Herbal Extract
Banaba Leaf Extract
Also known as: Lagerstroemia speciosa, Corosolic Acid Extract, Banaba
Banaba leaf extract from Lagerstroemia speciosa contains corosolic acid and has been traditionally used in Southeast Asian medicine for blood sugar management. Preliminary research suggests potential glucose-regulating properties, though clinical evidence remains limited.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Every Banaba Leaf Extract product we have scored
| # | Product | Score | Per serving |
|---|---|---|---|
| 1 | Nutricost Testosterone Complex Capsules | 84 A- | $0.57 |
| 2 | NutraBio ThermoFuel V9 | 80 A- | $0.62 |
Scored on dose accuracy, form, label transparency and third-party testing. Per-serving cost is list price divided by servings per container. No brand pays to be listed or ranked.
Common questions
How much Banaba Leaf Extract should I take?
The typical range is 32-48 mg corosolic acid daily (equivalent to 1,600-2,400 mg leaf extract at 2% standardization). Effects may develop over weeks; long-term safety data limited
When should I take Banaba Leaf Extract?
With meals or as directed. May be taken with or without food; with meals may optimize glucose-related effects.
Which form of Banaba Leaf Extract is best?
Leaf extract powder. Other forms in the catalog: Standardized extract (2% corosolic acid).
Is Banaba Leaf Extract safe?
Commonly reported: Generally well-tolerated, Mild gastrointestinal upset reported in some users.
Which Banaba Leaf Extract supplement scores highest?
Nutricost Testosterone Complex Capsules, at 84/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.
Primary uses
- Blood sugar management
- Glucose metabolism support
- Traditional antidiabetic use
How it works
- Corosolic acid may enhance glucose uptake via GLUT4 translocation
- Potential inhibition of alpha-glucosidase enzymes
- Possible insulin-mimetic activity
Dosage
- Typical range
- 32-48 mg corosolic acid daily (equivalent to 1,600-2,400 mg leaf extract at 2% standardization)
- Timing
- With meals or as directed
- With food
- May be taken with or without food; with meals may optimize glucose-related effects
- Duration
- Effects may develop over weeks; long-term safety data limited
- Special populations
- Pregnant/nursing women should avoid; individuals on diabetes medications should consult healthcare provider
Forms
- Leaf extract powder· 70/100
- Standardized extract (2% corosolic acid)· 70/100
Safety
Common side effects
- Generally well-tolerated
- Mild gastrointestinal upset reported in some users
Contraindications
- Pregnancy and breastfeeding
- Concurrent use with anti-diabetic medications may increase hypoglycemia risk
- Kidney or liver disease (limited safety data)
Products containing Banaba Leaf Extract
Top-scoring supplements in our catalog that list Banaba Leaf Extract on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Evidence notes
Several small clinical trials and in vitro studies show promise for glucose regulation, but evidence is preliminary with limited high-quality RCTs. Most data from traditional use and animal models.
Grade C: Mostly observational or small trials; mechanism is plausible but unproven at scale.
Related in Herbal Extract
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.