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If you experience any signs and symptoms of serious side effects when taking Vitamin B12, talk to your doctor or emergency care
As serum B12 levels drop below whats considered deficient, MMA levels start to increase more drastically (Clarke, 2003)
Generally, individuals can expect to experience the effects of a B12 injection for several days to a few weeks before requiring another dose
Judson, G., Babidge, P., Chen, Z., & Sansom, L
Heres why: Less pain Do B12 injections hurt
Your age, activity level, and physical health may also be factors
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