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side effects from vitamin b12 injections How Quickly Does Shot Work? Does It Help to Lose Weight? What Are B12 Shots? 5
Description
Conjunctivitis has been reported during postmarketing use (2,3,5)

Effectiveness of MIC and B12 injections in weight loss

Lussier-Cacan et al, 1996)

The serum needs to make contact with your scalp, not coat every strand of hair

Unless instructed by a health care provider, this injected site is not recommended because untrained injectors may damage the sciatic nerve
Just a thought, have you had your ferritin checked