Nascent – SoPure Stevia. Reb E is a new stevia leaf extract that has less off-notes compared to Reb A. New stevia-based natural flavors may provide more mouthfeel and flavor-blocking capabilities, as well as enhance sweetness. FEMA GRAS Status. The Global Food Forums Technology Snapshot Advisory Panel selected this ingredient for a Technology Snapshot presentation for the 2020 Clean Label Conference.