There are some very rare side effects listed in medical literature (mostly when large doses are given): for example, one out of many thousands of patients might develop a disturbance in liver enzymes or a tingling in the fingers or toes
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Several benefits are said to be associated with these shots, including boosting energy levels and aiding weight loss
Vidal-Alaball J, Butler CC, Potter CC (2006) Comparing costs of intramuscular and oral vitamin B12 administration in primary care: a cost-minimization analysis
Munoz-Vendrell, A., Teixidor, S., Sala-Padro, J., Campoy, S