(Cocamide diethanolamine) , a nitrosamine in all cosmetic ingredients is known to be carcinogen causing allergic reactions and contact dermatitis.
When it is applied to the skin, it is carcinogenic.
It is mostly found in shampoo.
The National Toxicology Program in the U.S. published in 1998 a study that topical skin application of cocamide DEA created in mice and rats liver tumours.
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