The answer depends on three factors: your current dose, your highest planned dose, and your syringe quality
The choice of solvent affects stability, safety, and shelf life
None of these vitamers, as they are called, can be synthesized from simple molecules in the lab, so supplements have to be produced by fermentation using the same bacteria that make B12 in animals
For intramuscular injections , which are common for administering Vitamin B12, needle lengths usually range from 5/8 inch to 1.5 inches
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[12] They should be stored at controlled room temperature, typically around 20C to 25C (68F to 77F), and kept in a clean, dry place