Until recently, one of the most popular cosmetic raw materials, especially among washing cosmetics, was Sodium Lauryl Sulfate (SLS) – a sodium salt of lauryl sulfate. This material, however, was characterized by a significant degree of skin irritation, a relatively low aqueous solubility and limited possibilities to thicken the cosmetic formulation. Today, SLS has been mostly replaced by its ethoxylated derivative - Sodium Laureth Sulfate (SLES).