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b12 injections health risks What You Need to Know About Vitamin Vitamin B12: What It Is,
Description
Not the muscle

doi: 10.1371/journal.pone.0179538 76 StanleyTLChenCYBranchKLMakimuraHGrinspoonSK

Serious Side Effects : Rarely, allergic reactions can occur

Production of gastric acid and intrinsic factor by the specialized parietal cells in the stomach is critical for B12 absorption to occur

While Vyas noted that the product seemed low risk, he is hesitant to use it in his own practice before more robust clinical trials with long term follow-up data are published
