Herbal Dietary Supplement. (Stevia Rebaudiana). 250 Servings. No calories. No aspartame. No Acesulfame-K. Great taste. Optimum Nutrition 's Stevia Powder is extremely convenient and versatile. Stevia Powder is made with pure White Stevia Extract that has been standardized to 90% Steviosides. Steviosides are generally considered to be the active compounds in Stevia leaves. Careful plant selection, extraction and standardization help to ensure that your last scoop will taste just as good as the first! Convenient measuring scoop inside.