Used for centuries in traditional Chinese medicine, oregano oil is well known for helping to maintain immune health. Nature's Way Oregano Oil is standardized to contain 75-85% carvacrol, the active component found in oregano leaves. One convenient capsule each day provides extra support for your immune system. Sensitive to individuals with dietary restrictions or preferences, Nature's Way offers Oregano Oil Standardized Extract in liquid form in the patented, plant-derived capsules known as Vcaps.