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For patients who are found to be deficient or who have difficulty absorbing vitamin B12 from food or oral supplements, we offer convenient in-office B12 injections

1 2 3 "Vitamin B12, folate, and the methionine remethylation cycle-biochemistry, pathways, and regulation" (PDF)

An absence of intrinsic factor is the most common cause of pernicious anemia

As an additional example to that of the trefoil peptides noted above, the peptide EGF (epidermal growth factor) is produced in human milk to promote growth of the gastrointestinal tract in newborn infants, but the same peptide aggressively stimulates the growth of breast cancer cells in adults