Dibutyl Adipate

Dibutyl Adipate is an emollient/solvent used in leave-on cosmetics (often a few percent up to the low tens) to improve slip and reduce tack, and it is generally well-tolerated in human repeat-insult and patch-testing data with low rates of irritation. While not truly inert—occlusion and individual barrier impairment can make any ester feel stinging on compromised eczema skin—its intrinsic irritancy and sensitization potential are considered low at typical use levels. Given sensitive-skin safety priorities, I rate it as very gentle rather than completely inert. Safety Notes: Dibutyl Adipate is used in cosmetics primarily as an emollient/solvent and slip agent, so at the low end it appears around ~0.1–1% in leave-on creams/lotions and color cosmetics where it fine-tunes sensorial feel or helps dissolve lipophilic ingredients. In higher-slip, anhydrous or high-oil systems (e.g., makeup primers, certain foundations/lip products, sunscreen/oily serum-type textures), it can be a major part of the ester/oil phase, with OTC consumer products observed in the ~10–40% range. It is generally more common in leave-on formulations than rinse-off, where usage tends to stay toward the lower end due to cost/need and wash-off profile.