b12 injection dose for pernicious anemia Are Vitamin Shots Right You? B12 Injection Dosage and Frequency:

They also contain vitamin B12

The longer you have sciatic nerve pain, the higher your chances become of having nerve damage

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

2022 Apr;26(7):2443-2459

[205] Preparation of the reduced forms of vitamin B12 and of some analogs of the vitamin B12 coenzyme containing a cobalt-carbon bond

It is important to wash your hands to reduce your likelihood of getting an infection