do b12 injections affect periods Understanding the Vitamin Shot: Benefits, Risks, and Dosage Guide Vitamin b12 in women: Dangerous
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For the buttocks, use only the upper outer quadrant
Awosemo, O., et al

Clinical observations and research protocols suggest a graduated approach to dosing, beginning with lower doses to assess individual tolerance and response before progressing to higher doses if needed

The NEJM article discusses people who had strong reactions to dose 1 and what they did to counter them
