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Measuring serum B12 concentration A medical specialist received a letter stating, you have treated people with normal serum B12 concentrations with B12 injections, for which there is no proof
If you increase dose and change timing simultaneously, you cannot determine which change affected results
If you already have a diagnosed deficiency under NHS care and your symptoms return before your next scheduled dose, that is a conversation to have with your GP, who can review the schedule
In a clinical or home setting (with proper guidance), it is often injected in areas such as the upper arm, thigh, hip, or buttock
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