What is Banaba extract?

Banaba extract is derived from the leaves of Lagerstroemia speciosa, a plant traditionally used in Southeast Asia. It is commonly taken as a supplement for metabolic health support.

What are the main benefits of Banaba extract?

It is most often used to support blood sugar regulation and insulin sensitivity. It also provides antioxidant compounds that may help counter oxidative stress.

What is a typical dosage for Banaba extract?

Common supplemental ranges are about 100–300 mg per day, depending on product strength and standardization. Follow the label directions and consider clinician guidance if you use glucose-lowering medications.

Does Banaba extract help with weight loss?

It may support weight management, but results can vary and evidence in humans is less consistent than in animal research. It is best viewed as an adjunct to diet and activity rather than a standalone solution.

Who should be cautious with Banaba extract?

People taking diabetes medications or insulin should use caution because Banaba may further lower blood glucose. Pregnant or breastfeeding individuals and those with medical conditions should consult a healthcare professional before use.

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Banaba Extract

Moderate study situation·7/10

A higher score indicates better study conditions, but not necessarily effectiveness.

Banaba extract (Lagerstroemia speciosa) is a plant-derived supplement used to support blood sugar control, weight management, and antioxidant defenses.

Anti-inflammatory Cardiovascular Support Antioxidant Glucose Metabolism Weight Management

dose range

100–300 mg

Divided into two doses with meals

Consumption

Take with meals to enhance absorption and reduce risk of hypoglycemia.

Not fat-soluble.

Best time

Morning and second meal doses are typical to match postprandial blood sugar peaks.

Description

Banaba extract comes from the leaves of Lagerstroemia speciosa, traditionally used in Southeast Asia for its medicinal properties. Its key bioactive component, corosolic acid, is the subject of most research, particularly for metabolic health benefits.

benefits

Main effects with level of evidence

Moderate

Note on evidence

Studies, including clinical trials and animal research, indicate positive effects on blood sugar and metabolic parameters, though large, long-term human studies are limited.

Supports blood sugar regulation

Moderate

Banaba extract improves insulin sensitivity and glucose uptake, contributing to lower fasting blood glucose in people with type 2 diabetes or insulin resistance.

Particularly relevant for: Adults with type 2 diabetes · Adults with prediabetes · People with insulin resistance

1 · Corosolic acid induces GLUT4 translocation in genetically type 2 diabetic mice 2 · Banaba and corosolic acid reduce insulin resistance in vitro and in vivo 3 · Antidiabetic and renoprotective effects of Lagerstroemia speciosa 6 · Lagerstroemia speciosa (banaba) leaves and corosolic acid: In vivo and in vitro studies on diabetes 7 · Safety and efficacy of banaba extract in the management of diabetes and metabolic syndrome

Aids in weight management

Limited

The extract may help reduce body weight and inhibit new fat cell formation, with animal studies showing stronger effects than human trials.

Particularly relevant for: Adults seeking weight management support

2 · Banaba and corosolic acid reduce insulin resistance in vitro and in vivo 5 · Examine.com: Banaba (Lagerstroemia speciosa)6 · Lagerstroemia speciosa (banaba) leaves and corosolic acid: In vivo and in vitro studies on diabetes

Provides antioxidant activity

Limited

Compounds in banaba, including ellagitannins and polyphenols, combat oxidative stress and may help reduce inflammation.

Particularly relevant for: Adults seeking general antioxidant or anti-inflammatory effects

3 · Antidiabetic and renoprotective effects of Lagerstroemia speciosa 5 · Examine.com: Banaba (Lagerstroemia speciosa)

Safety & Information

Important safety information & known risks

For educational purposes only • not medical advice

Generally well-tolerated at recommended doses; the main risk is hypoglycemia in those on antidiabetic agents.

warning notices

May cause hypoglycemia if used with other glucose-lowering agents.
Gastrointestinal discomfort is rarely reported.
Not established as safe for use in pregnancy or lactation.
Avoid use if pregnant or nursing due to lack of safety data.
Monitor blood sugar closely if using with antidiabetic drugs due to risk of hypoglycemia.
Use only with healthcare supervision if you have diabetes or are on blood sugar-lowering medications.

Known interactions with medications

Antidiabetic agents (additive effects, risk of hypoglycemia)

Contraindications / special precautions

Pregnancy
Lactation
Concurrent use with prescription antidiabetic medications without medical supervision

interactions

Important interactions between active ingredient ↔ supplement / medication / food

Banaba may enhance the effects of medications or supplements that lower blood sugar, increasing the risk of hypoglycemia.

Banaba can increase risk of low blood sugar when combined with diabetes medications.

drug · Antidiabetic medications

CautionModerate

Why

Additive effects on lowering blood glucose can result in hypoglycemia.

recommendation

Monitor blood sugar closely and adjust medication under medical supervision if starting banaba.

1 · Corosolic acid induces GLUT4 translocation in genetically type 2 diabetic mice 4 · NIH National Center for Complementary and Integrative Health: Banaba 7 · Safety and efficacy of banaba extract in the management of diabetes and metabolic syndrome

mechanisms of action

Brief explanations of how it works

Enhances glucose uptake via GLUT4 translocation

Corosolic acid promotes movement of GLUT4 receptors to the cell surface, improving cellular glucose uptake and sensitivity to insulin.

1 · Corosolic acid induces GLUT4 translocation in genetically type 2 diabetic mice 2 · Banaba and corosolic acid reduce insulin resistance in vitro and in vivo

Inhibits adipogenesis and promotes fat oxidation

Banaba constituents reduce new fat cell formation and may increase the breakdown of stored fat, contributing to weight regulation.

Exhibits antioxidant and anti-inflammatory activities

Polyphenols and ellagitannins in banaba scavenge free radicals and decrease biomarkers of inflammation and oxidative stress.

3 · Antidiabetic and renoprotective effects of Lagerstroemia speciosa 5 · Examine.com: Banaba (Lagerstroemia speciosa)

Sources & References

Primary literature and reviews on which these statements are based

7 sources

Corosolic acid induces GLUT4 translocation in genetically type 2 diabetic mice

Banaba and corosolic acid reduce insulin resistance in vitro and in vivo

Antidiabetic and renoprotective effects of Lagerstroemia speciosa

NIH National Center for Complementary and Integrative Health: Banaba

General overview and safety.

Examine.com: Banaba (Lagerstroemia speciosa)

Evidence reviews and dosage guidelines.

Lagerstroemia speciosa (banaba) leaves and corosolic acid: In vivo and in vitro studies on diabetes

Safety and efficacy of banaba extract in the management of diabetes and metabolic syndrome

Last updated: February 8, 2026

This information is for educational purposes only and does not replace medical advice.