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For example, when treating frequent migraines, a trained professional injects the muscles of the neck and head

FAQ What is the recommended dosage for Vitamin B12 injections

Int J Drug Dev Res 3 Narang N, Sharma J (2011) Sublingual mucosa as a route for systemic drug delivery

Rana P et al

Acute symptoms such as fatigue may improve within days, whilst neurological symptoms like paraesthesia typically require weeks to months of treatment