The FDA has raised concerns about purity, immune reactions and the lack of human 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
Five nights on, two nights off is the other common protocol
Consider your daily routines, comfort with different administration methods, and lifestyle factors like travel frequency when choosing between oral and injectable options
Dosing tiers: Fasted administration is standard protocol
That single interaction has downstream effects across several healing pathways: it supports stem-cell migration to injury sites, promotes angiogenesis (like BPC-157, but through a different mechanism), and dampens inflammatory signaling during the repair phase