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Convergent evidence across multiple independent sources (clinical trials, academic reviews, medical guidelines, practitioner experience) is stronger than any single source
[1] Because intrinsic-factor-dependent uptake in the distal ileum can be absent in conditions such as autoimmune gastritis, pancreatic insufficiency, or bariatric surgery, the intramuscular or subcutaneous route bypasses gastrointestinal barriers and reliably restores serum concentrations
Why Age Affects B12 Absorption As we get older, our bodies naturally go through changes, and one of those changes can affect how we process nutrients
Gaffney A, Himmelstein DU, Woolhandler S
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