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That was my first hint at just how fragile this whole system is how much depends on crowdsourced trust and trial-and-error
B12 injections can help to boost your immune system, giving your body the tools it needs to fight off infections and illnesses
Peptide stability, solubility, and formulation research
Association of vitamin B12 deficiency in people with type 2 diabetes on metformin and diabetic peripheral neuropathy Nature article: Shows prolonged metformin use correlates with lower B12 and more severe diabetic neuropathy
Although MedlinePlus says that Normal values are 160 to 950 picograms per milliliter (pg/mL), the clinical reference UptoDate says that a normal serum vitamin B12 level is above 300 pg/mL
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