It is difficult to explain such things to people who put their mainstream doctors at the head of society.
But remember that Traditional Chinese Medicine and East Indian Aryuvedic medicine has been around for 1000s of years. They work. No scientific data to support it. Only anecdotal evidence. Well western folk medicine is the same, only younger. Anecdotal evidence. http://dictionary.reference.com/browse/anecdotal+evidence
Then there is also Old Wives Tales.
That won't help those who have narrow minds. Not until they experience it for themselves, or from a family member or friend.