Undecylenic acid is an extremely effective, well-tolerated, broad-spectrum antifungal compound derived from the vacuum distillation of castor bean oil. It works, in part, by inhibiting the ability of Candida to convert to its virulent mycelial phase. Several studies have demonstrated that undecylenic acid is 4-5 times as powerful an antifungal agent as caprylic acid in the same dosage.3-5 Calcium undecylenate is a stable calcium complex of undecylenic acid that delivers potent anti-Candida activity with greater stability and a longer effective shelf life.