Stevia is an all-natural sweetener. Rebiana is the ‘generic name’ for a derivative of that natural sweetener.
Just as many drugs have both a ‘generic name’ and a ‘trade’ or brand name (e.g. the generic name is pregabalin, the trade name or brand name is Lyrica) – so rebiana is the generic name for Truvia©.
All that other stuff
Other ingredients in Banjo are those used in (and required by) the manufacturing process. All are commonly used and known to be safe. Banjo isn’t approved by the FDA – but many of those ‘other ingredients’ are commonly used in prescription products that are approved by the FDA.