can vitamin b12 injections have side effects

https://elonhealthurgentcare.com/assets/pages/are-b12-injections-safe/img2.jpg MCF Series:Builder Series 4-12 weeks 1 x 10 mL bottle 4 weeks: 2 vials use 4 mL total Note from Dr - insurance & injections : r/B12_Deficiency

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