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Statements like no history of gastrectomy, no evidence of terminal ileum disease, no strict vegan diet help exclude D51.8 (other B12 deficiency anemias)

Age-related morphological changes in neurons have been extensively documented in C

121 Taking L-DOPA at least 30 minutes before consuming protein and/or having your highest protein meal at a time when L-DOPA is not needed may be an effective strategy

Singh N, Bhattacharyya D (2017) Biochemical and functional analysis of corticotropin releasing factor purified from an aqueous extract of human placenta used as wound healer

From here, the vitamin enters nearby blood vessels without relying on digestion