Isostevia 150 Sticks. Sweetener from stevia. Thanks to its unique composition, enhanced with natural ingredients from the stevia plant, Isostevia is the ideal sweetener, an alternative to sugar for those who watch their diet. The naturally sweet taste of Isostevia makes it an ideal choice for dieters who want to replace sugar and artificial sweeteners with a guilt-free, calorie-free sweetener of natural origin. Isostevia does not alter the taste and can replace sugar in all recipes, such as drinks, sweets and desserts, because it is also heat resistant.