C-Guard® is a unique blend of plant extracts and essential oils (Rosemary, Oregano and Garlic) developed by Mervue Laboratories. Plant extracts and essential oils have been used for many years both in humans and animal remedies and their benefits to health have been described. Plant extracts contain many biologically active compounds which have been found to possess antimicrobial, antioxidant, antiviral, antiprotozoal, antifungal, and anti-inflammatory properties.