The active compands of stevia are steviol glycosides (mainly stevioside and rebaudioside), which have up to 150 times the
sweetness of sugar,are heat-stable,PH-stable,and not fermentable.
Stevia rebaudioside include Rebaudiosede A(RA), Rebaudioside B(RB), Rebaudioside C, etc.
Rebaudioside A(RA) is the one with the most quantity, the highest sweetness and the best taste of Stevia rebaudioside. And also
the RA99% is the highest prurity extracted from RA.