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
The 5mg format provides researchers with a practical quantity of material suitable for multiple laboratory applications while supporting accurate measurement, handling, and experimental consistency
Peptide therapy works because it addresses these root causes rather than masking the symptom
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The injection site in the documentation determines the code, not the drug