The material selection platform
Cosmetics Ingredients
The material selection platform
Cosmetics Ingredients


CAS Number 65-85-0
Chem/IUPAC Name: Benzoic acid
EINECS/ELINCS No: 200-618-2
COSING REF No: 32134
Benzoic Acid is a naturally occurring and synthetically produced compound used in cosmetics for its preservative properties. It is commonly found in a variety of personal care and cosmetic products, such as skincare, shampoos, and makeup. Benzoic Acid acts as an antimicrobial agent, preventing the growth of bacteria and fungi, which helps extend the shelf life of these products and maintains their safety and quality. While generally safe for topical use, it is crucial for manufacturers to adhere to regulatory guidelines to ensure its appropriate concentration to avoid any potential skin irritation or sensitization. The chemical formula of Benzoic Acid is C6H5COOH.

What is BENZOIC ACID used for?

Benzoic Acid is quite a useful ingredient, working to improve the shelf life of personal care and cosmetic products, and preventing them from going bad.
  • Skin care: It is used in skincare products for its preservative properties, ensuring the safety and longevity of creams, lotions, and serums. It prevents the growth of harmful microorganisms, enhancing the shelf life of these products and maintaining their quality. Further, Benzoic Acid is also moisturizing for the skin and offers certain anti-aging benefits
  • Hair care: It is employed as a preservative in shampoos, conditioners, and hair styling products. It helps inhibit the growth of bacteria and fungi that could spoil these products, guaranteeing their effectiveness and safety for users
  • Cosmetic products: It plays a vital role in cosmetics, particularly in makeup items like foundations, lipsticks, and eyeshadows. This preservative safeguards the integrity and hygienic condition of these products, ensuring they remain free from contamination and suitable for application. It also stabilizes the formulations that it is added to


Benzoic Acid is typically synthesized through the oxidation of toluene, a hydrocarbon obtained from petroleum. The process involves multiple chemical reactions, including air oxidation, which converts toluene into benzoic acid. It is then purified and refined for use in various industries, including cosmetics.

What does BENZOIC ACID do in a formulation?

  • Preservative

Safety profile

Benzoic Acid is considered safe for use in cosmetics when applied topically in the recommended concentrations. Its vegan status may vary depending on the source, as it can be synthetically produced or derived from natural sources. It is advisable to check product labels or consult with manufacturers for vegan-specific information.

Technical profile

Property Values
Boiling Point 249.2°C
Melting Point 122.3°C
pH 4.1
Solubility Poorly soluble in water
Viscosity 1.26 mPa
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