Stevia comes from the Stevia rebaudiana plant, which is a member of the chrysanthemum family, a subgroup of the Asteraceae family (ragweed family). There’s a big difference between the stevia you buy at the grocery store and the stevia you may grow at home.
Stevia products found on grocery store shelves, such as Truvia and Stevia in the Raw, don’t contain whole stevia leaf. They’re made from a highly refined stevia leaf extract called rebaudioside A (Reb-A). In fact, many stevia products have very little stevia in them at all. Reb-A is about 200 times sweeter than table sugar.