Sodium laureth sulphate and ammonium laureth sulphate are slightly milder detergents, but are produced by a process called ethoxylation which is very damaging to the environment. (odylique.com)
SLES is often contaminated with 1,4 - dioxane, a byproduct of a petrochemical process called ethoxylation which is used to process other chemicals in order to make them less harsh. (drunkelephant.com)
These additives are the product of ethoxylation (weakening of harsh chemical in the manufacturing process), which simultaneously produces carcinogens and dioxanes.1 (bathnbody.craftgossip.com)