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While they recommend considering an anti-intrinsic factor autoantibody test if AIG is suspected, the guidelines do not adequately explain why general practitioners should suspect an autoimmune basis beyond typical gastrointestinal symptoms

Cognitive Enhancement Research Dihexa Dihexa has been directly tested in cognitive paradigms (aged rat water maze, scopolamine reversal) and demonstrates synaptogenesis through HGF/c-Met signaling, providing a more direct cognitive enhancement rationale than PE-22-28 Neurogenesis and Mood Research PE-22-28 PE-22-28 induces hippocampal neurogenesis within 4 days and demonstrates antidepressant-like effects through TREK-1 blockade, making it more relevant for mood-cognition intersection research Oral Bioavailability Requirement Dihexa Dihexa has demonstrated approximately 38% oral bioavailability with BBB penetration, while PE-22-28 oral availability has not been characterized Lower Theoretical Risk Profile PE-22-28 PE-22-28 targets an ion channel without known oncological associations, whereas Dihexa activates the HGF/c-Met pathway which is a characterized oncogenic signaling axis Evidence Reliability PE-22-28 PE-22-28 has no retracted publications in its evidence base, while a key 2014 Dihexa paper was retracted for data fabrication concerns Continue Your Research Get comparison updates We publish new head-to-head comparisons regularly

The 27 studies were published between 2016 and 2025 (Supplementary Figure S1)

While peptides can be mixed in the same syringe immediately before injection, they should be stored separately to prevent interaction