Cocamide DEA (CDEA) — Frequently Asked Questions

The reasons are regulatory rather than technical. Diethanolamide chemistry can form nitrosamines if a nitrosating agent is also present in the formulation, and the material is listed under California Proposition 65. Several markets restrict or discourage its use, particularly in leave-on products. Its foam boosting and thickening performance was never in question, but formulators have generally moved to cocamide MEA or cocamidopropyl betaine.

Two things. It stabilises foam, producing a denser and longer-lasting lather from an anionic surfactant base than that base gives on its own. And it thickens, often dramatically, by promoting the growth of rod-shaped micelles that entangle with one another and raise viscosity. That combination of foam and body from a single low-cost additive is why it dominated shampoo and dishwashing formulation for decades.

Cocamide MEA is the closest direct substitute and gives comparable or better foam quality, though it thickens less, so salt or a separate rheology modifier is usually needed alongside it. Cocamidopropyl betaine is the other common route and brings mildness benefits as well. Neither is a like-for-like drop-in, and viscosity in particular will need re-establishing.

In many markets, yes. The restrictions that removed it from cosmetics relate to skin contact and leave-on exposure, and it remains widely used in dishwashing liquids, hard-surface and industrial cleaners, metalworking fluids and textile processing. Permitted-use status should still be confirmed for the specific application and destination market before it is designed into a product.