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[5] Vitamin B 12 is the most chemically complex of all vitamins, [2] [6] [7] and is synthesized exclusively by certain archaea and bacteria
For most people, the effects last about one to two weeks, though the exact timeline shifts based on your current B12 levels, metabolism, diet, and how often you get injections
Incorrect injection can cause pain, bruising, or swelling
Freezer (Unmixed): For long-term storage, place vials in a freezer
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