Quick Summary

Stevia rebaudiana is a natural, zero-calorie sweetener widely used as a sugar substitute. Its main bioactive compounds are steviol glycosides, which have demonstrated diverse pharmacological activities including antioxidant, anti-inflammatory, antidiabetic, antihypertensive, and antimicrobial effects in preclinical studies. Fermentation of stevia extracts may enhance bioavailability and biological activities. Stevia has a long history of traditional use and is generally recognized as safe by food regulatory authorities up to identified acceptable intake levels.

What is it?

Stevia is a plant species native to South America, known primarily for its leaves that contain sweet-tasting compounds called steviol glycosides. These compounds provide sweetness without calories, making stevia a popular natural alternative to sugar in food and beverage products.

Traditional Uses

Traditionally, stevia leaves have been used by indigenous populations in Paraguay and Brazil to sweeten beverages and as a folk remedy for various ailments. Its use as a non-nutritive sweetener has evolved into widespread culinary and commercial applications.

Active Compounds

The key active components of stevia are steviol glycosides, including stevioside and rebaudioside A. These compounds are responsible for stevia’s sweetness and its observed biological activities in laboratory and animal studies.

Potential Benefits with Evidence Levels

  • Anti-hyperglycemic/Antidiabetic (Moderate clinical and strong preclinical evidence): Multiple systematic reviews and meta-analyses indicate that stevia and its glycosides may help regulate blood glucose and improve insulin sensitivity. Some randomized controlled trials (RCTs) report reductions in postprandial blood sugar and diabetic biomarkers, though clinical data remain partly inconclusive and further research is needed.
  • Antioxidant and Anti-inflammatory (Preclinical evidence): In vitro and animal studies demonstrate antioxidant and anti-inflammatory properties of stevia extracts. Fermented stevia extracts may exhibit enhanced antioxidant effects and beneficial modulation of gut microbiota.
  • Cardioprotective (Blood Pressure Reduction) (Moderate clinical evidence): Some clinical trials suggest stevia consumption may reduce systolic and diastolic blood pressure in individuals with hypertension or chronic kidney disease.
  • Antimicrobial Effects (In vitro and preclinical evidence): Stevia extracts have shown antibacterial activity in laboratory settings, including effects against certain pathogens relevant to oral health and parasitic infections.
  • Oral Health (Limited clinical evidence): Herbal oral care products containing stevia may aid in improving periodontal disease outcomes and preventing dental caries, though evidence quality varies and more high-quality clinical trials are necessary.
  • Gut Microbiota Modulation (Preclinical evidence): Fermented stevia extracts may beneficially alter gut microbiota composition and reduce inflammatory markers associated with dysbiosis.

Side Effects

Stevia is generally well tolerated at typical intake levels. Reported adverse effects are mostly mild and may include gastrointestinal symptoms. Some animal studies suggest potential immunological and reproductive effects with high or prolonged doses, but consistent severe adverse effects in humans at recommended doses have not been established. Long-term safety data in humans are limited.

Drug Interactions

No specific clinical evidence currently identifies direct drug interactions with stevia. However, due to its potential effects on glucose metabolism and blood pressure, caution is advised when stevia is used alongside antidiabetic or antihypertensive medications until further research clarifies interaction risks.

Who Should Avoid It

No specific contraindications have been clearly identified. Nonetheless, cautious use is advisable for individuals with certain health conditions due to limited evidence and to minimize potential risks. Pregnant and breastfeeding women should use stevia only if benefits outweigh risks and under medical supervision, as safety data in these populations are limited.

Evidence Limitations

  • Most clinical studies are small, short-duration, and have methodological limitations or heterogeneity.
  • There is a lack of long-term randomized controlled trials assessing safety and efficacy in diverse populations.
  • Majority of pharmacological evidence comes from in vitro or animal studies; human effects require further confirmation.
  • Variations in stevia formulations, dosages, and types (e.g., fermented vs. unfermented) complicate direct comparisons.
  • Standardization of production and mechanisms of action need more comprehensive research.

References

  • Ma Q, Dawa Y, Zhang J. (2026). Revolutionizing sweetness: the multifaceted health benefits of fermented stevia. Applied Microbiology and Biotechnology. doi: 10.1007/s00253-026-13802-4. PMID: 41876882.
  • Peng Z, Zhan S, Yang X, Huang S, Huang H, Wang W. (2026). The progress on stevia (Stevia rebaudiana Bertoni): chemical composition, pharmacokinetics, pharmacological effects, safety, applications, and biosynthesis. Frontiers in Nutrition. doi: 10.3389/fnut.2026.1728578. PMID: 41777858.
  • Rizwan F et al. (2025). Effect of Stevia on Inflammatory Markers, Renal and Hematological Parameters in Patients With Stage I-III Chronic Kidney Disease: A Randomized, Placebo-Controlled Clinical Trial in Bangladesh. Cureus. doi: 10.7759/cureus.88152. PMID: 40821154.
  • Chowdhury AI et al. (2022). Effect of stevia leaves (Stevia rebaudiana Bertoni) on diabetes: A systematic review and meta-analysis of preclinical studies. Food Science & Nutrition. doi: 10.1002/fsn3.2904. PMID: 36171777.
  • Raghavan G et al. (2023). Effect of Sugar Replacement with Stevia-Based Tabletop Sweetener on Weight and Cardiometabolic Health among Indian Adults. Nutrients. doi: 10.3390/nu15071744. PMID: 37049584.
  • Bundgaard Anker CC et al. (2019). Effect of Steviol Glycosides on Human Health with Emphasis on Type 2 Diabetic Biomarkers: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Nutrients. doi: 10.3390/nu11091965. PMID: 31438580.
  • Lohner S et al. (2020). Non-nutritive sweeteners for diabetes mellitus. Cochrane Database of Systematic Reviews. doi: 10.1002/14651858.cd012885.pub2. PMID: 32449201.
  • Feng J et al. (2020). Evaluation of Natural and Botanical Medicines for Activity Against Growing and Non-growing Forms of B. burgdorferi. Frontiers in Medicine. doi: 10.3389/fmed.2020.00006. PMID: 32154254.
  • Chatzopoulos GS et al. (2022). Clinical Effectiveness of Herbal Oral Care Products in Periodontitis Patients: A Systematic Review. International Journal of Environmental Research and Public Health. doi: 10.3390/ijerph191610061. PMID: 36011693.
  • Alam S et al. (2022). Antidiabetic Phytochemicals From Medicinal Plants: Prospective Candidates for New Drug Discovery and Development. Frontiers in Endocrinology. doi: 10.3389/fendo.2022.800714. PMID: 35282429.

Last Reviewed

June 2024

Disclaimer: This information is provided for educational purposes only and is not intended as medical advice. It is important to consult a healthcare professional before using stevia or any herbal supplement, especially if you have underlying health conditions or are taking medications.