Isopropyl Lauroyl Sarcosinate

Isopropyl Lauroyl Sarcosinate is a fatty-acid–derived emollient/solubilizer used in leave-on and rinse-off products (often a few percent) to improve slip and reduce greasiness, and it is generally considered low-irritancy compared with harsher surfactants. However, as a lipophilic ester-like ingredient it can still sting or worsen reactivity in compromised barriers (eczema, post-procedure) and may contribute to cumulative irritation in multi-product routines, so I score it as gentle but not "exceptionally" gentle. Safety Notes: Isopropyl Lauroyl Sarcosinate is used as a lightweight emollient/slip agent and solubilizing co-emollient in leave-on products, where it can appear at low levels (~0.1–1%) to improve skin feel in serums, lotions, and sunscreens. In the consumer market it is also used at much higher levels in anhydrous/oily systems (makeup primers, facial oils, cleansing oils/balms, and some silicone-free slip bases), where it can be a primary emollient and reach ~10–20% while remaining OTC. Rinse-off cleansers typically sit in the mid range (often ~1–8%) as a refatting/slip component, with the highest levels mostly seen in leave-on or anhydrous formats rather than traditional surfactant-rich washes.