I'm really glad you brought this up. I've just done a little research and it turns out olive leafs have some incredible properties here is just a faction of what they can do
"Olive leaf and extracts are utilized in the complementary and alternative medicine community for its ability to act as a natural pathogens killer by inhibiting the replication process of many pathogens.[1] [2] [3] More specifically, it disables infections long enough for the immune system to eliminate them and prevent pathogens from spreading."

and you can in fact make a tea from dried olive leaves which contains four times the antioxidants of green tea. who knew? well, i guess you did mat. ha

anyway great topic, if anyone finds out more let me know.