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Banaba (Lagerstroemia speciosa / Corosolic Acid)
A tropical leaf (corosolic acid) with an insulin-like, GLUT4-mediated glucose-uptake mechanism and a small human signal for lowering post-meal blood glucose — but human evidence is limited and mostly small/short trials.
What the evidence says
Banaba 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 randomised trials published 2003–2026 with a typical study size of 31 participants.
Based on 11 studies · 5 RCTs · 31 total participants
Confidence
Moderate confidenceBy outcome
A plausible insulin-like GLUT4 mechanism plus one small controlled human trial (n=31) showing lower post-meal glucose, but the human evidence is thin and the rest is review, cell, and animal data.
1 trial ongoing or recruiting · 4 completed on ClinicalTrials.gov
1 of the completed trials have posted results
Registered trials show research momentum for Banaba, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed.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
Banaba (Lagerstroemia speciosa) is a tropical tree whose leaves contain corosolic acid and ellagitannins. These act in an insulin-like way, promoting GLUT4-mediated glucose uptake, which is the basis for its use in blood-sugar support.
A small controlled human trial found corosolic acid lowered post-challenge (post-meal) glucose, and animal/cell studies show anti-diabetic and anti-obesity activity. The honest picture: the human evidence base is thin — small, short trials — so it sits at the emerging end despite a plausible mechanism.
Often standardized to 1-2% corosolic acid.
Corosolic acid promotes insulin-like GLUT4 translocation, increasing cellular glucose uptake.
Ellagitannins may slow carbohydrate digestion, blunting post-meal glucose.
How Banaba works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Monitor blood glucose — additive lowering possible.
Avoid — insufficient data.
Additive glucose-lowering — monitor for hypoglycemia.
Tip: Monitor blood glucose
Tip: Take with food
Banaba has an evidence score of 4/10 — emerging evidence based on 12 indexed studies. A tropical leaf (corosolic acid) with an insulin-like, GLUT4-mediated glucose-uptake mechanism and a small human signal for lowering post-meal blood glucose — but human evidence is limited and mostly small/short trials. Representative study: PMID 16549220.
Dosing for Banaba: Banaba leaf extract standardized to corosolic acid; commonly ~10-48mg corosolic acid daily (e.g. higher-percentage extracts, or a larger dose of a 1-2% extract). A typical label range, the one cited trial gave a single 10 mg dose of corosolic acid 5 minutes before a 75 g glucose load. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take Banaba is with meals. Take it with food. Taken before/with carbohydrate-containing meals to blunt post-meal glucose.
Banaba 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 with diabetes medication (additive glucose-lowering); Pregnancy/breastfeeding (insufficient data).
Cinnamon
Too few graded studiesA polyphenol-rich spice studied mainly for modest improvements in blood sugar and blood lipids; choose Ceylon to limit coumarin.
Fenugreek
Likely helpsTraditional herb with evidence for supporting testosterone, libido, blood sugar control, and lactation.
Gymnema Sylvestre
Too few graded studiesAn Ayurvedic herb studied for supporting blood-sugar control and for temporarily blunting sweet taste and sugar cravings.
Psyllium Husk
Likely helpsGel-forming soluble fiber that lowers LDL cholesterol, regulates blood sugar, and promotes digestive regularity.
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Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 11 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.
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