In addition to fatigue, a deficiency of B12 can lead to other symptoms like pale skin, headaches, depression, gastrointestinal problems, difficulty concentrating, decreased mental function, mouth and tongue pain or inflammation, and paresthesia in your hands and feet
You are likely to feel a pinch as the needle enters the skin
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While these trials reportedly showed safety with no observed toxicity, complete peer-reviewed data was never published, leaving only conference abstracts as documentation