For Optimal gastrointestinal tract functioning, vital to the absorption of nutrients, elimination of waste, and proper immune function. Thorne Formula SF722′s main ingredient is Undecylenic Acid. This acid, the specific anti-fungal component which has been proven to kill Candida on contact, is extracted from castor oil. It not only kills Candida, it also cleans the liver and most other organs of the body. And unlike other Candida treatments, it doesn’t create resistant strains of yeast that are difficult to eliminate.