The evidence levels reflect the current state of research specifically in autoimmune applications, not the overall evidence base for each peptide
What the research is telling us Low Levels of B12 found in postmortem brains In the samples of 12 postmortem autistic brains, the level of B12 was 3x lower than in typical postmortem brains
Iyer KS, Marks GA, Kastin AJ, McCann SM
Pernicious Anaemia Society Out of date vials of B12 how strong are they
[10] [11] Intramuscular B12 injections (hydroxocobalamin or cyanocobalamin) bypass the digestive system, but UK product information (SmPCs) for hydroxocobalamin injections does list gastrointestinal disturbances, including diarrhoea, as possible adverse reactions, albeit rare
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