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This could be due to medical conditions like pernicious anemia or digestive disorders such as Crohns disease or celiac disease
All doses below come from published clinical trials, manufacturer guidelines, and established practitioner protocols as of February 2026
A few select patients have reported they felt their results lasted as long as 2 years
B12 injections generally work faster and suit people with absorption problems or severe deficiency, while supplements are a suitable, lower-cost option for mild, diet-related shortfalls
The presence of 0.9% benzyl alcohol helps inhibit bacterial growth, allowing for multiple uses from the same vial
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