Banaba Leaf: Uses, Benefits, Dosage & Safety

Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy

What is Banaba Leaf?

Banaba (Lagerstroemia speciosa) is a tropical tree whose leaves have been used in the Philippines for diabetes and weight. Its main studied compound is corosolic acid, and extracts are often standardised to a percentage of it.

What Banaba Leaf is commonly used for

In supplements, Banaba Leaf is most often included for blood sugar & metabolism support. It is used as nutritional support, not as a treatment for any medical condition — the distinction matters, because the claims on a sales page are often stronger than the evidence allows.

How Banaba Leaf works

Corosolic acid appears to improve cellular glucose uptake and insulin sensitivity, which underlies banaba's blood-sugar marketing. Some products also contain ellagitannins that may contribute. The effect is modest where it appears.

What the evidence says

Here's an honest snapshot of what published research suggests about Banaba Leaf — including where the evidence is limited.

• Several small human studies suggest banaba or corosolic acid can modestly lower post-meal and fasting blood sugar. (PubMed research)
• The trials are small and short, so the evidence, while promising, is not strong. (PubMed research)

Typical dosage used in studies

Studies have used extracts providing roughly 10-48 mg of corosolic acid per day. This is research information for context, not a recommendation — confirm what's appropriate for you with a healthcare professional.

Side effects and safety

Generally well tolerated in short-term studies; long-term safety data are limited, and it may lower blood sugar.

Medication interactions and who should avoid Banaba Leaf

Sources & further reading

The summary above is drawn from peer-reviewed research and authoritative references. For general, authoritative background you can also consult:

• PubMed research on Banaba Leaf
• NIH Office of Dietary Supplements
• NIH National Center for Complementary and Integrative Health
• MedlinePlus (U.S. National Library of Medicine)

Frequently asked questions

What is banaba used for?

Mainly blood-sugar support, via its corosolic acid content.

Does it work?

Small studies are modestly encouraging, but the evidence base is limited.

Is banaba safe?

Short-term use is well tolerated; it may lower blood sugar.

Can I combine it with metformin?

Only with medical supervision, due to additive blood-sugar lowering.