Sodium Formate

Sodium formate is the sodium salt of formic acid, a naturally occurring organic compound. In cosmetics, it functions primarily as a preservative and pH buffer, helping to maintain product stability and prevent microbial growth. It is derived from formic acid, which occurs naturally in ant venom and stinging nettles, though the cosmetic-grade ingredient is synthetically manufactured.Unlike its parent acid, sodium formate is pH-neutral and less irritating, making it a gentler alternative when formulated into skincare products. It typically appears in both leave-on and rinse-off formulations, …

Sodium formate functions as a preservative by creating an environment less favourable for microbial growth. As a salt, it also works as a pH buffer, neutralising excess acidity in formulations. When formic acid is used as a pH adjuster in a skincare product, it is neutralised to form sodium formate, which eliminates the irritant properties of the free acid whilst retaining the preservative benefit.

Sodium formate is a background functional ingredient, not typically a featured active, so there are no specific usage guidelines for the consumer. Simply use the product according to the manufacturer's instructions. It works most effectively as part of a broader preservative system within a formula.

Sodium formate is well-tolerated in cosmetic formulations at typical use concentrations. At significantly elevated concentrations, mild eye irritation is possible, though this is not a concern in standard skincare products.