Oregano has been used since ancient times. Gaia Herbs Oregano Leaf is made with Oregano leaf extract and provides antioxidant support.* It is traditionally used to support healthy immune defenses.* â€¢ Antioxidant support with Oregano leaf extract. â€¢ Supports immune defenses to help you feel your best.* â€¢ Certified USDA Organic herbal liquid extract.