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Low B12 levels are associated with symptoms like: Fatigue or low energy Difficulty concentrating Numbness or tingling in hands and feet Swollen, inflamed tongue Dizziness or unsteadiness Muscle weakness Vision problems like blurriness or double vision What are the possible B12 injection side effects
National Health Service
Benzyl alcohol may cause allergic reactions
However, if your B12 levels are already within a healthy range, you may not experience a dramatic or long-lasting energy boost
Guidelines suggest starting with a daily or weekly dose for the first month
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