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Well, while the sublingual route would seem to be more effective in theory, research doesnt actually back it up

Among the excreted B12, we find the fraction secreted by bile that has not passed into the enterohepatic circulation, that which has not been absorbed from food, and that which has been synthesized in the colon by microorganisms (which cannot be absorbed since it is not found in the ileum and will never pass through it)

[DOI] [PubMed] [Google Scholar] 25.Bhatia P., Kulkarni J.D., Pai S.A

It is getting better with just a few here and there, I still have a sandpaper feel on my chest and back but not massive lumps everywhere

A study in 747 athletes and 104 non-athletes showed that low hemoglobin is more often found in people who do endurance compared to strength and mixed training [69]