Discover the Health Benefits of Castile Soap If you are reading this, you might be looking for natural soap, and Castile soap is one of your options. Castile soap is a proven effective soap for all types of skin. In fact, it is most recommended for people with sensitive skin. It is a mild soap made with natural and organic ingredients, such as vegetable oils and essential oils. If you are living in Singapore, you can try these certified organic Castile soaps.