Rotating injection sites and applying gentle pressure post-injection can minimise discomfort
Another benefit is improved intestinal health, which is often underestimated but important for optimal physical performance
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
Bulletin of Experimental Biology and Medicine, 153 (2), 255-258
Systemic Resilience: Promotes recovery from both mechanical stress and the physiological demands of daily environmental exposure