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Vitamin B12 (cyanocobalamin) is unique it is the only one that contains the mineral cobalt

Nervous System Issues : Vitamin B12 injections can sometimes cause nervous system problems, such as numbness or tingling in the hands and feet, muscle weakness, or difficulty walking

It is often given once a week or as directed by a healthcare provider

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And some evidence suggests that a combo of an mRNA vaccine with an adenovirus-based vaccine like J&Js could have some advantages

With intramuscular injections of B12, any excess will result in high levels within your blood so you may experience side effects such as headache, dizziness, tiredness, or gastrointestinal issues including nausea, until your body has metabolised any excess through your kidneys enroute to excretion via urine