Guayakí uses a version of stevia leaf extract called reb A, which tends to have less of an aftertaste than the more common ...

These include: 95% minimum purity steviol glycosides Rebaudioside A (also known as Reb A) Stevioside Rebaudioside D (also ...

Aside from Reb-A, there are a whole bunch of other compounds produced in the leaves of the stevia plant that have sweet-tasting properties, like stevioside, Reb-B through Reb-F, and Reb X.