4 mg Gymnema sylvestre containing 75% gymnemic acids plus fiber/vitamin supplement reduced sweet food intake and discretionary sugar consumption in free-living adults.
• Miranda DG, Tomé FM, Miguel MMV and others 2025. Gymnema sylvestre as a Potential Anti-Inflammatory and Anti-Biofilm Agent Against Anaerobic Infections: An In Vitro Study. Plants (Basel, Switzerland). PMID 40006756 · doi:10.3390/plants14040497
  First study to evaluate antimicrobial activity of Gymnema sylvestre extract against planktonic culture and biofilms of anaerobic bacteria, expanding applications beyond traditional diabetes use.
• Al-Romaiyan A, Liu B, Persaud S and others 2020. A novel Gymnema sylvestre extract protects pancreatic beta-cells from cytokine-induced apoptosis. Phytotherapy research : PTR. PMID 31515869 · doi:10.1002/ptr.6512
  Novel extract demonstrated protective effects on pancreatic beta-cells against cytokine-induced programmed cell death.

Recent safety updates

• May enhance glucose-lowering effects of antidiabetic drugs, risking hypoglycemia if not monitored.
• Inhibits CYP1A2 and induces CYP2C9 metabolic activity: potential interactions with medications metabolized through these pathways.
• Possibly safe when taken appropriately for up to 20 months at standard doses.
• Doses of 100 mg/kg body weight or below recommended; higher doses (300-600 mg/kg) associated with significant alterations in biochemical and hematological parameters and potential liver/kidney effects.
• European Food Safety Authority (EFSA) risk assessment warns that Gymnema-based food supplements combined with antidiabetic drugs may pose risks due to herb-drug interactions.
• Not recommended during pregnancy or breastfeeding due to insufficient safety data.

What is it made of?

The marker compounds are listed under Dosage forms and preparation, below.

Dosage forms and preparation

Dosage Forms: Churna (leaf powder), Kashayam (decoction), Ghana Vati (solid extract tablet), Capsule (standardized extract), Tablet, Kwath Ghana, Tincture

Standard Dosage: 3-6g leaf powder twice daily; 50-100ml decoction; 500mg standardized extract (25% gymnemic acids) twice daily; 400mg extract capsule 20 minutes before meals

Optimal Timing: 20-30 minutes before meals (allows gymnemic acids to reach intestinal absorption sites before food glucose arrives); 1-2 tablets/capsules before each main meal; leaf chewing before meals in traditional practice

Storage: Dried leaf and powder: airtight containers below 25 deg C, protected from moisture. Standardized extracts: moisture-proof packaging with desiccant. Gymnemic acids are relatively stable under normal storage conditions.

Marker Compounds: Gymnemic acid I-XVIII (triterpenoid saponins), Gymnemasaponin I-V, Gymnemagenin (aglycone), Gurmarin (peptide, sweet-taste suppressor), Conduritol A, Stigmasterol

Synergistic Combinations

• With Karela (Momordica) for synergistic hypoglycemic action
• With Daruharidra (berberine) for multi-target anti-diabetic formulation
• With Vijaysar (Pterocarpus), traditionally combined in formulations aimed at glucose metabolism
• With Methi (fenugreek) for glycemic control through complementary mechanisms
• With Shilajit for metabolic syndrome support