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Variable absorption is the likely cause
If you're 50 or over, your doctor may recommend a B12 shot after a significant blood test
Cyanocobalamin injections : Popular for their stability and effectiveness
No special considerations beyond standard technique
Reviewing the historical literature also reveals that the introduction of bacteriostatic water for multi-dose injectable preparations dramatically reduced contamination incidents in hospital and research settings in the mid-20th century
The typical form of B12 used in doctors offices is cyanocobalamin, a cheaper and subpar form of B12
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