video of b12 injection How to Give a Injection: Step-By-Step Instructions Ivy Grove Surgery : Self-administration

So, if you're low in B12, then fatigue and general weakness are going to be one of the main symptoms

B12 deficiency has a small number of common causes worth recognising before reaching for an ampoule

A metallic taste during the infusion

Because levels are often quite low before a deficiency is recognized, it can take some time for serum concentrations to even out and symptoms to subside

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