Dr. Jacobs was a Swiss chemist that perfected the long-standing Castilian tradition of making Jabon de Castilla or Castile soap before the turn of the nineteenth-century. Today, they still use the same recipes and work to uphold the long-standing tradition of making natural Castile Soap products. Their soaps are made with natural and pure ingredients that produce a mild and creamy lather making it safe to use on even the most sensitive skin types.