Birch Bark Betula lenta by W.B.
Historically Birch tea made from the inner bark of Birch, is used as a remedy for gout, rheumatism, and dropsy. It is effective in eliminating kidney stones and is used as a blood purifier. The bark can also be used as a mouthwash, or as a remedy for diarrhea, dysentery, cholera infantum, bowel problems, and neuralgia. Applying Birch bark to sore muscles eases muscle pain, and helps heal sores, boils, and canker sores in the mouth. A decoction made from the bark is used in treating skin eruptions and dropsy. The oil is used on skin rashes such as eczema. Due to its diuretic quality, Birch leaf is used in treating cystitis and other urinary problems, rheumatism, gout, mild arthritic pain, and in expelling intestinal worms.
The German Commission E has stated that the Birch leaf can be used for, irrigation therapy for bacterial and inflammatory diseases of the urinary tract and for kidney gravel; supportive therapy for rheumatic ailments.
In 2006 the online edition of Bioorganic & Medicinal Chemistry had this to say: The bark of the White Birch tree contains a compound that might help fight prostate cancer. This compound is called betulinol. Preliminary tests show that betulonic acid, made from betulinol, may discourage human prostate cancer cells from dividing and spur those cells to die. Brij Saxena, PhD, who works in reproductive endocrinology at Cornell University’s Weill Medical College and her colleagues are the ones who conducted these tests. In a lab the researchers exposed isolated human prostate cancer cells to betulonic acid for up to three days. For comparison, they also grew prostate cancer cells not exposed to the compound. After these three days, all the prostate cancers had grown. But those with the betulonic acid grew 88% less. The research also showed that betulonic acid did not affect normal cells.