Stevia (Stevia rebaudiana) is a perennial herb native to Brazil and Paraguay, and known for its sweet-tasting leaves. This purified extract is prepared from the leaves, which are rich in compounds called steviol glycosides (97% steviol glycosides). Rebaudioside A (Reb A) is the least bitter compound among these glycosides. Highly purified extracts containing Reb A are the only ones currently approved for use as sweeteners in the U.S.
Stevia extract is used as a natural, non-caloric natural sweetener.