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The benzyl alcohol in bacteriostatic water also suppresses bacterial growth, which is what allows the reconstituted vial to last 28 days in the fridge instead of 24 hours

Wellness 19 May 2026 6 min read How long do B12 injections last

Individuals with Gut Absorption Issues : Conditions like Crohn's disease, celiac disease, or pernicious anemia (an autoimmune condition where the body can't produce intrinsic factor, a protein needed for B12 absorption) can significantly impair B12 uptake

These can include redness at the injection site, mild nausea, or a feeling of warmth

Second, verify the powder was still intact before reconstitution