is this a good one http://www.vitaminshoppe.com/store/en/browse/sku_detail.jsp?id=BB-1408
wow, how did you come across this rare finding, osha?
I've this, too, but I don't think it's an allergy.
The exact mechanism behind it is still unclear to me.
One possibility is laryngo-pharyngeal reflux (LPR). In LPR, low-level mucus production in the lungs leads to the necessity of "clearing your throat" repeatedly:
https://forums.phoenixrising.me/threads/gastrointestinal-reflux-as-dysautonomia.86644/