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Rosemary extract is derived from the leaves of the rosemary plant, Rosmarinus officinalis, an herb used for centuries in traditional medicine. The extract is rich in antioxidants and other beneficial compounds and is used in the food industry for preservation, colour protection, oil stabilisation and meat flavour stabilisation. It is valued as a natural, efficient and heat-resistant antioxidant, and its anti-inflammatory, anti-tumour, cardioprotective and hepatoprotective properties have attracted sustained research interest.
For product developers, the key technical questions are not simply whether rosemary extract retards oxidation, but how its phenolic profile varies between aqueous and organic-solvent extracts, how it performs in lipid versus aqueous systems, at what dose it remains effective and compliant, and how it should be distinguished from rosemary essential oil. This guide consolidates those considerations into a practical B2B formulation framework.
| Function | Suitable Users | Core Technical Indicators | Compliance Framework |
|---|---|---|---|
| Natural antioxidant | Developers of oils, fats, fried products and meat items who want to replace or reduce synthetic antioxidants such as BHT and BHA | CAS 84604-14-8; phenolic diterpenes carnosic acid and carnosol plus rosmarinic acid; carnosic acid capacity several times that of BHT and BHA but less than TBHQ | Generally regarded as safe by the US FDA; authorised as food additive E 392 in the EU when prepared with a food-approved solvent |
| Shelf-life enhancer | Producers of perishable meat, poultry, fish and dairy products that are susceptible to microbial spoilage and oxidative deterioration | Inhibits growth of Staphylococcus aureus, Escherichia coli, Salmonella enterica and Pseudomonas aeruginosa; inhibits essential enzyme activities and interferes with bacterial DNA replication | Category-specific maximum permitted levels apply; verify against the current additive schedule for each food category |
| Flavouring agent | Developers of marinades, dressings, sauces and rubs seeking a savoury herbal note in meat, poultry, fish and vegetable products | Distinct aromatic, piney and slightly minty flavour; FEMA number 2992; sensory described as aromatic and pungent with a pine-woody aroma and fresh, bittersweet taste | Declared as a flavouring where used for taste rather than for antioxidant function |
| Heat-resistant active | Formulators of fried and baked applications where the antioxidant must survive thermal processing rather than degrade early | Best antioxidant effect demonstrated below 130 °C; typical dosage 0.01–0.5% or more depending on application and intended effect | Confirm the extract grade and standardisation level match the intended thermal process and food category |
Rosemary extract is obtained from the leaves of Rosmarinus officinalis. Its antioxidant activity depends on its phenolic composition, and rosemary contains three principal actives: carnosic acid, rosmarinic acid and carnosol. Typical content ranges are rosmarinic acid at 0.27 to 2.49%, carnosic acid at 0.01 to 1.77%, and carnosol at 0.17 to 0.94%. The levels of these polyphenolic compounds can decrease rapidly with age as they are diluted during leaf growth, so the potency of a botanical raw material is not constant across harvests.
That variability is the defining practical characteristic of rosemary extract as an ingredient. Because it is a mixture rather than a single molecule, its functional performance tracks the ratio of its actives, and that ratio depends on the plant material and the extraction route. A buyer who specifies only "rosemary extract" has specified very little; the standardisation basis and phenolic profile are the parameters that determine whether the material will deliver the intended protection.
Explore the rosemary extract technical encyclopedia for additional chemical and application information.
| Parameter | Specification / Description |
|---|---|
| Chemical name | Rosemary extract (Rosmarinus officinalis) |
| CAS Number | 84604-14-8 |
| EC / ELINCS number | 283-291-9 |
| E number (food additive) | E 392 |
| INS number | INS 392 |
| FEMA number | 2992 |
| Appearance | Colorless to yellow to brown liquid, or powder depending on grade |
Rosemary extract is not used for a textural or processing function such as emulsification. Its value is primarily oxidative and antimicrobial protection, and understanding the chemistry of lipid oxidation explains why the extract is effective and why its dose and grade matter.
When exposed to oxygen, light and heat, oils can undergo oxidation, forming free radicals and breaking the oil's chemical structure. Lipid oxidation typically proceeds through three stages, initiation, propagation and termination. In the initiation stage highly reactive free radicals are formed, which can start a chain reaction until it is terminated, and the process leads to rancidity, off-flavours and a decrease in nutritional value. Rosemary extract contains natural antioxidants that scavenge free radicals and inhibit lipid oxidation. These antioxidants donate hydrogen atoms or electrons to the free radicals, neutralising their reactivity and preventing further oxidation.
Rosemary extract also contains caffeic acid derivatives. These compounds react with present metal ions to form chelates, which subsequently react with peroxide radicals and stabilise them. Structurally, carnosic acid is a phenolic diterpene carrying two phenolic hydroxyl groups and a carboxyl group, and the presence of a catechol group in the aromatic ring at positions C11–C12 of the rosemary phenolic diterpene skeleton is probably the most important structural element for antioxidant activity. Carnosic acid has high reactivity toward reactive oxygen species and is easily oxidised, and its antioxidant activity likely relies on chemical quenching of those species.
Rosemary plants are rich sources of phenolic compounds with high antimicrobial activity against both Gram-positive and Gram-negative bacteria, and rosemary leaf extract can be used as a potential antimicrobial of natural origin in foods. The monoterpenes and phenols in rosemary possess noticeable antimicrobial, antifungal and antiviral activity. Studies show that rosemary extract can inhibit the growth of various pathogenic bacteria, including Staphylococcus aureus, Escherichia coli, Salmonella enterica and Pseudomonas aeruginosa, and it is understood to exert its antimicrobial effects by inhibiting essential enzyme activities and interfering with bacterial DNA replication.
Manufacturers produce rosemary extract using organic solvents such as acetone, ethanol and hexane-ethanol, and aqueous rosemary extracts are also available, although their phenolic composition differs from that of organic-solvent extracts. Supercritical fluid extraction is also used to recover the actives, but the organic solvent method remains the most common. Various pre-treatments and extraction conditions can be employed, including ultrasonic-assisted extraction, microwave-assisted extraction, stirring extraction and heat reflux.
The factors that affect the active-component profile include the solvent used, the material-to-liquid ratio, extraction time, extraction temperature and drying temperature, and the solvent's polarity, solvency and boiling point also have a major impact. One illustrative method dries rosemary leaves at 45 °C until the moisture content reaches 12%, extracts the leaves with ethanol using the maceration method, and dries the filtered extract under vacuum. After extraction, the filtrate can be subjected to decolorisation and deodorisation if necessary.
It is important to note that rosemary extract differs from rosemary essential oil, which is produced using steam distillation or hydro-distillation techniques. The two are frequently confused in casual usage, but they are chemically different products with different compositions and different marketplace positioning.
From a formulation perspective, the most relevant distinction is not between rosemary and unrelated botanicals but between the different extract types derived from the same plant. The categories that matter are the aqueous and organic-solvent extracts, and the separate class of rosemary essential oil.
Polyphenols and flavonoids in rosemary extract exert antioxidant activity. Carnosic acid and carnosol are two important active components found in plants of the Lamiaceae family, and both phenolic diterpenes exhibit antioxidant, anticancer, anti-inflammatory and neuroprotective activities. Rosmarinic acid is the third major active, and in this molecule two catechol structures conjugated with a carboxylic acid group increase the antioxidant activity.
The polyphenolic components in rosemary can be extracted using aqueous or solvent extraction, and the resulting profiles differ sharply. In lipid systems, extracts with higher phenolic diterpene content are more effective, while in aqueous systems rosmarinic acid exhibits the highest antioxidant activity. This is why a single extract type cannot be optimal across all applications, and why the choice of extract is a function of the matrix.
Rosemary essential oil is a colourless or pale-yellow volatile liquid extracted from the branches and leaves, with a characteristic odour. It consists mainly of monoterpenes such as 1,8-cineole, camphor and alpha-pinene, and its antioxidant activity is majorly due to oxygenated monoterpenes, specifically alpha-terpineol and cis-sabinene hydrate. Essential oil fractions can be used as natural antioxidants for vegetable oils, increasing shelf life, improving stability and preventing loss of sensory and nutritional qualities.
| Parameter | Solvent Extract | Aqueous Extract |
|---|---|---|
| Rosmarinic acid | 0.61 ± 0.01 | 8.46 ± 0.06 |
| Isoscutellarein 7-O-glucoside | 0.01 ± 0.00 | 4.46 ± 0.04 |
| Genkwanin | 1.50 ± 0.02 | 0.13 ± 0.01 |
| Carnosol | 13.14 ± 0.09 | 0.07 ± 0.00 |
| Carnosic acid | 28.30 ± 0.11 | 0.15 ± 0.01 |
| 12-Methylcarnosic acid | 0.59 ± 0.01 | 0.01 ± 0.00 |
| Property | Typical Description |
|---|---|
| Physical form | Liquid or powder |
| Appearance | Colorless to yellow to brown liquid |
| pH | 4.5–5.5 |
| Specific gravity at 20 °C | 0.8940–0.9240 |
| Solubility | Oil- and water-soluble extracts can be obtained separately |
| Storage | Air- and waterproof glass or plastic resin containers at ambient temperature, ideally 2–8 °C |
| Descriptive claims | Natural, halal, kosher, organic, GMO-free, plant-based, on a product-specific basis |
| Function | Typical Applications | Key Formulation Objective |
|---|---|---|
| Antioxidant | Used in food to prevent or slow the oxidation of fats and oils | Extend oxidative stability and protect unsaturated fatty acids through shelf life |
| Shelf-life enhancer | In perishable foods such as meat, poultry, fish and dairy that are susceptible to microbial spoilage | Slow microbial growth and oxidative deterioration while maintaining acceptable sensory attributes |
| Flavouring agent | Marinades, dressings, sauces and rubs that pair with meats, poultry, fish and vegetables | Add a savoury, herbal, piney note without overwhelming the base flavour |
Rosemary extract can be a valuable addition to oil because of its antioxidant, antimicrobial, flavour-enhancing and nutritional properties, helping improve the oil's shelf life, safety, taste and health benefits. In a study, adding rosemary extract to a sunflower and soybean oil mixture reduced the peroxide value by 38% after 30 hours of heating, and the treated oil resisted oxidation and conserved more unsaturated fatty acids. The evolution of saturated fatty acid composition was estimated at 5.5% and 25% in the oil with and without extract respectively at the end of the heating treatment. In another study, adding 0.02% rosemary extract with heat treatment extended the shelf life of chicken meat while maintaining acceptable sensory attributes.
Rosemary extract has also been found to have synergistic effects with other antioxidants, such as vitamin E, for preserving the quality and stability of oils. This combination can provide more effective protection against oxidation and enhance the overall shelf life, and it is a common strategy in vegetable oil formulations.
Start with the system that must be protected. In lipid systems, extracts with higher phenolic diterpene content are more effective; in aqueous systems, rosmarinic acid exhibits the highest antioxidant activity. Choosing an oil-soluble grade for a fat-rich product and a water-soluble grade for an aqueous one is therefore the first decision, and the two forms can be combined when a product contains both phases.
Because the potency of rosemary extract tracks its phenolic profile, confirm how the material is standardised and match the certificate of analysis against the approved purchasing specification. Verify the declared carnosic acid, carnosol and rosmarinic acid content rather than accepting a generic product description, and confirm the extraction solvent is food-approved for the intended market.
Typical dosage runs from 0.01 to 0.5% or more depending on the application and intended effect, and rosemary extract shows its best antioxidant effect below 130 °C. Match the dose and the addition point to the thermal profile of the process so that the active is present and effective at the point of highest oxidative risk.
Because the extract is a variable botanical mixture, performance should be demonstrated in the actual matrix rather than inferred from supplier data. Measure a relevant oxidation marker, such as peroxide value, over the intended shelf life, and assess sensory attributes, because the extract's piney, bittersweet character can become noticeable at higher doses.
The following formulations are illustrative technical examples rather than universal commercial recipes. Actual ingredient levels must be recalculated according to the stability, sensory and regulatory requirements of each project.
| Ingredient | % Composition | Technical Role |
|---|---|---|
| Greek yogurt | 80.39 | Dairy base contributing body and acidity |
| Honey | 6.43 | Sweetener balancing the acidic base |
| Sunflower oil | 9.65 | Oil phase requiring oxidative protection |
| Dijon mustard | 3.22 | Flavour and emulsifying contribution |
| Salt | 0.32 | Seasoning and taste balance |
| Inulin | 5.00 | Functional fibre contributing texture |
| Rosemary extract (water) | 0.015 | Antioxidant and antimicrobial protection in the aqueous phase |
| Rosemary extract (oil) | 0.015 | Antioxidant protection in the oil phase |
This formulation uses rosemary extract for its natural antioxidant and antimicrobial properties, with separate water-soluble and oil-soluble additions so that both phases of the emulsion are protected.
| Ingredient | Composition (g/100 mL) | Technical Role |
|---|---|---|
| Sucrose | 12 | Sweetener and body |
| Citric acid | 0.125 | Acidulant for tartness and pH control |
| Rosemary extract | 1 | Antioxidant, antimicrobial and herbal flavour contribution |
| Sodium benzoate | 0.014 | Preservative protecting the beverage |
| Tricalcium phosphate | 0.1 | Clouding agent and mineral source |
Regulatory treatment of rosemary extract depends on whether it is used as an antioxidant additive or as a flavouring, and the permitted levels vary by food category. A supplier's statement that a material is food grade does not by itself establish compliance in every destination market.
| Market / Framework | Technical Relevance | Compliance Action |
|---|---|---|
| United States — FDA | Rosemary extract is generally regarded as safe under the US FDA listing for essential oils, oleoresins and natural extractives. | Confirm the intended use matches the GRAS basis and that no category-specific restriction applies. |
| European Union — E 392 | Extracts of rosemary (E 392) is an authorised food additive in the EU, to be prepared by extraction of the leaves of Rosmarinus officinalis using a food-approved solvent system, after which extracts may be deodorised, decolorised and standardised. | Confirm the preparation route and that the standardised extract is used within the category-specific maximum permitted level. |
| Category maximum levels | Under the EU schedule, maximum permitted levels vary widely by category, from around 15 mg/kg for some products to 200 mg/kg for many foods and 400 mg/kg for food supplements. | Identify the correct food category and apply the corresponding maximum permitted level before commercialisation. |
| Flavouring status | Where used for taste, rosemary extract is handled under flavouring rules and carries FEMA number 2992. | Declare correctly according to whether the function is antioxidant or flavouring. |
| Source claims | Natural, halal, kosher, organic, GMO-free and plant-based claims are all product-specific and depend on the extraction route and certification. | Obtain certification documentation from the supplier rather than relying on a general product claim. |
Rosemary extract is generally regarded as safe when consumed in moderate quantities. It appears to have low acute toxicity, and the oral lethal dose for male and female rats is greater than 2,000 mg/kg of body weight. Rosemary itself has significant antimicrobial, anti-inflammatory, antioxidant, anti-apoptotic, anti-tumorigenic, antinociceptive and neuroprotective properties, and it shows important clinical effects on mood, learning, memory, pain, anxiety and sleep.
For product developers, the practical safety considerations are dose and claim discipline rather than acute toxicity. The extract should be used within the applicable maximum permitted level for the food category, and any health-related statement should be traceable to a recognised scientific position rather than to the general reputation of the herb. A conventional food product should not be marketed with unsupported claims that imply treatment or prevention of disease.
It depends on the phase that must be protected. In lipid systems, extracts with higher phenolic diterpene content are more effective, while in aqueous systems rosmarinic acid exhibits the highest antioxidant activity. Water-soluble and oil-soluble extracts can be obtained separately, and products containing both phases frequently use a combination of the two.
The antioxidant activity of carnosic acid has an antioxidative capacity several times that of BHT and BHA but less than TBHQ. Its appeal is therefore not raw potency but its natural origin and dual antioxidant and antimicrobial function, which allows formulators to pursue a clean-label preservation strategy where the regulatory and marketing context supports it.
No. Rosemary extract is produced by solvent or supercritical fluid extraction of the leaves and is rich in phenolic diterpenes and rosmarinic acid. Rosemary essential oil is produced by steam distillation or hydro-distillation and consists mainly of volatile monoterpenes such as 1,8-cineole, camphor and alpha-pinene. Their compositions, solubilities and applications differ, so they should not be treated as interchangeable.
Typical dosage runs from 0.01 to 0.5% or more depending on the application and intended effect, and rosemary extract shows its best antioxidant effect below 130 °C. The correct level is best established by measuring an oxidation marker such as peroxide value in the finished product, because the effective dose depends on fatty acid composition, thermal history and the presence of pro-oxidant metals.
| Identifier | Value | Resource |
|---|---|---|
| Chemical name | Rosemary extract (Rosmarinus officinalis) | Technical encyclopedia |
| CAS Number | 84604-14-8 | Chemical dictionary |
| CAS product lookup | 84604-14-8 | Supply search |
| Supplier / trade search | 84604-14-8 | Supplier search |
1. U.S. Food and Drug Administration. Listing of essential oils, oleoresins and natural extractives regarded as safe.
2. European Parliament and Council. Regulation (EC) No 1333/2008 on food additives, entry for extracts of rosemary E 392.
3. American Chemical Society. Studies on the polyphenolic profile of aqueous and solvent rosemary extracts.
4. National Institutes of Health, PubMed Central. Research on rosemary extract and oxidative stability of foods.
5. American Oil Chemists Society. Work on enhancing oxidative stability and shelf life of frying oils with antioxidants.
6. International Society for Nutraceuticals and Functional Foods. Journal of Food Bioactives on frying oils and antioxidants.
7. MDPI Antioxidants. Reviews on carnosic acid, carnosol and rosmarinic acid bioactivity.
8. Codex Alimentarius. General Standard for Food Additives, entry for rosemary extract.
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