Stevia

botanicalrebaudioside A

What is it

Stevia is a non-caloric natural sweetener derived from the leaves of Stevia rebaudiana, a plant native to South America. The sweet taste comes primarily from steviol glycosides, particularly stevioside and rebaudioside A, which are 200 to 400 times sweeter than sucrose.

How it works

Steviol glycosides are not metabolized for energy by the human digestive system. They pass through the small intestine intact, then are hydrolyzed by colonic bacteria into steviol, which is absorbed, conjugated in the liver, and excreted in urine. This metabolic pathway means stevia provides essentially no calories and does not raise blood glucose or insulin. The primary glycosides used in commercial stevia products are stevioside (slightly bitter), rebaudioside A (cleanest sweet taste), and rebaudioside M and D (modern refined extracts with reduced aftertaste). Different products use different glycoside profiles to optimize taste. Stevia has been approved as a sweetener by the FDA, EFSA, and most regulatory bodies worldwide for high-purity steviol glycosides (95 percent or greater purity). The acceptable daily intake (ADI) is 4 mg/kg body weight (expressed as steviol equivalents), which is a high threshold rarely approached by typical use.

Evidence for 4 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Sugar replacement (calorie reduction)

Grade A

Strong evidence

Stevia effectively replaces sugar in foods and beverages with essentially no calories, supporting weight management and reduced sugar intake as part of a balanced diet.

Blood glucose control

Grade B

Good evidence

Stevia does not raise blood glucose or insulin. Replacing sugar with stevia in the diet supports glycemic control in people with diabetes or prediabetes.

Dental health

Grade B

Good evidence

Stevia is not fermented by oral bacteria, so it does not contribute to tooth decay. Replacing sugar with stevia in beverages supports dental health.

Blood pressure (modest)

Grade C

Moderate evidence

Some studies suggest modest blood pressure reductions with stevia consumption in hypertensive individuals. Effects are small and may relate to stevioside-specific activity. Most modern stevia products use rebaudioside A.

5 commercial forms

High-purity steviol glycoside extract (powder)

Concentrated and standardized; FDA recognized as GRAS.

Highly refined extract (typically 95 percent or greater steviol glycoside purity). Forms used in most commercial stevia sweeteners.

Liquid stevia

Diluted glycosides in water or glycerin.

Concentrated liquid drops. Easy to dose for beverages. Some products use alcohol or glycerin as carrier.

Stevia and erythritol blends

Volume-matched sugar replacement with improved taste.

Combines stevia with erythritol or other bulking agents for 1:1 sugar replacement in baking. Improved taste over straight stevia at high concentrations.

Whole stevia leaf

Traditional form; not approved as sweetener in US.

Dried and ground leaves. Used as an herbal tea or in traditional South American preparation. Sweetness less consistent than refined glycosides.

Reb A or Reb M only

Single-glycoside extracts for cleanest sweet taste.

Highly refined products containing primarily rebaudioside A or rebaudioside M. Cleanest taste profile but more expensive.

Dosage

There is no required intake; stevia is consumed as a sweetener to taste. The Joint FAO/WHO Expert Committee established an Acceptable Daily Intake of 4 mg/kg body weight of steviol equivalents (about 12 mg/kg of stevioside or rebaudioside A). For a 70 kg person, this corresponds to roughly 280 mg of steviol per day, far above typical sweetener use.

When and how to take it

Stevia can be consumed any time of day as a sweetener for foods and beverages. It does not affect blood glucose, so timing relative to meals does not have metabolic implications. Some people find combining stevia with other sweeteners (erythritol, monk fruit) improves taste profile.

Safety

High-purity stevia glycosides have been evaluated as safe by major regulatory bodies. Reported side effects are uncommon and mild, including bloating, gastrointestinal upset, and rare allergic reactions in people sensitive to plants in the Asteraceae (ragweed) family. Whole stevia leaf is less standardized and has not been approved by the FDA for use as a sweetener in the US.

Who should be cautious

People with allergies to plants in the Asteraceae family (ragweed, daisies, marigolds) may be sensitive to stevia. Pregnant and breastfeeding women can use stevia within ADI limits as a sweetener; safety is supported by regulatory reviews. Whole leaf stevia or crude extracts (vs. high-purity steviol glycosides) have less safety data. People sensitive to particular bitter compounds may not tolerate stevia.

Interactions

Stevia has minimal known drug interactions. Some animal studies suggest possible mild blood pressure-lowering and blood glucose-lowering effects, which could theoretically add to antihypertensive or antidiabetic medications, though clinical relevance at typical sweetener doses appears small.

Frequently asked questions

Is stevia safe to consume daily?⌄

Yes, high-purity stevia (95 percent or greater steviol glycosides) is recognized as safe by major regulatory bodies. The acceptable daily intake is generous (4 mg/kg body weight of steviol equivalents); typical use is well below this.

Does stevia raise blood sugar?⌄

No. Stevia does not affect blood glucose or insulin levels. It is widely used by people with diabetes as a sugar substitute.

Why does some stevia taste bitter?⌄

Stevioside has a bitter aftertaste that some people detect strongly. Modern products often use higher proportions of rebaudioside A or rebaudioside M, which have cleaner sweet profiles.

Is whole-leaf stevia safer than extract?⌄

Refined steviol glycosides have been extensively studied and approved as safe. Whole-leaf stevia and crude extracts are less standardized and not FDA-approved as sweeteners in the US, though they are commonly used in herbal preparations.

Can stevia cause allergic reactions?⌄

Rarely. People with allergies to plants in the Asteraceae family (ragweed, daisies) may be more likely to react. Most people tolerate stevia without issue.

References

  • Stevia (Wikidata) — Wikidata link
  • Stevia (ChEBI) — ChEBI link

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Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition.