Mistletoe has been used as a cancer treatment since the time of the druids, and some modern medical research has confirmed this. It is also a treatment for high blood pressure which is its most common use.
In Australia, Mistletoes are a bushfood because of their delicious berries that tend to be white or pink/white when ripe. You can eat them green, but white is much, much better.
To use medicinally, take a standard tincture of mistletoe 3 times a day (5-10 drops) to help lower blood pressure, for petit mal seizures, and to assist with withdrawal from benzodiazepines (eg valium, midazolam). Be cautious, however, as certain species are mildly toxic and should not be used during pregnancy.