This is a great question and one I used to ask myself since stevia is made from the green leaves.
There are green stevia powders out there. These consist of dried stevia leaves that are pulverized, require about 200 times more to sweeten than pure concentrated stevia. Green stevia leaves will impart a fresh cut grass flavor. Not what most people want....ha ha.
Our pure stevia powder is naturally extracted with 37 step alcohol & water soaking process. This formula (as opposed to water alone) extracts the sweetest part of the sweet leaf. During this soaking process the green chlorophyll in the leaves will be lost. Thus you are left with a white powder.
On a side note, after all the rinsing is complete, there is no alcohol left in the stevia. This is the most natural way of extracting the best tasting stevia from the leaf.
If you are looking for a delicious tasting stevia powder, with absolutely no bad effects or harmful ingredients, then we suggest Stevia Select.