on guard is an essential oil that helps to support the immune system. It can be used topically or diffused, and it is a safe and effective way to help protect against bacteria and viruses. on guard is a blend of orange, clove, cinnamon, eucalyptus, and rosemary essential oils. This combination of oils makes on guard a powerful weapon against illness. It can help to fight off colds and flus, and it can also help to boost the immune system. diffusing it in your home or office can help to create a healthy environment, and using it topically can help to keep your skin healthy. on guard is an oil that Michele Cook uses daily, and she highly recommends it for anyone looking for a natural way to support their health.