mrsD, question in regards to your reply.
I have taken B12 sublinguals in the past 3 weeks after a meal. as I understood from you, it's considered oral because the saliva is swallowed with the b12 dissolved in the mouth.
Nevertheless, my body seems to receive the B12 because my symptoms have improved.

Can I conclude my intrinsic factor is good and the presence of food doesn't hinder absorption?

Thanks.