# Steviol

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/steviol
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-19
**Evidence Score:** 2 / 10
**Category:** Compound
**Also Known As:** ent-kaur-16-en-18-oic acid, steviol aglycone, kaʼa heʼê, sweet herb of Paraguay, honey leaf, sugar leaf, caa-ehe

## Overview

Steviol is a diterpenoid aglycone and the core metabolic product of steviol glycosides, including stevioside and rebaudioside A, derived from Stevia rebaudiana. It exerts biological effects primarily by modulating cAMP signaling, inhibiting key DNA enzymes, and interacting with bitter taste receptors (TAS2Rs) and TRPA1 channels.

## Health Benefits

• May support healthy [blood pressure](/ingredients/condition/heart-health) levels - meta-analysis found stevioside (not rebaudioside A) reduced systolic BP, though effects were small with high heterogeneity (PMID: 25412840)
• Potential anti-cancer properties - in-vitro studies show steviol inhibits DNA polymerases/topoisomerase II and triggers apoptosis in colon/breast/GI cancer cells (preliminary evidence)
• [Anti-inflammatory](/ingredients/condition/inflammation) effects - steviol inhibits NF-κB, TNF-α/IL-1β in LPS-stimulated monocytes and downregulates liver inflammation genes (preliminary evidence)
• Enhanced glucose uptake - increases PI3K/Akt phosphorylation and GLUT translocation in muscle cells, mimicking insulin action (preliminary evidence)
• Weight maintenance support - daily stevia consumption in healthy adults showed no glycemic impact but aided weight maintenance (limited clinical evidence)

## Mechanism of Action

Steviol and its glycoside stevioside activate cAMP-mediated signaling pathways, enhancing insulin secretion from pancreatic beta cells in a glucose-dependent manner, which contributes to its antidiabetic potential. Steviol directly inhibits DNA polymerases alpha/beta and topoisomerase II, disrupting cancer cell replication in in-vitro models. Additionally, steviol interacts with bitter taste receptors (TAS2Rs) and TRPA1 channels in enteroendocrine cells, potentially influencing GLP-1 secretion and downstream glycemic regulation.

## Clinical Summary

A 2014 meta-analysis (PMID: 25412840) of multiple RCTs found stevioside supplementation reduced systolic [blood pressure](/ingredients/condition/heart-health) modestly, though effect sizes were small and heterogeneity was high, limiting conclusions; rebaudioside A showed no significant effect. Human trials using doses of 750–1500 mg/day of stevioside over 1–2 years in hypertensive patients reported modest but statistically significant reductions in systolic and diastolic BP. Anticancer and enzyme-inhibition data remain confined to in-vitro and animal models, with no confirmed human clinical trials establishing efficacy. Overall, the evidence base is preliminary, and steviol's clinical profile is largely inferred from stevioside pharmacology since steviol itself is a gut-generated metabolite not typically administered directly.

## Nutritional Profile

Steviol is the core aglycone diterpene compound derived from the metabolic breakdown of steviol glycosides (e.g., stevioside, rebaudioside A) found in Stevia rebaudiana. It is not consumed directly as a food ingredient but is the primary active metabolite after intestinal hydrolysis of steviol glycosides by gut microbiota.

**Macronutrients:** Negligible caloric value; no meaningful contribution of carbohydrates, fats, or proteins at physiologically relevant doses. Caloric contribution is effectively zero.

**Micronutrients:** Not a source of vitamins or minerals in functional quantities.

**Bioactive Compounds:**
- Steviol itself (ent-13-hydroxykaur-16-en-18-oic acid): the active diterpene aglycone; present at trace systemic concentrations following glycoside ingestion.
- Exhibits structural similarity to gibberellins (plant growth hormones), which may underlie some bioactive effects.
- In vitro concentrations used in cancer/[anti-inflammatory](/ingredients/condition/inflammation) studies typically range from 10–200 µM, which may not be physiologically achievable through dietary intake alone.

**Bioavailability Notes:**
- Steviol glycosides are poorly absorbed intact in the small intestine; colonic bacteria (e.g., Bacteroides, Clostridium) cleave glycosidic bonds to release steviol.
- Steviol is absorbed in the colon, conjugated to steviol glucuronide in the liver, and excreted renally.
- Systemic plasma concentrations of steviol after typical steviol glycoside intake are low (nanomolar to low micromolar range), limiting translation of high-dose in vitro findings to in vivo efficacy.
- No dietary reference intake or established safe upper limit exists for pure steviol as an isolated compound.

## Dosage & Preparation

Clinically studied doses include 250 mg stevioside three times daily for 3 months. The acceptable daily intake (ADI) for steviol glycosides is 4 mg/kg body weight as steviol equivalents. No direct steviol dosing has been established in human trials. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Steviol glycosides are generally recognized as safe (GRAS) by the FDA at acceptable daily intakes of up to 4 mg/kg body weight (as steviol equivalents), but steviol itself as an isolated compound has a less established direct safety profile. Because stevioside can lower [blood pressure](/ingredients/condition/heart-health) and enhance insulin secretion, concurrent use with antihypertensives or antidiabetic drugs (e.g., metformin, sulfonylureas) may produce additive hypotensive or hypoglycemic effects requiring dose monitoring. Steviol has shown genotoxic potential in some in-vitro bacterial assay models (Ames test), though this has not been replicated in mammalian systems at physiological doses. Pregnant and breastfeeding women are advised to limit intake, as reproductive safety data for isolated steviol specifically remain insufficient.

## Scientific Research

A 2019 systematic review and meta-analysis of 9 RCTs (n=462) found no significant effects of steviol glycosides on fasting blood glucose or insulin levels (PMID: 31438580). Another meta-analysis showed stevioside may reduce systolic BP with small effects (PMID: 25412840), while a 2024 meta-analysis confirmed no effect on [glucose metabolism](/ingredients/condition/weight-management) (PMID: 38512280).

## Historical & Cultural Context

Stevia rebaudiana leaves have been used for centuries in Guarani traditional medicine in Paraguay and South America as a sweetener and for hypoglycemic effects in type 2 diabetes. Historical use dates to pre-Columbian times and continues in modern herbal practices.

## Synergistic Combinations

Chromium picolinate, alpha-lipoic acid, cinnamon extract, gymnema sylvestre, bitter melon extract

## Frequently Asked Questions

### What is the difference between steviol and stevioside?

Stevioside is a steviol glycoside found in the Stevia rebaudiana leaf, consisting of steviol bound to glucose molecules, which gives it its intense sweetness roughly 250–300 times that of sucrose. When ingested, gut bacteria cleave those glucose units, releasing steviol as the primary aglycone metabolite that is then absorbed and exerts most of the observed biological effects. Steviol itself is not sweet and is not typically consumed directly as a supplement.

### Can steviol help lower blood sugar levels?

Steviol and its parent compound stevioside stimulate insulin secretion from pancreatic beta cells via a cAMP-dependent mechanism, but this effect is glucose-dependent, meaning it is significantly blunted at low blood glucose concentrations, reducing hypoglycemia risk. Human RCTs using stevioside at 750–1500 mg/day have shown modest improvements in postprandial glucose and HbA1c in type 2 diabetic patients. However, evidence is not yet strong enough to recommend steviol as a standalone antidiabetic therapy, and it should not replace prescribed medications.

### Does steviol have anticancer properties?

In-vitro studies demonstrate that steviol can inhibit DNA polymerases alpha and beta as well as topoisomerase II, enzymes essential for cancer cell DNA replication and repair, at micromolar concentrations. Some cell culture studies also show steviol induces apoptosis in certain tumor cell lines. However, no human clinical trials have tested steviol as an anticancer agent, so these findings cannot yet be translated into therapeutic recommendations.

### Is steviol safe to consume daily?

The European Food Safety Authority (EFSA) and Joint FAO/WHO Expert Committee on Food Additives (JECFA) have set an acceptable daily intake (ADI) of 4 mg/kg body weight per day expressed as steviol equivalents, a level consistently achievable within normal dietary use of stevia-sweetened products. In-vitro genotoxicity signals observed in some bacterial Ames test studies have not been confirmed in mammalian or human studies at these intake levels. Individuals on antihypertensive or antidiabetic medications should consult a physician due to potential additive pharmacodynamic effects.

### How much stevioside is needed to reduce blood pressure?

The clinical trials included in the 2014 meta-analysis (PMID: 25412840) primarily used stevioside doses of 750 mg to 1500 mg per day, divided across meals, over periods ranging from several weeks to two years in patients with mild-to-moderate hypertension. The observed reductions in systolic blood pressure were statistically significant but modest in absolute terms, generally in the range of 5–10 mmHg, with high heterogeneity across studies. Importantly, rebaudioside A showed no significant blood pressure effect in the same analysis, suggesting the effect is specific to stevioside and possibly its steviol metabolite.

### Is steviol safe to take with blood pressure medications?

Steviol and its glycosides may have additive blood pressure-lowering effects, so concurrent use with antihypertensive medications should be monitored by a healthcare provider. While steviol itself has not shown major drug interactions in clinical studies, combining it with BP-lowering drugs could theoretically increase the risk of hypotension. Always consult your doctor before combining steviol supplements with prescription cardiovascular medications.

### What is the difference between steviol and the stevioside form found in stevia leaf extract?

Steviol is the base aglycone compound, while stevioside is steviol bound to glucose molecules (a glycoside form). Stevioside is the primary sweet-tasting compound in stevia leaf and is what has shown blood pressure-reducing effects in meta-analyses, whereas free steviol itself is produced when stevioside is metabolized in the digestive tract. Most stevia supplements and food additives contain stevioside rather than isolated steviol.

### Does steviol have better anti-inflammatory effects than other stevia compounds?

Limited direct comparative research exists, but in-vitro studies suggest steviol exhibits anti-inflammatory activity through inhibition of inflammatory pathways. Most clinical evidence for stevia's anti-inflammatory benefits comes from stevioside rather than isolated steviol, making it difficult to establish whether steviol is superior. More human studies are needed to determine which stevia-derived compound offers the most potent anti-inflammatory effects.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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