Stevia Rebaudiana Is Number 1!
stevia rebaudiana
There are more than 100 species of Stevia plant, but one stands out for its excellent properties as a sweetener, namely Stevia Rebaudiana, which contains the compound rebaudioside A, the sweetest-flavored component of the stevia leaf. Most importantly, Rebaudioside A is free of aftertaste.

Is Stevia Rebaudiana Safe?
Some long-term studies have been done to document Stevia's health effects in humans. A review conducted by toxicologists at UCLA, which was commissioned by nutrition advocate Center for Science in the Public Interest (Kobylewski & Eckhert, 2008), raised concerns that Stevia could contribute to cancer.
Always consult your medical practitioner, before taking any natural supplements!