Cocamide DEA (CDEA) is a viscous liquid that is used as a foaming agent in a variety of personal care products, such as shampoos, soaps, and facial cleansers. It is derived from coconut oil and diethanolamine, and is used to create a rich lather and enhance the texture of these products. However, there is some controversy over the safety of CDEA, as it is a known skin irritant and has been found to contain small amounts of a potential carcinogen called nitrosodiethanolamine (NDEA). In some countries, CDEA is either banned or restricted for use in personal care products. It's important to always read labels and be aware of potential risks associated with any personal care product you use.