Stevia Sweetleaf (Stevia Rebaudiana) - Stevia is a well-known culinary herb that is used as a sweetener. The leaves are 20 – 30 times sweeter than sugar cane, but with no calories or carbohydrates. Stevia could even be considered a medicinal herb because it nourishes the pancreas and does not raise blood glucose levels. This makes it not only safe for diabetics but also beneficial.