how b12 injections subcutaneous at Home - Safety Guide for Self-Administration Best Vitamin B12 Injection Sites:
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So yeah, no wonder people are worried

& Chehrei, A

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(2008) Journal of Molecular Endocrinology Comparative in-vitro study of lipolytic potency and selectivity among AOD 9604, native GH, and common antidiabetic agents

The needles are very thin so the treatment itself is not painful for most people
