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However, according to the Depending on the type of vaccine, symptoms may include: arm soreness swelling skin discoloration a feeling of warmth around the injection site low grade fever Pain is another common symptom

The dose and how often you take it depends on what you are taking it for

Stress-related disorders, including generalised anxiety and panic disorders

For those requiring supplements, cyanocobalamin and hydroxocobalamin are both effective forms available in the UK, with hydroxocobalamin preferred for injections due to superior tissue retention, as noted in the British National Formulary
