I'm baffled that this hasn't come to my attention until now but I'm guessing there is a reason. I've found an "intrinsi b12" product that includes intrinsic factor as one of its ingredients. As a lot of you will know, an easily-exhausted amount of IF produced in the gut is what limits the amount of B12 that can be absorbed through oral supplementation. I'm assuming that there is a reason that nobody has tried or thought to supplement IF directly? Until now I just assumed it wasn't something that you could even supplement.