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Gymnema sylvestre (Gurmar)
An Ayurvedic herb studied for supporting blood-sugar control and for temporarily blunting sweet taste and sugar cravings.
What the evidence says
Gymnema Sylvestre doesn't have enough studies with structured effect-size data yet to pool a verdict. Browse the studies below for individual findings.
Most evidence is from high-quality meta-analyses and randomised trials published 2007–2026 with a typical study size of 50 participants.
Based on 16 studies · 2 meta-analyses · 8 RCTs · 50 total participants
Confidence
High confidenceBy outcome
Two meta-analyses and several RCTs show modest reductions in fasting glucose and HbA1c plus short-term reduced sweet cravings, but effect sizes are moderate and the underlying trials are small and heterogeneous.
3 trials ongoing or recruiting · 8 completed on ClinicalTrials.gov
2 of the completed trials have posted results
Registered trials show research momentum for Gymnema Sylvestre, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Oct 2026
Gymnema sylvestre is a woody climbing plant used in Ayurveda, where its Hindi name 'gurmar' means 'sugar destroyer.' Its gymnemic acids transiently block sweet-taste receptors on the tongue (so sugar tastes less sweet) and are studied for reducing intestinal glucose absorption and supporting insulin activity.
Randomized trials and meta-analyses suggest modest improvements in fasting glucose and HbA1c in type 2 diabetes, and short trials show reduced sweet-food cravings. Effects are moderate and the trial base is heterogeneous.
Gymnemic acids transiently bind sweet-taste receptors, reducing the perceived sweetness of food and sugar cravings.
May inhibit intestinal sugar transporters, lowering the amount of glucose absorbed after meals.
Animal and clinical data suggest support for insulin secretion and pancreatic beta-cell function.
Monitor blood glucose closely; medication may need adjustment to avoid hypoglycemia.
Not well studied — avoid supplemental doses without medical advice.
Additive blood-sugar lowering — monitor for hypoglycemia and coordinate with your clinician.
Tip: Take with food; reduce dose
Tip: Monitor blood glucose; adjust medication with your clinician
Gymnema Sylvestre has an evidence score of 5.5/10 — moderate evidence based on 16 indexed studies, including 2 meta-analyses. An Ayurvedic herb studied for supporting blood-sugar control and for temporarily blunting sweet taste and sugar cravings. Representative study: PMID 34467577.
The commonly studied dose of Gymnema Sylvestre is 200-400mg standardized extract (≥25% gymnemic acids) 1-2x daily, or 2-4g dried leaf. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take Gymnema Sylvestre is with meals. Taking it with food is preferred. Taken with or just before carbohydrate-containing meals to blunt post-meal glucose and reduce sweet cravings.
Gymnema Sylvestre has a safety rating of "moderate". That is a category, not a measure of individual risk, and there are precautions worth knowing. Reported side effects include hypoglycemia (with diabetes meds), mild GI upset. How often they occur is not established for all of them. Use caution if any of these apply to you: Use of insulin or sulfonylureas without medical supervision (hypoglycemia risk).
Green Tea Extract
Likely helpsConcentrated catechins from green tea, studied for metabolism, fat oxidation, blood lipids and antioxidant markers.
Cinnamon
Too few graded studiesA polyphenol-rich spice studied mainly for modest improvements in blood sugar and blood lipids; choose Ceylon to limit coumarin.
Glucomannan
Likely helpsAbsorbs up to 50x its weight in water, creating strong satiety — supports weight loss, blood sugar regulation, and cholesterol reduction.
Fenugreek
Likely helpsTraditional herb with evidence for supporting testosterone, libido, blood sugar control, and lactation.
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Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 16 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.