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Evidence quality varies by peptide, and individual response varies meaningfully
Individuals with Gut Absorption Issues : Conditions like Crohn's disease, celiac disease, or pernicious anemia (an autoimmune condition where the body can't produce intrinsic factor, a protein needed for B12 absorption) can significantly impair B12 uptake
Bioavailability: Cyanocobalamin works well for deficiencies but is used differently than natural forms
The treatment led to an immediate and lasting suspension of somatic symptoms, with anxiety resolving more slowly 9
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