vitamin b12 im injection side effects What are the known or adverse effects of subcutaneous (under the skin) cyanocobalamin (Vitamin B12) injections? Side Effects of Vitamin B12
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The risk of injecting denatured peptide or contaminants is not worth the cost savings of trying to salvage a compromised vial

Zinc deficiency can cause serious disturbances in the functioning of GABA receptors, leading to increased anxiety and other neurological symptoms

Nerve Function: B12 is critical for maintaining the protective myelin sheath that insulates your nerves
Parkinsons Disease

But, even insulin needles vary by size and gauge

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