Banaba extract comes from the leaves of the Lagerstroemia speciosa tree. Manufacturers standardize the extract to corosolic acid or ellagitannins, compounds that affect how the body handles carbohydrates. Standardization sets this concentrated extract apart from whole leaf preparations and allows more precise dosing.
People usually take banaba before meals to help keep blood sugar levels within a normal range. Capsules and tablets are the common forms. Product strengths differ, so the best guidance is the label on your bottle.
For most people, the extract is easy on the system, though mild stomach upset can happen. A real risk is blood sugar dropping too low, especially when combined with diabetes medications. Safety in pregnancy and during breastfeeding lacks solid data, so a cautious approach and professional advice make sense.