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Generally, the effects last between two to three months
Summary: Feeling worse after a B12 injection typically reflects your body adjusting to replenished vitamin levels, triggering metabolic processes that may temporarily cause fatigue, headaches, or injection site discomfort
Confirm the actual supplied form from the batch COA
Patients can usually return to their regular activities immediately afterward
Source quality and purity 3
[4] The liver stores approximately two to five years' worth of B12, which means deficiency may not become clinically apparent until well after surgery
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