Most clients experience no side effects, though minor redness, swelling, or slight soreness at the injection site may occur
In women with confirmed deficiency, milk levels are typically less than 100 pmol/L (135 ng/L).[9,12,39] A lower milk level threshold of 310 pmol/L (420 ng/L) for adequate infant B 12 intake has been suggested.[28] Three mothers in India with vitamin B 12 deficiency due to very low dietary intake were given a single 50 mcg intramuscular injection of vitamin B 12
5ml bacteriostatic water, 10 ×
For protocols in the 1-2.5 mg range, 3 mL keeps injection volumes manageable at 10-25 units per dose
Bacteriostatic water is sterile water with a small amount of benzyl alcohol (commonly about 0.9%) that inhibits bacterial growth, which is what lets a reconstituted vial be drawn from more than once