Looks like those wise men were on to something. Frankincense oil, long-heralded for its therapeutic benefits, may be an effective alternative therapy for bladder cancer, the fourth most common type of cancer among American men. In a recent University of Oklahoma study, oil of the frankincense herb Boswellia carteri successfully distinguished cancerous human bladder cells from healthy ones—and destroyed the bad ones. This potential cancer fighter also helps clear chest congestion, rejuvenates tired skin, and speeds wound healing. Add a few drops to your bath, or blend the oil with sandalwood, lemon, or bergamot oil for a soothing massage lube.