Rebiana is the trade name for high-purity rebaudioside A, a Steviol glycoside

Steviol glycoside

The steviol glycosides are responsible for the sweet taste of the leaves of the stevia plant .These compounds range in sweetness from 40 to 300 times sweeter than sucrose.They are heat-stable, pH-stable, and do not ferment...

 which when used as a non-nutritive sweetener is 200 times sweeter than sugar. It is the primary source of sweetness in the Truvia

Truvia

Truvia is a stevia-based sugar substitute developed jointly by Coca-Cola and Cargill. It is currently distributed and marketed by Cargill as a tabletop sweetener and as a food ingredient. Because it comes from the stevia plant, Cargill classifies it as a natural sweetener in addition to being a...

 sweetener brand. Rebiana is derived from Stevia

Stevia

Stevia is a genus of about 240 species of herbs and shrubs in the sunflower family , native to subtropical and tropical regions from western North America to South America. The species Stevia rebaudiana, commonly known as sweetleaf, sweet leaf, sugarleaf, or simply stevia, is widely grown for its...

 leaves by steeping them in water. Cargill

Cargill

Cargill, Incorporated is a privately held, multinational corporation based in Minnetonka, Minnesota. Founded in 1865, it is now the largest privately held corporation in the United States in terms of revenue. If it were a public company, it would rank, as of 2011, number 13 on the Fortune 500,...

has filed patents which give it exclusive rights to sell Rebiana in beverages.