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David It doesnt matter
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
People with a severe deficiency or absorption problems can feel the effect wear off sooner
[3] Those taking high-dose oral supplements without medical supervision also face increased risk
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