stevia is banned in a couple of countries (controversial) but is GRAS however, research is needed to demonstrate total safety.

it's also classed as a supplement instead of an additive by the FDA. thing is, these governing bodies for food regulations are so affected by major food corporations that some decisions made by them can be controversial at times.

also, i have tasted pure stevia before. tastes nasty. it's 300 times sweeter than sugar and if u put some on ur tongue it will taste so sweet it's bitter and leaves a strong odd aftertaste. im in the opinion that it will not totally emulate the taste and feel of sugar.