Before you turn a blind eye to this solution realize that undecylenic acid is just a fancy name for an organic, unsaturated fatty acid that is naturally derived from natural castor oil. Castor oil (for those unfamiliar) is a vegetable oil that is derived from castor beans. In the manufacturing process, the castor oil chemical bonds are broken down to create undecylenic acid. According to , it is a recognized natural fungicide that is FDA approved in over-the-counter medications for skin disorders or problems http:///mtm/undecylenic-acid- . It can also be found as the active ingredient in medications for skin infections and relives itching, burning and irritation.