Banaba leaf has long been used as an herbal remedy for various health concerns. One main benefit of banaba leaf is its lowering the amount of sugars in the blood and increasing the amount of insulin. Banaba leaf contains corosolic acid, which promotes insulin action to transport sugar into the cells. A side effect of banaba leaf supplementation is the decrease of appetite for weight control as cravings for carbohydrates decreases when sugars are delivered into the cells by insulin.