Global Stevia Institute (IMAGE) PureCircle Caption New research published in the International Journal of Food Science and Technology found steviol glycosides are not altered during the extraction and purification process to make high-purity stevia extract. The study, published on June 19, 2017, was conducted at the University of Bonn in Germany, and provides further evidence for the naturality of stevia, a zero-calorie, plant-based sweetener. Credit Global Stevia Institute Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.