I have heard of members using out of date ampoules, but not as out of date as yours
refrigeration at 4 C (39 F) is acceptable for short-term storage (days to weeks)
Consult your healthcare provider if you experience persistent or severe side effects
N Engl J Med 368
Vitamin B12: The Energy and Nerve Vitamin Vitamin B12 is a water-soluble vitamin essential for blood formation and neurological health

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