Subcutaneous (into the fat just under the skin)
If combining, reduce thyroid hormone dose by 2550% and monitor for hyperthyroid symptoms: excessive sweating, tremors, palpitations, and anxiety
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& Meier-Ewert, K
Clean both vial stoppers with alcohol, draw 2mL of BAC water, and inject slowly against the vial wall
Common experiences after the first injection include: Mild soreness or redness at the injection site (usually resolves within 12 days) Slight improvement in energy levels or mood No immediate noticeable change (particularly common if deficiency is severe) Rarely, mild side effects such as headache or dizziness Some patients report their urine becoming brighter or more intensely coloured following injection, which occurs because excess B12 is excreted renally