One of my absolute favorite holistic go-to remedies during cold and flu season is a special blend of essential oils that often goes by the name Thieves Oil.
This blend, which consists of clove, rosemary, eucalyptus, cinnamon and lemon essential oils, creates an effective and all-natural barrier to airborne pathogens, both viral and bacterial, and is arguably one of the best ways to make for an ironclad immune system.