Learn what steviol glycosides are, how they are extracted, how purified extracts differ from whole-leaf stevia, and how to read blend labels.
9/4/2026 · 10 min read · Chris Carrillo · Reviewed by Armin Rad, Co-Founder & CTO, Aurascan · Last reviewed 9/8/2026
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Written by Chris Carrillo. Reviewed by Armin Rad, Co-Founder & CTO, Aurascan. It cites 4 sources; use the source list and methodology to check the evidence directly.
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View the sample resultSteviol glycosides are high-potency, zero-calorie sweet compounds naturally extracted from the leaves of the Stevia rebaudiana plant or produced via advanced bioconversion. Unlike whole stevia leaves, high-purity steviol glycosides (such as Reb A and Reb M) are rigorously reviewed and recognized as safe by global food safety agencies, including the research. They provide an intense sweet taste without raising blood sugar or triggering an insulin response, making them a common sugar alternative across packaged foods, tabletop sweeteners, and beverages.
Steviol glycosides are a family of chemical compounds responsible for the sweet taste of Stevia rebaudiana Bertoni, a shrub native to South America, particularly Paraguay and Brazil. Indigenous populations used the leaves of this plant for centuries to sweeten herbal teas and medicinal infusions.
At a molecular level, steviol glycosides share a common backbone called steviol, to which various sugar moieties (like glucose, rhamnose, and xylose) are attached. Depending on the number, type, and spatial arrangement of these attached sugar groups, the compounds exhibit different sweetness potencies and taste profiles.
Among the dozens of identified glycosides, the most prominent include:
Because these compounds deliver intense sweetness without containing caloric carbohydrates, they pass through the initial digestive tract without breaking down into simple sugars, offering a non-glycemic sweetening option for food manufacturers.
Food manufacturers incorporate steviol glycosides primarily to reduce or eliminate added sugars while preserving consumer-pleasing sweetness. With rising public health focus on metabolic conditions, cardiovascular health, and obesity, packaged food brands increasingly use high-intensity sweeteners to hit "zero sugar" or "low calorie" targets on nutrition labels.
Unlike bulk sugar, which provides texture, browning, and moisture retention in baked goods, steviol glycosides function solely as high-intensity flavor modifiers. Because they are 200 to 400 times sweeter than sucrose, a tiny fraction of a gram replaces several teaspoons of sugar.
You will frequently find steviol glycosides listed on ingredient panels across various categories, including:
In contrast to artificial high-intensity sweeteners like those explored in our guide on what is sucralose? uses, safety, baking risks, and labels or what is aspartame? uses, safety, and labeling explained, steviol glycosides are marketed heavily around their plant-based origin.
The production of food-grade steviol glycosides requires multi-stage processing to isolate sweet molecules and remove unpalatable plant compounds, waxes, and chlorophyll. The conventional manufacturing pathway involves the following stages:
In recent years, food technologists developed non-agricultural methods to produce premium minor glycosides like Reb M at scale. As documented in food science reviews, these newer methods utilize genetically engineered yeasts (Saccharomyces cerevisiae) in closed fermentation tanks to produce glycosides directly from simple sugars, or employ immobilized enzymes to bioconvert abundant Reb A into Reb M. Both approaches yield identical chemical molecules without requiring vast agricultural acreage.
High-purity steviol glycosides have undergone extensive toxicological, metabolic, and clinical evaluations worldwide. The consensus among premier food safety authorities is that purified stevia extracts are safe for human consumption within established limits.
As of September 4, 2026, the core regulatory status of high-purity steviol glycosides remains stable and broadly approved for food and beverage use, with no new bans enacted. In its recent evaluation, the European Food Safety Authority (EFSA) reaffirmed the established acceptable daily intake (ADI) of 4 mg/kg body weight per day as steviol equivalents, declining requests to increase the threshold and advising caution regarding proposed use extensions that could exceed the ADI in young children. Meanwhile, regulatory activity from both studies and the U.S. Food and Drug Administration (FDA) has primarily focused on updating specifications and Generally Recognized as Safe (GRAS) notices to clear novel manufacturing methods, including microbial fermentation and enzyme-catalyzed bioconversion for specific glycosides like Rebaudioside M.
Human digestive enzymes in the stomach, small intestine, and saliva cannot cleave the complex bonds in steviol glycosides. Consequently, the sweet molecules travel intact into the colon. There, commensal gut bacteria (primarily from the Bacteroidaceae family) hydrolyze the attached sugar moieties, leaving behind the core steviol backbone.
The released steviol is absorbed through the intestinal wall into the bloodstream and carried to the liver. In the liver, it undergoes routine phase II detoxification (glucuronidation) to form water-soluble steviol glucuronide, which is excreted harmlessly in urine and bile. Because the glucose units are consumed by gut microbes rather than entering the human bloodstream, steviol glycosides cause zero glycemic response.
A critical distinction exists between whole stevia leaves and purified steviol glycosides. The research has repeatedly denied GRAS status for crude, unrefined stevia leaf extracts and whole dried leaves for use as general food additives. Unrefined leaf preparations contain hundreds of uncharacterized phytochemicals, volatile oils, and variable compounds for which comprehensive toxicology and reproductive safety data remain incomplete. High-purity extracts (minimum 95% steviol glycosides), however, have consistently demonstrated no genotoxic, carcinogenic, or adverse reproductive effects in peer-reviewed animal and human trials.
For the vast majority of consumers, high-purity steviol glycosides are well-tolerated and metabolic byproducts clear smoothly from the body. However, certain nuances exist regarding individual tolerance and specific population groups.
Scientific uncertainty: While short- and medium-term clinical safety is well established, evidence cannot conclusively establish every subtle effect of lifetime, high-dose steviol exposure on distinct individual microbiome profiles, meaning research into personalized gut flora interactions remains ongoing.
Deciphering package labels requires looking past marketing buzzwords on the front of the box and examining the mandatory ingredient panel on the back.
Brands frequently splash "Sweetened with Stevia" across the front panel in large green letters. When you turn the box over, the ingredient deck may reveal that the dominant ingredient is not stevia at all, but another sweetener or bulking agent.
Because pure steviol glycosides are so concentrated, a single packet would contain only an invisible speck of powder. To fill a standard 1-gram tabletop sachet, manufacturers blend a fraction of a milligram of stevia extract with bulky carriers:
On European and international labels, steviol glycosides may be identified by their authorized food additive number, E960 (with sub-classifications such as E960a for plant-extracted glycosides and E960c for enzymatically produced glycosides). On U.S. and Canadian labels, look for terms like:
If you want to quickly verify whether a packaged product contains hidden filler carbohydrates, sugar alcohols, or pure extracts, scanning the product barcode using the Aurascan food label scanner provides an instant breakdown of every sweetening agent present.
If you dislike the lingering licorice-like aftertaste of certain stevia extracts or prefer different cooking and baking characteristics, several alternative sweetening agents are widely available:
By checking ingredient lists carefully, you can choose the sweetening agent that aligns best with your metabolic goals, taste preferences, and digestive tolerance.
No. Steviol glycosides are specific, highly purified sweet molecules (such as Reb A or Reb M) extracted from the plant to a purity of at least 95%. Raw stevia refers to whole, dried, or unrefined stevia leaves, which contain hundreds of other uncharacterized plant compounds and are not approved as general food additives by major regulators like the FDA.
No. Human digestive enzymes cannot break down steviol glycosides, so they pass into the colon without releasing glucose into the bloodstream. Because no glucose is absorbed from the molecule, steviol glycosides do not elevate fasting blood sugar or stimulate insulin release.
The bitter aftertaste is primarily caused by specific glycosides like stevioside and Reb A interacting with bitter taste receptors (TAS2Rs) on the human tongue. Newer extracts focusing on Rebaudioside M (Reb M) and Rebaudioside D (Reb D) bind far less to bitter receptors, providing a cleaner, sugar-like taste profile.
Purified steviol glycosides are heat-stable up to 200°C (392°F), making them suitable for cooking. However, because they lack the physical volume, bulk, and moisture-retaining properties of sugar, they will not brown, caramelize, or provide the structural bulk needed in traditional baked goods unless combined with a bulking carrier.
The Acceptable Daily Intake established by the European Food Safety Authority (EFSA) and the Joint FAO/WHO Expert Committee on Food Additives (JECFA) is 4 mg per kilogram of body weight per day, expressed as steviol equivalents. For an adult weighing 70 kg (154 lbs), this equals roughly 280 mg of steviol equivalents daily.
Almost never. Because pure steviol glycosides are hundreds of times sweeter than sugar, an individual packet would contain a microscopic amount of powder. Brands blend small quantities of stevia extract with bulking carriers like erythritol, dextrose, or inulin to allow standard teaspoon-for-teaspoon measuring.
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