You only need preservatives in waterbased compounds. Soaps don't need it, and balms, which are just a blend of oils usually only need antioxidants to prevent the oils themselves going off and losing their properties, vitamin E is a popular antioxidant. Vegetable oils don't provide an environment for bacteria to grow.

rosehannah - they have their ingredients listed on their website, but it's spelled billie goats soap. Couldn't find ingredients for their bars of soap tho, but they have them for their liquid soap.