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Unlike other treatments injected into the veins, B12 shots are administered into the muscles to avoid losing a huge amount when the person passes urine

Blood Adv (2021) 5(5):116477
As a result, benzyl alcohol is frequently used in low concentrations in human medicine as an antimicrobial preservative in Bacteriostatic water to inhibit bacterial growth

doi: 10.1016/0022-3956(90)90041-N

Others need them a little more often at first

Lose Weight with B12 Shots
