Sodium Laureth Sulfate and its close relative, Sodium Lauryl Sulfate (SLSs) and Sodium Tallowate, or Tallow are NOT found in South of France soaps. Sodium Laureth Sulfate and Sodium Lauryl Sulfate are inexpensive synthetic foaming agents and degreasers, widely used in commercial soap production. In industrial application, SLSs are mainly used as engine degreasers, floor cleaners and car wash soaps. SLSs are commonly used in clinical trials to intentionally irritate the skin, so that researchers can measure the rate at which skin heals. SLSs are linked to eye irritation, rashes on the skin and scalp, and other allergic reactions. South of France soaps do not contain Sodium Laureth Sulfate or Sodium Lauryl Sulfate. South of France soaps produce rich, dense foam naturally, and are gentle to the skin. Sodium Tallowate, or Tallow, is animal fat, and is found in many commercial soap products. It is inexpensive, plentiful and has been known to clog pores. South of France takes pride in the fact that our products never contain any animal by-products and are cruelty-free (never tested on animals).