Isopropyl Lanolate

Isopropyl lanolate is a lanolin-derived emollient/skin-conditioning ester typically used at a few percent to improve slip and reduce transepidermal water loss. While often tolerated, lanolin derivatives have a well-documented risk of allergic contact dermatitis and irritation in compromised skin (e.g., eczema) due to residual lanolin alcohol/impurity sensitizers, making reactions more likely in sensitive populations. Given the non-trivial sensitization history and the stakes for barrier-impaired patients, I rate it as moderate irritancy. Safety Notes: In commercial products, isopropyl lanolate is often used at very low levels (~0.05–0.5%) as an emollient/skin-feel modifier and to aid pigment wetting in lotions, sunscreens, and color cosmetics, especially when lanolin-derived ingredients are included only for sensorial benefits. Typical leave-on creams and balms more commonly sit around ~1–5% where it functions as a substantive emollient and barrier-supporting lipid. The upper end (~10–20%) is observed in consumer-available anhydrous ointments, lip products, heavy barrier balms, and some hair pomades where it can act as a primary emollient; higher levels are limited mainly by greasiness, odor, and allergy-sensitization concerns rather than specific OTC regulatory caps.