We are under a naturopathic specialists care for this protocol for our daughter, so we do not purchase the ingredients and make our own tincture.
Dipsacus Spp. Sylvestris (Teasel Root) can be prepared in a glycerite but it does make it 'clumpy' or 'coagulated'; so, it is prepared w/a small amount of a particular pure alcohol. One species of the plant is used in Chinese medicine.
I do not know our physician's source; however, we do know that he has visited personally where it is harvested and spent considerable time with the researchers, scientists and in plant to see (and approve) the process. It is produced only by a hand full of individual herbalists around the country.
Two good sources to read about Teasel Root include "The Book of Herbal Wisdom " by Matthew Wood. And - Healing Lyme by Stephen Buhner, Master herbalist. He has studied the medical journals as well as protocols used by herbalists and is an expert for Lyme disease.
Teasel Root must be dosed appropriately or the patient will experience negative and sometimes serious herx symptoms. It is to be administered slowly, lower dosage and gradually increased to the physician's recommended dose for the patient; and each patient is different based on their own symptoms, pathogens, complications, etc..
I hope that helps!