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Still, side effects from B12 supplements are possible, especially at higher doses, and include: Headache Nausea Vomiting Fatigue Weakness Diarrhea Tingling in the hands and feet Nasal spray Vitamin B12 is also available in a nasal spray
Diagnosing Vitamin B12 Deficiency What Are Normal B12 Levels
The B12 intravenous dose is usually the same as the intramuscular dose, from 1000 mcg to 2500 mcg per infusion
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