Zinc Undecylenate is a natural or synthetic fungistatic fatty acid derived from castor oil. The zinc provides an astringent action, reducing rawness and irritation. Zinc undecylenate is an antifungal agent, which can be used to clean the skin or prevent odor by destroying microorganisms. It can act as a co-emulsifier. Antifungal zinc undecylenate is used topically in creams against fungal infections, eczemas, ringworm, and other cutaneous conditions.