I have always known of thyme, oregano, tea-tree and citronella, as being effective anti-pathogen agents.
I have taken relatively large doses of oregano & neem oil internally and want to try some lemongrass essential oil.
People always say that tea-tree oil shouldn't be taken internally, yet I recall a few years ago sucking on tea-tree oil lozenges, sold as an immune enhancer, without ill effect.
Also, there was that fascinating poster here at Curezone - 'Sunver' - who kind of dazzled me with his apparent inside knowledge of chemtrails and his unnerving explanations of the phenomenon ....
He mentioned that he imbibed essential oils to combat fungus.