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where b12 injections are given subcutaneous or intramuscular How to Give B12 Injections at Home to Yourself · PA Boost Your Energy with B12
Description
A single 50 mg vial lasts roughly 10 to 20 days at these subcutaneous doses

It is recommended that anyone who administers a B12 injection should receive training and guidance from a healthcare professional
For example, how bad the deficiency is, or if the body cant absorb it well

This reflects its different chemical nature as a small molecule rather than a peptide

Freeze-dried peptides maintain long-term stability, potency, and reliability for research applications