Thanks for pointing out this alternative.  I was contrasting dietary supplements (as in an oral pill).  The sublingual route is different and clearly effective.  I should say, swallowing a B12 tablet won't address pernicious anemia, and incidence of ...

A recent article in AARP Bulletin discussed the importance of taking vitamin D and vitamin B12 supplements.  Concerning B12, the incidence of an autoimmune disease, called pernicious anemia, increases alarmingly as we age.  This condition cannot be a...