Olive Leaf Extract has antibacterial, antiviral and antiparasitic properties.

Olive Leaf may be an effective treatment for fighting bacteria, viruses, fungi and parasites, colds, flu, high blood pressure and reducing the risk of atherosclerosis. Olive Leaf Extract is non-toxic. However, a "die off" or Herxheimer's reaction may occur from killing too many pathogens too quickly. This is experienced as "flu-like" symptoms or allergic attacks which pass quickly leaving you feeling much better than before taking the extract. Someone at risk for Herxheimer's should try a reduced dose at first, then work up.