When B12 runs low, symptoms tend to creep in slowly enough to get blamed on something else: persistent fatigue, brain fog, low mood, weight gain or difficulty losing weight, weakness, tingling in the hands or feet, shortness of breath, and a weakened immune system
Serious allergic reactions are uncommon but require urgent care
You can inject your B12 shot directly with a syringe
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Systemic side effects include mild nausea, transient headache, dizziness, and increased heart rate in some patients