Read Ask Andreas Moritz Forum and see if you can find some info. Or if his forum is open for questions put your Q there too.
Read his website http://www.ener-chi.com and if you feel you can relate to him buy his book Timeless etc.. Filled with lifestyle changes, cleansing, answer to some medical problems etc.

White Oak Bark
American Indian knowledge employs White Oak Bark and other types of oak barks for swollen neck and goiter (enlarged thyroid gland). To correct bloody urine discharge due to ulcerated bladder as well as sinus, post nasal drip and varicose veins, White Oak Bark is employed. White Oak Bark can be applied externally as well as internally with great benefit. Externally, cover the area with Vitamin E oil from capsules. Soak cotton gauze in the extract and put over area after applying Vitamin E. Follow that with a plastic wrap and hold in place with a cloth wrap. White Oak Bark shrinks varicose veins and hemorrhoids. It is a powerful Antibiotic for all infections. Its astringent qualities quickly stop diarrhea. For swollen glands such as prostate or relaxed anus, the herbalist, Alma Hutchens, reports Oak Bark Tea often dissolves and remedies dangerous fistulas, such as anal fistulas (wild, alternate channel from the rectum to the outside of the body). For this, the method to use is a Sitzbad (German word for sit-bath). Prepare the bath by diluting 40 drops of the extract per cup of fluid for the sitz bath. Stay in this warm water for 15 to 45 minutes daily as needed. Add additional hot water with White Oak Bark Extract as needed to keep the bath warm. For sinus congestion and post nasal drip, or relaxed throat, 1 teaspoonful to 1/2 cup water as a gargle.

DOSAGE:
10 to 40 drops three to four times per day. If sinus problem crisis, 40 drops hourly until relief.
http://www.everythingherbs.com/content/ibs/ibs.cfm