Keep remaining powder frozen for later
Some clinics and individuals selling B12 injections direct to the public are stringently trained and follow their companys guidance to the letter, keeping good records
While not dangerous, they indicate significant vascular reactivity and suggest the nitric oxide system is responding robustly to the peptide
The sterile solution water for injection plus 0.9% benzyl alcohol inhibits bacterial growth without sterilizing the solution outright, which is exactly the property you want when a single vial may be drawn from multiple times over days or weeks
More water means more dilute solution and larger injection volumes
You should also make sure to stay clear of caffeine for at least an hour after taking your vitamin B12 supplement, as consuming coffee, tea, or even chocolate soon after taking your supplement may inhibit efficient absorption and promote early excretion