<human>: Is the calorie-free sweetener stevia safe?
<bot>: Stevia is a natural, non-caloric sweetener derived from the leaves of the Stevia rebaudiana plant. It has been used for centuries in South America as a natural alternative to sugar. Studies have shown that it does not have any adverse effects on blood glucose levels and may even help reduce them. Additionally, studies suggest that it may also be beneficial for weight loss.