Bayberry (Myrica cerifera) In folk medicine Bayberry has been believed to be used internally as a tea for its stimulant properties and in the treatment of diarrhea. The plant is believed to be an astringent which may account for its use in treating diarrhea, as well as its topical use for wound healing. It is believed that it improves blood circulation, promoting perspiration, as well as to avoiding bacterial infections. It is believed to be a preferred treatment for common cold, coughs, and flu. It is believed that the astringent properties help cure intestinal problems, like IBS, and Colitis (IBS but distinguished by the passage of abnormally great amounts of mucus.