From what I understand from other biotechs I've been involved with, the sublingual absorption is a much better delivery than buccal absorption. I even took vitamin D for a while as a sublingual because I had to get as much in my system as fast as I could and that was the way to do it.

Both methods go directly into the bloodstream, but the chewing gum thing? I expect that to go as far as buccal delivery of insulin did. Never really heard of it? Exactly.