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Baumann is an endocrinologist, now professor emeritus at Northwestern University
The peptide is also unusually stable in stomach acid for a peptide, so an oral capsule format exists and is sometimes used in gut-focused research planning
The following three-test approach, described by Carmel (2008, Annual Review of Nutrition), gives a more complete picture: Serum B12
Injection discrimination There are often comparisons made between insulin and B12 injections and whilst everybody understands that insulin is essential and required by each patient in different amounts some health professionals mistakenly think that B12 is a placebo, a frivolous want for lazy people with hypochondria and Munchausens Syndrome
For patients with impaired liver function or genetic variants affecting B12 metabolism, methylcobalamin may be preferable
