Banaba leaf (corosolic acid)
What it is
Contains corosolic acid, which activates glucose transporters to help cells absorb sugar more efficiently. A 2024 review of 7 trials found banaba leaf significantly reduces fasting blood sugar and post-meal glucose in people with type 2 diabetes and prediabetes. Effects are modest but consistent. Generally well tolerated with no serious side effects reported. Can enhance blood sugar medications.
Dose
32–48 mg/day standardised to 1% corosolic acid; take before carbohydrate-containing meals
Time of day & tips
Take 15–30 min before carbohydrate-heavy meals (typically lunch and dinner). Monitor blood sugar closely if on diabetes medication as banaba enhances their effect.
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