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Anaphylactic shock and death have been reported after parenteral vitamin B 12 administration
"Research chemical" peptides from unregulated sources carry additional risks unknown purity, incorrect concentrations, contamination
Hobson, B
How can a vitamin B12 deficiency develop
Many diseases, including diabetes, have been associated with damage and loss of small unmyelinated or lightly myelinated fibers of the peripheral sensory and autonomic nervous system, termed small fiber neuropathy (SFN)
The effects might be additive, synergistic, or potentially counteractive depending on specific circumstances
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