What it is
This is a liquid diester of adipic acid and isopropyl alcohol with a low viscosity and dry, fast-absorbing feel. In sunscreens it functions as an emollient and a solvent that helps dissolve oil-soluble organic UV filters and improve their even distribution. It is often chosen to reduce greasiness and give a light, quickly absorbed finish.
Safety & warnings
Diisopropyl adipate is generally well tolerated, though as a penetration-enhancing ester it may cause mild irritation in some sensitive individuals and is sometimes reported as having low-to-moderate comedogenic potential at higher levels. It is not a known fragrance allergen.
Origin & sourcing
Synthetic, produced by esterifying adipic acid with isopropyl alcohol.
Questions everyone asks
What does diisopropyl adipate do in sunscreen?
It acts as a light emollient and solvent, helping dissolve oil-soluble UV filters and giving a dry, fast-absorbing finish.
Is diisopropyl adipate likely to clog pores?
It is sometimes reported to have low-to-moderate comedogenic potential at higher concentrations; those prone to breakouts may prefer to patch test.