[1] Use a new sterile needle and syringe for each withdrawal (multi-dose vial technique), and swab the rubber stopper with alcohol
Vitamin D or B12 may be part of the picture, but your provider will want to look more broadly, and blood work is often part of that evaluation
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But here's what most providers won't lead with: not every injection is created equal, not every symptom needs a needle, and not every clinic operates with the same standards
Further studies are needed to determine whether other factors may also be involved
Aim the needle at the side of the glass vial so the liquid drips down slowly