What it is
Sodium Dehydroacetate is a water-soluble preservative that helps protect cosmetic products from contamination by bacteria, yeast, and mold. It is commonly used in sunscreens and skincare, frequently in combination with other preservatives, to maintain product stability over its shelf life. It performs best in mildly acidic formulas.
Safety & warnings
Sodium dehydroacetate is a widely used preservative considered well tolerated at the low levels permitted in cosmetics, though, like many preservatives, it can rarely contribute to contact sensitivity in susceptible individuals. Its use is subject to maximum-concentration limits in cosmetic regulations.
Origin & sourcing
Synthetic; manufactured as the sodium salt of dehydroacetic acid.
Questions everyone asks
Why is sodium dehydroacetate in my sunscreen?
It is a preservative that keeps the product from spoiling due to microbial growth during normal use and storage.
Is it used on its own?
It is often paired with other preservatives to provide broad protection across bacteria, yeast, and mold.