Truvia and Pure Via have now been FDA approved as sweeteners. These are both 95% rebaudioside --the active sweet-tasting chemical in the Stevia leaf.
Both versions contain sugar alcohol and therefore about 3 grams of carb per packet. On the strict (weight loss diet) use these sweeteners with caution.
Remember that only the LIQUID non-caloric sweeteners have ZERO grams.
Wisdom Natural is marketing a sweetener that's also either stevia or derived from stevia. At the present time they will not reveal what is in Sweet Leaf.
All three are acceptable on the liberal diet.
