This formulation, previously known as Dr. Z's Parasite/Bacteria Control Formula, contains the powerful and highest quality herbals Sweet Wormwood, Olive leaf, Oregano, Grapefruit seed extract, Berberine, and Goldenseal Root. These herbals have historically been used to fight intestinal infections by parasites, bacteria and yeast/Candida. Anyone who suspects that they may be experiencing digestive problems associated with these infectious agents should start taking this product immediately. Also consider using this product in conjunction with Dr. Zimmer's G.I. Eco Formula "Y".