# Carnosol

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/carnosol
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-19
**Evidence Score:** 4 / 10
**Category:** Compound
**Also Known As:** C20H26O4, Rosmarinus officinalis diterpene, Sage phenolic compound, Carnosolic acid precursor, Lamiaceae antioxidant, Rosemary extract compound

## Overview

Carnosol is a phenolic diterpenoid compound found primarily in rosemary that exhibits potent antioxidant and anti-inflammatory properties. It functions by scavenging [reactive oxygen species](/ingredients/condition/antioxidant) and suppressing the NF-κB [inflammatory pathway](/ingredients/condition/inflammation).

## Health Benefits

• Antioxidant activity: Scavenges [reactive oxygen species](/ingredients/condition/antioxidant) and protects lipids from peroxidation (preliminary evidence from in vitro studies)
• Anti-inflammatory effects: Suppresses NF-κB [inflammatory pathway](/ingredients/condition/inflammation) (preliminary evidence from in vitro studies, PMID 17047462)
• Anti-cancer potential: Demonstrates cytotoxicity in breast cancer MCF-7 cells with IC50 ~82 μM and induces cell cycle arrest (preliminary evidence from cell line studies only)
• [Antimicrobial](/ingredients/condition/immune-support) activity: Shows efficacy against Mycobacterium tuberculosis with MIC 157 μM (preliminary evidence from in vitro studies)
• Cellular protection: Modulates [glutathione](/ingredients/condition/detox) levels and protects against oxidative stress in chloroplasts (preliminary evidence from plant and in vitro studies)

## Mechanism of Action

Carnosol exerts its effects primarily through suppression of the nuclear factor-κB (NF-κB) signaling pathway, reducing [inflammatory](/ingredients/condition/inflammation) cytokine production. It scavenges [reactive oxygen species](/ingredients/condition/antioxidant) including hydroxyl radicals and superoxide anions, protecting cellular lipids from peroxidation. The compound also modulates various enzymes involved in oxidative [stress response](/ingredients/condition/stress)s and inflammatory cascades.

## Clinical Summary

Current evidence for carnosol consists primarily of in vitro laboratory studies and animal research, with limited human clinical data available. Laboratory studies have demonstrated significant [antioxidant activity](/ingredients/condition/antioxidant) and [NF-κB](/ingredients/condition/inflammation) pathway suppression at concentrations ranging from 10-50 μM. Animal studies suggest potential anti-cancer effects, but sample sizes are typically small (n=8-20 per group). Human clinical trials are needed to establish therapeutic efficacy and optimal dosing protocols.

## Nutritional Profile

Carnosol (C20H26O4, MW 330.42 g/mol) is a phenolic diterpene lactone, not a nutritional macronutrient source. It is a bioactive secondary metabolite found primarily in rosemary (Rosmarinus officinalis) and sage (Salvia officinalis). Key details: • Concentration in rosemary leaf: approximately 0.02–0.4% dry weight (~0.2–4 mg/g dried herb), varying by cultivar, harvest time, and extraction method. • Concentration in sage leaf: approximately 0.01–0.2% dry weight. • Biosynthetically derived from carnosic acid via oxidative lactonization; carnosic acid (its precursor) is typically present at higher concentrations (~1.5–2.5% dry weight in rosemary) and readily converts to carnosol during drying, heating, or extraction. • Lipophilic compound (LogP ~3.6), soluble in ethanol, DMSO, and lipid matrices; poorly soluble in water (<0.1 mg/mL). • Bioavailability notes: Oral bioavailability is considered low due to poor aqueous solubility and significant first-pass hepatic [metabolism](/ingredients/condition/weight-management); absorption is enhanced when consumed with dietary fats or lipid-based delivery systems. In vitro studies suggest phase I (CYP450-mediated hydroxylation) and phase II (glucuronidation, sulfation) metabolism. Plasma concentrations in animal models after oral dosing (~30–90 mg/kg) reach low micromolar levels (~1–5 μM), suggesting limited but measurable systemic availability. • No macronutrient value (no significant protein, carbohydrate, fat, or fiber contribution at typical dietary exposure levels). • No vitamin or mineral content inherent to the compound itself. • Co-occurring bioactive compounds in rosemary extract (typical context of dietary exposure): carnosic acid (~15–25 mg/g extract), rosmarinic acid (~10–50 mg/g extract), ursolic acid (~2–10 mg/g extract), and smaller amounts of rosmanol, epirosmanol, and methyl carnosate. • Typical dietary intake from culinary rosemary use: estimated at <5 mg/day carnosol from ~1–2 g dried rosemary; concentrated rosemary extracts (standardized supplements) may deliver 10–50 mg carnosol per dose. • EFSA-approved rosemary extracts (E392) used as food [antioxidant](/ingredients/condition/antioxidant) additives contain carnosol + carnosic acid combined at standardized levels (typically ≥10% w/w combined diterpenes).

## Dosage & Preparation

No clinically studied dosages exist for isolated carnosol due to absence of human trials. In vitro studies used concentrations of 28-157 μM (9-52 μg/mL). Rosemary extracts standardized to 5-10% total diterpenes (carnosol plus carnosic acid) are typically dosed at 100-500 mg/day in general [antioxidant](/ingredients/condition/antioxidant) studies. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Carnosol appears generally well-tolerated when consumed through dietary sources like rosemary, with no significant adverse effects reported in animal studies. However, concentrated supplement forms lack comprehensive safety data, particularly regarding long-term use and potential drug interactions. The compound may theoretically interact with medications metabolized by cytochrome P450 enzymes, though specific interactions have not been documented. Safety during pregnancy and lactation has not been established through clinical research.

## Scientific Research

No human clinical trials, randomized controlled trials, or meta-analyses have been conducted on isolated carnosol. Current evidence is limited to in vitro cell line studies and animal research, with human data available only indirectly through rosemary extract studies containing multiple compounds.

## Historical & Cultural Context

While carnosol itself was not isolated in traditional medicine, its source plants rosemary and sage have been used for millennia in Mediterranean herbalism dating back to Dioscorides (1st century AD). These herbs were traditionally employed for digestive issues, meat preservation, circulation enhancement, and as antiseptics in Greek, Roman, and European folk medicine.

## Synergistic Combinations

Carnosic acid, rosmarinic acid, ursolic acid, vitamin E, quercetin

## Frequently Asked Questions

### What foods contain carnosol naturally?

Carnosol is found primarily in rosemary (Rosmarinus officinalis) and sage (Salvia officinalis), with rosemary containing the highest concentrations at approximately 1.5-2.5% by dry weight. Fresh rosemary typically provides 15-25 mg of carnosol per gram of dried herb.

### How much carnosol should I take daily?

No standardized dosage has been established for carnosol supplements due to limited human clinical trials. Most research uses concentrations of 10-50 μM in laboratory settings, but translating this to human dosing requires further study.

### Can carnosol help prevent cancer?

Preliminary laboratory and animal studies suggest carnosol may have anti-cancer properties through multiple pathways including apoptosis induction and cell cycle arrest. However, human clinical trials are needed to determine actual cancer prevention benefits in people.

### Does carnosol have any side effects?

Current research shows no significant adverse effects from carnosol in animal studies at typical research doses. However, comprehensive safety data for concentrated supplements in humans is limited, particularly for long-term use.

### How does carnosol compare to other antioxidants?

Carnosol demonstrates superior antioxidant activity compared to vitamin E in some laboratory tests, particularly for protecting lipids from oxidation. Its unique ability to suppress NF-κB inflammatory pathways distinguishes it from simpler antioxidants like vitamin C.

### What is the quality of clinical evidence supporting carnosol's health benefits?

Most evidence for carnosol comes from in vitro (laboratory cell) studies, which show promise for antioxidant and anti-inflammatory effects but have limited direct applicability to human health. While preliminary research demonstrates carnosol can suppress inflammatory pathways like NF-κB and induce cell cycle arrest in cancer cell lines, human clinical trials are largely absent. This means claims about carnosol's effectiveness in people remain unproven and require further investigation through controlled studies.

### Is carnosol safe to use alongside prescription medications?

Limited research exists on carnosol's interactions with medications, making it difficult to provide comprehensive safety guidance. Because carnosol may have anticoagulant or anti-inflammatory properties based on preliminary evidence, individuals taking blood thinners or anti-inflammatory drugs should consult a healthcare provider before supplementing. Until more interaction studies are completed, caution is warranted when combining carnosol with prescription treatments.

### Who would be most likely to benefit from carnosol supplementation?

Currently, no specific population has been established to benefit from carnosol supplementation due to the lack of human clinical trials. Theoretically, individuals interested in antioxidant and anti-inflammatory support might consider it, but efficacy in humans remains undemonstrated. Those with inflammatory conditions or cancer concerns should discuss carnosol with their healthcare provider rather than relying on preliminary laboratory evidence.

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