Disodium Cocoamphodiacetate

Disodium cocoamphodiacetate is an amphoteric surfactant used in cleansers and shampoos (typically a few percent in the finished formula) to boost foam and reduce the harshness of anionic surfactants. Patch-test and in-use data generally show it is milder than sulfates but still capable of causing stinging, dryness, or irritant contact dermatitis—especially with frequent cleansing, higher surfactant loads, or compromised skin barriers (eczema). Given its surfactant nature and cumulative irritation risk in routines, I rate it as mild rather than truly gentle for highly sensitive patients. Safety Notes: In commercial rinse-off facial and body cleansers, disodium cocoamphodiacetate is commonly used as a mild amphoteric co-surfactant/foam booster at low levels (~0.1–2%) in gentle or micellar-style formulas where it supports irritation reduction and viscosity. In higher-foaming sulfate-free shampoos, baby washes, and high-solids surfactant systems marketed to consumers, it can be a primary surfactant and is seen at much higher levels (often 5–12%, with some high-strength products reaching ~15% active). It is rarely used in true leave-on products; when present, it is typically at trace/low levels due to surfactant-related irritation and sensorial constraints.