From the summary of this research:
“This study … provides the evidence that Xin Yi San alone is an effective herb in the treatment of perennial allergic rhinitis.” (Note: Xin Yi San is the TCM name of the formula, in this case, of only one herb, Xin Yi Hua, or Magnolia Flower.)
In my office, I usually have on hand at least 2 or 3 TCM herbal formulas with this herb in them. For example, the primary herbal formula I recommend for seasonal allergies, or allergic rhinitis, is Bi Yan Pian. A description of this formula can be found here. I have many people come back yearly for this formula plus they always recommend it others! I have other options as well, including homeopathic remedies for allergies. The best thing is that there are no side effects such as drowsiness like conventional anti-histamines!
I also carry “Magnolia Clear Sinus” and “Pueraria Clear Sinus” from Evergreen Herbs, both formulas that are very excellent for sinus infections.