What it is
Dipropylene glycol dibenzoate is the dibenzoate ester of dipropylene glycol. In cosmetics it functions as an emollient and as a plasticizer that softens and improves the flexibility of films formed by other ingredients, which is useful in long-wearing sunscreens and makeup. It can also act as a solvent for other oil-soluble components.
Safety & warnings
Benzoate esters of this type are generally well tolerated in cosmetic use. As an oily ester it contributes to the lipid phase of a formula, though it is used as a functional emollient rather than a heavy occlusive; individual sensitivity is uncommon.
Origin & sourcing
Synthetic ester made by reacting benzoic acid with dipropylene glycol.
Questions everyone asks
Why is dipropylene glycol dibenzoate added to sunscreen?
It softens the formula and helps make the dried film more flexible and even, improving feel and wear.
Is it the same as a preservative?
No. Despite the benzoate name, it is an emollient and plasticizing ester, not a benzoate preservative like sodium benzoate.