Olivir 15 by Foodscience Of Vermont.An olive leaf extract supplement to support Defense mechanism of body function. Olivir brand olive leaf extract is standardized to yield 75 mg a minimum of 15% Oleuropein. Olivir works by stimulating your body's protective cells (phagocytes) to ingest foreign matter. It has no impact on "friendly" intestinal microorganisms. Thus, it can be used to support the Defense mechanism of body when invasive microorganisms are present.