I have read this is caused by kidney problems in that their is too much acid in the blood stream and mucus is produced to protect the body and ends up in the sinus.
Eating acid forming foods could very well mean the identical theory.
Can sorghum cause acid?
I don't have a problem with any natural sugar/mineral product. I do not know the condition of others internally and can't say what would happen. The simple experiment is to stop the use and see what happens and we would never really be 100% sure what the results really mean, because the good supplements help the body eliminate acids....so good herbs should increase the removal of acids/mucus.
One of those things we need to self-experiment with; for me, I think it is the ideal supplement for the $$$.