Oregano Oil is known as one of nature's most powerful anti-fungal and anti-viral herbs. Its natural anti-septic properties make it excellent for killing off parasites and maintaining a healthy immune system. California Natural's Oregano oil contains 60% to 75% carvacrol, which is the main active ingredient. Disclaimer These statements have not been evaluated by the FDA. These products are not intended to diagnose, treat, cure, or prevent any disease.