Banaba is a medicinal plant that grows in India, Southeast Asia and the Philippines. As a weight loss aid, a handful of studies in humans have suggested that Banaba can help promote moderate weight loss when used with diet and exercise.
At suggested doses, 8-48mg per day, no adverse side effects are expected from banaba extract. Higher doses should be avoided, however, to prevent possible hypoglycemic effects (headache, dizziness, fatigue) commonly associated with extremely low blood glucose levels.
Doses of banaba extract in the range of 16-48mg per day, consumed in divided doses with meals, are effective in reducing blood glucose and insulin levels. Higher doses should be avoided due to the potential for hypoglycemia (low blood sugar).