Incorrect injection can cause pain, bruising, or swelling
Vitamin B12 injection IV or IM searches are common, but intravenous use should not be assumed unless a clinician specifically directs it
How to Calculate Any Concentration If you use a non-standard amount of BAC water, or want to verify any figure in the table above, the formula is: Concentration (mcg/ml) = Total peptide in vial (mcg) BAC water added (ml) Example: 5mg vial = 5,000mcg
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Always good to have a reason I have also had this happen when my folate was low , it may be worth you getting it checked I had self inject my B12 every 4 weeks for the last 20+ (cannot really remember how long accurately), and 2 months ago got a similar 'electric shock tingling' all over my body - head, face, arms, hands, legs, feet etc within a couple of minutes of injecting, which lasted about 3 seconds or so