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Side effects from B12 injections include: Dizziness Headache Nausea Diarrhoea Skin irritation Fatigue A tingling sensation in hands or feet
Neelakantan H, et al
B12 Deficiency and HbA1c: How It Affects Diabetes Testing B12 deficiency and HbA1c are closely linked in ways that can significantly affect the accuracy of diabetes diagnosis and monitoring
Too Much Vitamin B12: Risks, Symptoms and When to Seek Help Vitamin B12 (cobalamin) is a water-soluble vitamin crucial for nerve function, DNA synthesis, and red blood cell production
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