Sodium Benzoate
SOH-dee-um BEN-zoh-ate
What Is Sodium Benzoate?
Sodium Benzoate is a widely used preservative derived from benzoic acid, which occurs naturally in berries, plums, and cinnamon. It is one of the oldest and most established preservatives in cosmetics and food. It is most effective in acidic formulations (pH below 5) and is commonly used as a paraben-free preservation option.
Source: Benzoic acid (found naturally in fruits and spices), neutralized with sodium hydroxide
Origin: Semi-synthetic
Also known as: E211, Benzoate of Soda
What Does Sodium Benzoate Do to Your Hair?
Sodium Benzoate inhibits the growth of bacteria, yeast, and mold in cosmetic products by disrupting microbial cellular energy production. It is most effective at acidic pH levels (below 5), which conveniently aligns with the optimal pH for hair care products. It is typically used in combination with potassium sorbate for broad-spectrum protection.
Best For
All hair types (preservative function, not hair-type specific)
Not Recommended For
Not directly problematic for any hair type
Concentration Matters
0.1-1%
Hair Type Compatibility
Method Compatibility
Safety & Regulation
Safe at cosmetic concentrations. When combined with ascorbic acid (Vitamin C) under certain conditions, benzene (a carcinogen) can form, but this is primarily a concern in beverages, not cosmetics. CIR panel considers safe at concentrations up to 5%. Low irritation potential.
FDA Status: Generally Recognized As Safe
FDA classifies as GRAS for food use at up to 0.1%. Permitted in cosmetics up to 2.5% in the EU. CIR panel considers safe at concentrations up to 5% in cosmetics.
EWG Score: 1/10
HairAide Verdict
Sodium Benzoate is a tried-and-true preservative that HairAide considers safe and effective. It is an excellent paraben-free option, especially when paired with potassium sorbate for comprehensive protection. A solid choice for clean beauty formulations that need reliable preservation.
Products That Contain Sodium Benzoate
Shampoos, conditioners, leave-ins, styling products, natural and clean beauty products
Alternatives to Sodium Benzoate
If you want to avoid Sodium Benzoate, look for products with these ingredients instead:
Potassium Sorbate, Phenoxyethanol, Ethylhexylglycerin
Frequently Asked Questions
Yes, Sodium Benzoate has a safety rating of 8/10 and is generally considered safe for use in hair products. Safe at cosmetic concentrations. When combined with ascorbic acid (Vitamin C) under certain conditions, benzene (a carcinogen) can form, but this is primarily a concern in beverages, not cosmetics. CIR panel considers safe at concentrations up to 5%. Low irritation potential.
Sodium Benzoate is CG-method approved and is generally considered safe for curly hair.
Yes, Sodium Benzoate is approved for the Curly Girl method.
Some alternatives to Sodium Benzoate include: Potassium Sorbate, Phenoxyethanol, Ethylhexylglycerin
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